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DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUIT
PC1876
US MTS DECODER
DESCRIPTION
The PC1876 is an integrated circuit for US MTS (Multi Channel Television Sound) system. All functions for US MTS system are provided on one chip. The PC1876 has built-in SAP (Sub Audio Program) discrimination error protection circuit.
FEATURES
* BTSC (USA) standard demodulator (Stereo demodulation and TV-dbx noise reduction) * Only four adjustments (2 separation, 1 stereo VCO, 1 filter) * Supply voltage: 8 V to 10 V * Circuit current: 27 mA TYP. (Supply voltage: 9 V) * Input and output level (L+R, 100% modulation) Input level: 0.42 Vp-p Output level: 1.41 Vp-p
APPLICATION
* TV sets and VCRs for North America
ORDERING INFORMATION
Part Number Package 42-pin plastic SSOP (9.53 mm (375))
PC1876GT
The PC1876 is available only to licensees of THAT Corporation. Please contact: (03) 5790-5391 (Japan) (508) 229-2500 (USA)
The information in this document is subject to change without notice. Before using this document, please confirm that this is the latest version. Document No. S11666EJ4V0DS00 (4th edition) Date Published June 2000 N CP(K) Printed in Japan
The mark
shows major revised points.
(c)
1996
PC1876
SYSTEM BLOCK DIAGRAM (TV)
Tuner
PIF & SIF
Color, intensity and deflecting signal processor
Color output
CRT
Vertical output
DTS interface
PC1876
Dual attenuator/ Matrix surround processor
Sound output
Degital tuning controller
Remote control reception amplifier
PIN photo-diode
2
Data Sheet S11666EJ4V0DS00
PC1876
BLOCK DIAGRAM
VCC 1 k
VCC STL SAP1/2 ST/SAP MUTE FMONO 22 23 24 25 26 27 Mode Selector Offset Absorption WideBand RMS Filter LED Driver WideBand VCA 21 20 19 18 17 16 15 Spectral RMS 14 13 12 ST/SAP SW 32 33 34 35 1/2 36 37 38 39 40 41 42 1/4 Stereo VCO Pilot Discrimination Phase Comparator Stereo Phase Comparator Pilot Canceller Phase Detector SAP Detector 1/2 VCC Deemphasis SAP VCO SAP LPF L+R LPF Loop Filter Noise Detector Noise BPF 408 Hz LPF Variable Emphasis 2.19 kHz LPF 11 10 9 8 7 6 5 4 3 SAP BPF Stereo LPF
+ -
SAPL DCO
1 k VCC 20 k
LGND WTI STI 10 F + 3.3 F + 100 k 50 k
WideBand RMS
Note 1
IC
SPA 51 k WBA 51 k ITI
10 F ROT 28 + 10 F LOT 29 + 1 F + VOA GND MOA1 0.1 F MOA2 VRE + 1.5 V 33 k SAPVA FLTA STVA PD1 0.1 F PD2 30 31 Matrix
fH Trap LPF
Spectral RMS Filter
56 k 56 k
WRB 5.1 k + SRB 3 k + VCC WBVI VEO fHSW SI SOT NDT SDT SDI SBO COM + 2.2 F + 0.47 F 0.047 F 0.01 F 0.1 F 68 k 0.1 F 1 F
VCC 1 F
22 F
Note 2
L-R AM Demodulator
10 k 33 k 20 k 47 k
1 k 4.7 F +
D1
+ 1 F D2
2 1
Notes 1. Do not leave the Internally Connected (IC) pin open because it is a base-open pin. Connect this pin to VCC or GND. 2. Am: Amplitude modulation (Carrier frequency is 31.5 kHz (2fH)) Remark Use the following for external parts. Resistor () : Metal film resistor (1%). Unless otherwise specified; 5% Capacitors () : Tantalum capacitor (10%). Unless otherwise specified; 20% Variable resistors: 10%
Data Sheet S11666EJ4V0DS00
3
PC1876
PIN CONFIGURATION (Top View)
42-pin plastic SSOP (9.53 mm (375))
COMPOSITE SIGNAL INPUT SAP BPF OUTPUT SAP DISCRIMINATION FILTER INPUT SAP DISCRIMINATION FILTER NOISE DETECTION FILTER SAP SINGLE OUTPUT SAP SINGLE INPUT STEREO VCO FREE-RUN MONITOR SWITCH VARIABLE EMPHASIS OUTPUT WIDE-BAND VCA INPUT POWER SUPPLY (9 V) SPECTRAL RMS OFFSET ABSORPTION WIDE-BAND RMS OFFSET ABSORPTION TIMING CURRENT SETTING WIDE-BAND RMS SETTING SPECTRAL RMS SETTING SPECTRAL RMS TIMING WIDE-BAND RMS TIMING LED GND DC OUTPUT SAP LED DRIVER
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
COM SBO SDI SDT NDT SOT SI fHSW VEO WBVI VCC SRB WRB ITI WBA SPA STI WTI LGND DCO SAPL
D2 42 D1 41
PD2 PD1 STVA FLTA SAPVA 1.5 V VRE MOA2 MOA1 GND VOA LOT ROT IC FMONO MUTE ST/SAP SAP1/2 STL 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22
PHASE COMPARATOR FILTER 2 PHASE COMPARATOR FILTER 1 PILOT DISCRIMINATION FILTER 2 PILOT DISCRIMINATION FILTER 1 STEREO VCO SETTING FILTER ADJUSTMENT SAP VCO SETTING BIAS (1.5 V) 1/2 VCC FILTER MONAURAL OFFSET ABSORPTION 2 MONAURAL OFFSET ABSORPTION 1 SIGNAL GND VCA OFFSET ABSORPTION L CHANNEL OUTPUT R CHANNEL OUTPUT INTERNAL CONNECTION F-MONAURAL SELECTION MATRIX MUTE STEREO/SAP SWITCH SAP 1/2 SWITCH STEREO LED DRIVER/ STEREO VCO FREE-RUN MONITOR
4
Data Sheet S11666EJ4V0DS00
PC1876
CONTENTS
1. INTERNAL EQUIVALENT CIRCUITS ............................................................................................ 2. FUNCTION OF EACH BLOCK ..................................................................................................... 2.1 Stereo Demodulation Block ................................................................................................... 2.2 SAP Demodulation Block ....................................................................................................... 2.3 dbx Noise Reduction Block ................................................................................................... 2.4 Matrix Block ............................................................................................................................ 3. EXPLANATION OF EACH FUNCTION ........................................................................................ 3.1 Mode Matrix Table ................................................................................................................... 3.2 MATRIX MUTE Pin .................................................................................................................. 3.3 F-MONAURAL SELECTION Pin ............................................................................................. 3.4 STEREO/SAP SWITCH Pin ..................................................................................................... 3.5 SAP 1/2 SWITCH Pin ............................................................................................................... 4. PRECAUTIONS ............................................................................................................................... 4.1 Impedance of Input Pins and Output Pins ........................................................................... 4.2 Output Load Impedance ........................................................................................................ 4.3 Cautions on External Components ....................................................................................... 4.4 Change of Electrical Characteristics Depending on External Components ..................... 4.5 BIAS (1.5 V) Pin ....................................................................................................................... 5. ADJUSTMENT PROCEDURE ........................................................................................................ 5.1 Stereo VCO Adjustment ......................................................................................................... 5.2 Filter Adjustment .................................................................................................................... 5.3 Separation Adjustment .......................................................................................................... 5.4 SAP VCO Adjustment ............................................................................................................. 5.5 List of Pin Settings in Adjustment ........................................................................................
6 13 14 15 15 17 18 18 18 19 19 19 20 20 20 21 21 21 22 22 22 22 23 23
6. ELECTRICAL SPECIFICATIONS ................................................................................................... 24 7. MEASURING CIRCUIT ................................................................................................................... 35 8. DIFFERENCES BETWEEN THE PC1876GT AND PC1872GT ............................................. 36 9. PACKAGE DRAWING ..................................................................................................................... 37 10. RECOMMENDED SOLDERING CONDITIONS ............................................................................. 38
Data Sheet S11666EJ4V0DS00
5
PC1876
1. INTERNAL EQUIVALENT CIRCUITS
(1/7) Pin Number 1 Pin Name COMPOSITE SIGNAL INPUT Symbol COM Internal Equivalent Circuit
VCC VCC 80 k 1 5 k 5 pF 10 k 10 k
1 2
5 k
5 k GND
2
SAP BPF OUTPUT
SBO
VCC 2 k 10 k
2
5 k 2 k GND
3
SAP DISCRIMINATION FILTER INPUT
SDI
VCC VCC 10 k 40 k 10 k
1 2
5 k 3
10 pF
10 k GND
6
Data Sheet S11666EJ4V0DS00
PC1876
(2/7) Pin Number 4 Pin Name SAP DISCRIMINATION FILTER Symbol SDT Internal Equivalent Circuit
VCC 10 k 10 k 10 k 4 20 k
3 pF
5 k
39 k 13 k
20 k
20 k 10 k 10 k
10 k
5 k
10 k GND
5
NOISE DETECTION FILTER
NDT
20 k 20 k 5 20 k
VCC
20 k 20 k
20 k
20 k GND
6 7 8
SAP SINGLE OUTPUT SAP SINGLE INPUT STEREO VCO FREE-RUN MONITOR SWITCH
SOT SI fHSW
Same as SBO pin Same as COM pin
2 VCC VCC 1
5 k
20 k
20 k
60 k
10 k
8 GND
9
VARIABLE EMPHASIS OUTPUT WIDE-BAND VCA INPUT POWER SUPPLY (9 V)
VEO
Same as SBO pin
10 11
WBVI VCC
Same as COM pin
Data Sheet S11666EJ4V0DS00
7
PC1876
(3/7) Pin Number 12 Pin Name SPECTRAL RMS OFFSET ABSORPTION WIDE-BAND RMS OFFSET ABSORPTION Symbol SRB Internal Equivalent Circuit Pin 13 is the same as pin 12.
VCC 5 k
13
WRB
5 k
5 k
5 k 12
5 k GND
14 15 16
TIMING CURRENT SETTING WIDE-BAND RMS SETTING SPECTRAL RMS SETTING
ITI WBA SPA
Pin 16 is the same as pin 15.
VCC 10 k 10 k
5 k 5 k 10 k 10 10 k k 10 k 10 k 15 30 k GND
17 SPECTRAL RMS TIMING STI
VCC 5 k 600
10 k 14
5 k
5 k 5 k 17 5 k GND
18
WIDE-BAND RMS TIMING
WTI
Same as STI pin
8
Data Sheet S11666EJ4V0DS00
PC1876
(4/7) Pin Number 19 20 21 22 Pin Name LED GND DC OUTPUT SAP LED DRIVER STEREO LED DRIVER/ STEREO VCO FREE-RUN MONITOR Symbol LGND DCO SAPL Internal Equivalent Circuit
VCC 30 k 5 k 5 k 20
STL
10 k
1 k
1 k
22
21 10 k 5 k 5 k LGND
23
SAP1/2 SWITCH
SAP1/2
20 k
VCC
23
10 k
LGND
24 25
STEREO/SAP SWITCH MATRIX MUTE
ST/SAP MUTE
Same as SAP1/2 pin VCC 20 k 20 k
25 10 k
GND 26 27 F-MONAURAL SELECTION INTERNAL CONNECTION FMONO IC Same as MUTE pin Same as MUTE pinNote
Note Do not leave the Internally Connected (IC) pin open because it is a base-open pin. Connect this pin to VCC or GND.
Data Sheet S11666EJ4V0DS00
9
PC1876
(5/7) Pin Number 28 Pin Name R CHANNEL OUTPUT Symbol ROT
1 k 10 k
Internal Equivalent Circuit
VCC
200 28 200 5 k
5 k
5 k
1 k GND
29 30
L CHANNEL OUTPUT VCA OFFSET ABSORPTION
LOT VOA
Same as ROT pin VCC
1 2
VCC
10 k
10 k
10 k VCC 40 k 30 40 k 5 pF 5 k 10 k
10 k GND 31 32 SIGNAL GND MONAURAL OFFSET ABSORPTION 1 MONAURAL OFFSET ABSORPTION 2 1/2 VCC FILTER GND MOA1 Same as COM pin
33
MOA2
Same as SBO pin
34
VRE
VCC 10 k 10 k 5 k 20 k 34 20 k 20 k 10 k
10 k 20 k GND
10
Data Sheet S11666EJ4V0DS00
PC1876
(6/7) Pin Number 35 Pin Name BIAS (1.5 V) Symbol 1.5 V 20 k 20 k Internal Equivalent Circuit VCC
5 k 5 pF 2.5 k 5 k 35
12.5 k 25 k GND 36 37 SAP VCO SETTING FILTER ADJUSTMENT SAPVA FLTA 20 k 20 k 36 VCC 20 k 20 k
37 1 k
5 k 1 k GND
38
STEREO VCO SETTING
STVA VCC 10 k 10 k
20 pF 10 k 38 30 k GND 10 k 1 k
Data Sheet S11666EJ4V0DS00
11
PC1876
(7/7) Pin Number 39 40 Pin Name Symbol Internal Equivalent Circuit
PILOT DISCRIMINATION FILTER 1 PD1 PILOT DISCRIMINATION FILTER 2 PD2
VCC 39 15 k 15 k 5 k
1 2
VCC
VCC 40 15 k 15 k 5 k
41 42
PHASE COMPARATOR FILTER 1 PHASE COMPARATOR FILTER 2
D1 D2
41
VCC
15 k 5 k
5 k
1 2
VCC
VCC 15 k 42 5 k 5 k
12
Data Sheet S11666EJ4V0DS00
PC1876
2. FUNCTION OF EACH BLOCK
In the US, TV audio signals are broadcast in FM modulation. The stereo (L-R), Sub Audio Program (SAP) and telemetry signals are multiplexed in a higher frequency band than the monaural (L+R) signal (50 Hz to 15 kHz). The US MTS system base-band spectrum is described before: Figure 2-1. US MTS System Base-Band Spectrum
50
Stereo signal (L-R)
Audio carrier deviation (kHz)
Stereo pilot signal
Monaural signal (L+R) 25
15
Sub Audio Program (SAP) signal
5 3 0 fH (15.734 kHz) 2 fH 3 fH 4 fH 5 fH 6 fH
Telemetry signal 6.5 fH
Modulation frequency (Hz)
Table 2-1. US MTS System Base-Band Spectrum
Maximum audio carrier deviation (kHz) 25 Only stereo broadcasting AM modulation (carrier frequency 2 fH), dbx noise reduction processing FM modulation (carrier frequency 5 fH, maximum frequency deviation 10 kHz) dbx noise reduction processing FM modulation (carrier frequency 6.5 fH, maximum frequency deviation 3 kHz) 5 50
Signal frequency band Monaural signal (L+R) Stereo pilot signal Stereo signal (L-R) 50 Hz to 15 kHz 15.734 kHz 50 Hz to 15 kHz
Signal processing system
Sub Audio Program (SAP) signal
50 Hz to 10 kHz
15
Telemetry signal
Audio Data
0 to 3.4 kHz 0 to 1.5 kHz
3
Data Sheet S11666EJ4V0DS00
13
PC1876
2.1 Stereo Demodulation Block
(1) Stereo LPF Filter eliminates the Sub Audio Program (SAP) signal (5 fH) and telemetry signal (6.5 fH) residing anywhere around 5 to 6 fH. The internal L-R demodulator, which uses the double-balanced circuit, demodulates L-R signal by multiplication of L-R signal with the signal at L-R carrier frequency (2 fH). The L-R signal tends to be interfered by the 6 fH signal because a square waveform is used as the switching carrier in this method. To eliminate the interference, the PC1876 incorporates 5 fH and 6 fH traps. Adjust the current value output from the FLTA pin for the filter response. (2) Stereo phase comparator The 8 fH signal generated at the stereo VCO is divided by 8 (4 x 2) and then multiplies it with the pilot signal passed through the stereo LPF. The two signals differ from each other by 90 degrees in terms of phase. The resistor and capacitor connected to the D1 and D2 pins form a filter which smoothes the phase error signal output from the phase comparator, converting the error signal to the DC voltage. When the voltage difference between the D1 and D2 pins becomes 0 V (strictly speaking, not 0 V by the internal offset voltage), the stereo VCO runs at 8 fH. The lag/lead filter externally connected to the D1, D2 pins determines the capture range. (3) Stereo VCO Runs at 8 fH with the internal capacitor. Adjust the current value output from the STVA pin for the frequency. (4) Divider (Flip-flop) Produces the inphase fH signal and the fH signal which is different 90 degrees from the input pilot signal by dividing the 8 fH frequency by 4 x 2 from the stereo VCO. (5) Pilot discrimination phase comparator (Level detector) Multiplies the pilot signal from the COM pin with the inphase fH signal from the divider. The produced signal is applied to the external filter connected to the PD1, PD2 pins. The signal is smoothed out to make DC voltage for judging whether to turn on or off the stereo LED. (6) Pilot canceller The fH signal from the divider is added in the stereo signal at the resistor matrix depending on the level of the input pilot signal to cancel the pilot signal. (7) L+R LPF This LPF, having traps at fH and 24 kHz each, allows only the monaural signal to pass through. The filter response is adjusted by the current value output from the FLTA pin. (8) De-emphasis 75 s de-emphasis filter for the monaural signal. The filter response is adjusted by the current value output from the FLTA pin. (9) L-R AM demodulator Demodulates the L-R AM-DSB modulated signal by multiplying with the 2fH signal which is synchronized to the pilot signal. The 2 fH square wave is used as the switching carrier.
14
Data Sheet S11666EJ4V0DS00
PC1876
2.2 SAP Demodulation Block
(1) SAP BPF Picks up the SAP signal by the 50 kHz and 102 kHz traps, and response peak at 5 fH. Adjust the current value output from the FLTA pin for the filter response. (2) Noise BPF The PC1876 monitors signals picked up by noise BPF (fO 180 kHz), and distinguish noises from signals. By this method, the PC1876 prevents misoperating on SAP detection in a weak electric field. Adjust the current value output from the FLTA pin for the filter response. (3) Noise detector Performs full-wave rectification of noise which has passed through noise BPF to change it to the DC voltage and input it to comparator. When the noise level exceeds the reference level, the stereo LED and SAP LED are turned off, and the stereo and SAP demodulation are stopped. Adjust the value of the resistor and capacitor connected to the NDT pin for the sensitivity and time constant of the noise detection circuit. (4) SAP detector Performs synchronized detection of the SAP signal which has passed through the SAP BPF, and smoothes it with the SDT pin and input it to the comparator. When receiving the SAP signal, the SAP LED is turned on. (5) SAP demodulator The SAP demodulator consists of the phase detector, loop filter, and SAP VCO (PLL detection circuit). The SAP VCO oscillates at 10 fH, and performs phase comparison between the signal divided by 2 of the SAP VCO frequency and the SAP signal to make the PLL loop. Adjust the current value output from the SAPVA pin for the frequency of the SAP VCO. (6) SAP LPF Eliminates the SAP carrier and higher frequency buzz. The filter consists of a secondary LPF and fH trap filter. Adjust the current value output from the FLTA pin for the filter response.
2.3 dbx Noise Reduction Block
All the filters required for the TV-dbx noise reduction are incorporated. Adjust the current value output from the FLTA pin for these filter responses. (1) LPF The LPF has traps at fH and 24 kHz each. The fH trap filter minimizes interference to the dbx noise reduction by the fH signal which is not synchronized with the pilot signal (e.g. leakage of the synchronous idle and buzz from the video signal).
Data Sheet S11666EJ4V0DS00
15
PC1876
(2) 408 Hz LPF A de-emphasis filter. The transfer function is as follows:
1+ j f 5.23 k f 1+ j 408
T(f) =
(3) Variable emphasis Also called spectral VCA and controlled by the spectral RMS. The transfer function is as follows:
1+ j 1 + 51 b f 20.1 k b +1 1 + 51 f 1+ j 20.1 k b + 1
S -1
(f, b) =
b: Variable transferred from the spectral RMS for controlling (4) Wide band VCA A VCA whose operating frequency range is mainly low to mid frequencies and controlled by the wide band RMS. The transfer function is as follows: W-1 (a) = a a: Variable transferred from the wide-band RMS for controlling (5) 2.19 kHz LPF A de-emphasis filter. The transfer function is as follows:
f 6.25 k f 1+ j 2.19 k 1+ j
T(f) =
(6) Spectral RMS filter A filter that limits the band width of the signal input to the RMS which controls the variable emphasis. The transfer function is as follows:
f j 7.66 k 1+ j
2
T(f) =
f f + j 7.66 k 7.31 k
2
f 3.92 k f 1+ j 3.92 k j
(7) Wide-band RMS filter A filter that limits the band width of the signal input to the wide-band RMS which controls the wide band VCA. The transfer function is as follows:
T(f) = 1 1+ j f 2.09 k
16
Data Sheet S11666EJ4V0DS00
PC1876
(8) Spectral RMS Detects the RMS value of the signal which has passed through the spectral RMS filter and converts the signal to the DC voltage. The timing (release time) is determined by the current inside the PC1876 (IT) and the capacitance of the external capacitor connected to the STI pin. Set IT by the current value output from ITI pin. (9) Wide band RMS Detects the RMS value of the signal which has passed through the wide band RMS filter and converts the signal to the DC voltage. The timing (release time) is determined by the current inside the PC1876 (IT) and the capacitance of the external capacitor connected to the WTI pin. Set IT by the current value output from ITI pin for the setting of IT.
2.4 Matrix Block
(1) Matrix Adds L+R signal and L-R signal to output L signal and subtracts L+R signal from L-R signal to output R signal. (2) Mode selector Selects the user selected mode among the monaural, stereo, SAP signals, and mute, and outputs it from the ROT and LOT pins.
Data Sheet S11666EJ4V0DS00
17
PC1876
3. EXPLANATION OF EACH FUNCTION
Caution Apply bias voltage to the F-MONAURAL SELECTION pin, the MATRIX MUTE pin, the SAP 1/2 pin and the STEREO/SAP SWITCH pin. Don't leave those pins unconnected because those pins are base open. Loss current is 0.1 A or less. Mode matrix table is shown in 3.1, and functions of mode switch pins are explained in 3.2 to 3.5.
3.1 Mode Matrix Table
L, R SIGNAL OUTPUT pin matrix table
Control pin Broadcasting mode Monaural F-MONAURAL SELECTION - H Stereo M L STEREO/SAP SWITCH - - - - H H Monaural + SAP M L L - - H H Stereo + SAP M L L - - SAP1/2 SWITCH - - - - - H L - - - H L - - L+R L L+R SAP OFF ON OFF ON L H L+R R SAP ON ON H L+R SAP L+R L+R SAP OFF OFF ON L H ON H L Output LED ON/OFF SAP LED OFF DC OUTPUT L
L CHANNEL R CHANNEL STEREO OUTPUT OUTPUT LED L+R R OFF ON OFF ON
OFF
L
Remark When the noise detector detects noise, both the stereo and the SAP demodulation circuit stop. The noise detector of the PC1876 detects noise near 180 kHz that is 30 mVr.m.s. (TYP.) or higher.
3.2 MATRIX MUTE Pin
The MATRIX MUTE pin controls muting of each output pin at muting operation.
Input signal level of the MATRIX MUTE H L R CHANNEL OUTPUT L CHANNEL OUTPUT Mute is ON Mute is OFF SAP LED STEREO LED OFF ON
18
Data Sheet S11666EJ4V0DS00
PC1876
3.3 F-MONAURAL SELECTION Pin
When the F-MONAURAL SELECTION is ON, the R CHANNEL OUTPUT and L CHANNEL OUTPUT output monaural (L+R) signal regardless of broadcasting mode. The PC1876 varies in pin function of the F-MONAURAL SELECTION.
Output pin Input signal level of the F-MONAURAL SELECTION H M L ON
R CHANNEL OUTPUT L CHANNEL OUTPUT OFF
3.4 STEREO/SAP SWITCH Pin
Selecton pin of the L CHANNEL OUTPUT and R CHANNEL OUTPUT (Stereo signal/SAP signal).
Output pin Input signal level of the STEREO/SAP SWITCH H L
R CHANNEL OUTPUT L CHANNEL OUTPUT Stereo signal SAP signal
3.5 SAP 1/2 SWITCH Pin
Selection pin of the L CHANNEL OUTPUT and R CHANNEL OUTPUT (SAP 1 mode/SAP 2 mode) when the STEREO/SAP SWITCH is L level (SAP signal is selected).
Input signal level of the SAP 1/2 SWITCH H L
Mode SAP2 SAP1
L CHANNEL OUTPUT R CHANNEL OUTPUT L + R signal SAP signal SAP signal
Data Sheet S11666EJ4V0DS00
19
PC1876
4. PRECAUTIONS 4.1 Impedance of Input Pins and Output Pins
Each impedance of input and output pins are the following.
Pin name Input COMPOSITE SIGNAL INPUT SAP DISCRIMINATION FILTER INPUT SAP SINGLE INPUT WIDE BAND VCA INPUT MONAURAL OFFSET ABSORPTION 1 Output SAP BPF OUTPUT SAP SINGLE OUTPUT VARIABLE EMPHASIS OUTPUT MONAURAL OFFSET ABSORPTION 2 R CHANNEL OUTPUT L CHANNEL OUTPUT Impedance 80 k 40 k 80 k 80 k 80 k 360 360 360 360 15 15
Scattering rate of impedance is about 30%.
4.2 Output Load Impedance
If the L CHANNEL OUTPUT pin and the R CHANNEL OUTPUT pin are connected to GND through 10 k resistor, they can drive 700 load impedance. And, when connecting a load capacitance over 100 pF to the L/R CHANNEL OUTPUT pins, parasitic oscillation can cause. In this case, insert a resistor between the L/R CHANNEL OUTPUT pins and the load capacitance. Note that the load capacitance changes by printed-wiring pattern of set. Caution To insert the DC load resistor (RL) between the L/R CHANNEL OUTPUT pins and GND, the RL should be equal or more than 3 k. Note that the DC current increments 4.5/RL [A] per one output pin when inserting the RL, because the medium potential is 4.5 V (VCC = 9 V). If the RL is less than 3 k, the distortion rate may become worse extremely.
20
Data Sheet S11666EJ4V0DS00
PC1876
4.3 Cautions on External Components
For stable temperature characteristics of stereo VCO, SAP VCO and filter, use the following for external components.
Pin name SAP VCO SETTING FILTER ADJUSTMENT STEREO VCO SETTING External parts Metal film resistor (1%), Cermet (Variable resistor) (10%)
According to the license contract with THAT Corporation, use the following for external components. With regard to the use of other external components, please contact to THAT Corporation.
Pin name TIMING CURRENT SETTING WIDE BAND RMS TIMING SPECTRAL RMS TIMING External parts Metal film resistor (1%) Tantalum capacitor (10%)
4.4 Change of Electrical Characteristics Depending on External Components
* SAP sensitivity can be down by inserting a resistor between the SAP DISCRIMINATION FILTER pin and GND. * Stereo sensitivity can be down by inserting a resistor between the STEREO VCO FREE-RUN MONITOR SWITCH pin and GND. * Noise sensitivity can be changed by changing a resistor between the NOISE DETECTION FILTER pin and GND. * Capture range can be changed by changing capacitor between the PHASE COMPARATOR FILTER pins D1 and
D2. The smaller capacitor is, the wider capture range is, and the larger capacitor is, the narrower capture range
is. Please be careful because stereo distortion rate become worse if capacitor is too small. * In case noise detection circuit doesn't operate with stereo, it is necessary that capacitor between the PILOT DISCRIMINATION FILTER pins is about 2.2 F (Protection for miss operation in the weak electric field). The time for changing to stereo, become longer if capacitor is too large.
4.5 BIAS (1.5 V) Pin
The BIAS (1.5 V) pin is the bias pin when adjusting the SAP VCO SETTING, the FILTER ADJUSTMENT, the STEREO VCO SETTING, the WIDE BAND RMS SETTING, and the SPECTRAL RMS SETTING pins with lasertrimming.
Data Sheet S11666EJ4V0DS00
21
PC1876
5. ADJUSTMENT PROCEDURE
Precise alignment of the dbx decoder is absolutely critical for optimum performance. Where possible, the alignment should be performed after the PC1876 is mounted in the chassis and with the video system active.
5.1 Stereo VCO Adjustment
Perform this adjustment with no signal applied. (1) Set the STEREO VCO FREE-RUN MONITOR SWITCH pin "H" by connecting it to the VCC. (2) Measure the frequency of the STEREO LED DRIVER/STEREO VCO FREE-RUN MONITOR pin with a frequency counter, and adjust the variable resistor connected to the STEREO VCO SETTING pin for a measured frequency of 15.734 kHz 50 Hz. (3) Set the STEREO VCO FREE-RUN MONITOR SWITCH pin unconnected.
5.2 Filter Adjustment
Perform this adjustment with the MATRIX MUTE pin "L" and the STEREO VCO FREE-RUN MONITOR SWITCH pin unconnected. (1) Short the capacitor across the PILOT DISCRIMINATION FILTER (PD1 and PD2) pins by connecting these pins together directly. (2) Apply a 15.734 kHz sin wave signal to the COMPOSITE SIGNAL INPUT pin at a level greater than 30 mVr.m.s. (100 mVr.m.s. is recommended). (3) Adjust the variable resistor connected to the FILTER ADJUSTMENT pin so that the AC output level at the RMS OFFSET ABSORPTION pin is minimized. This signal is best monitored through a band-pass filter (15.734 kHz). A recommended circuit is shown in 7. MEASURING CIRCUIT. (4) Disconnect the short circuit across the PILOT DISCRIMINATION FILTER (PD1 and PD2) pins after adjustment.
5.3 Separation Adjustment
Perform this adjustment with the MATRIX MUTE pin "L", the STEREO VCO FREE-RUN MONITOR SWITCH pin unconnected, and the F-MONAURAL SELECTION pin "H". Verify that a L+R signal (100% modulation, 300 Hz, without noise reduction, pilot signal off) results in approximately 150 mVr.m.s. at the COMPOSITE SIGNAL INPUT pin, and that a pilot-only signal results in approximately 30 mVr.m.s. at the COMPOSITE SIGNAL INPUT pin. (1) Apply a composite signal (30% modulation, 300 Hz, L-only, with noise reduction) to the COMPOSITE SIGNAL INPUT pin. (2) Adjust the variable resistor connected to the WIDE-BAND RMS SETTING pin so that the output at the R CHANNEL OUTPUT pin is minimized. (3) Apply a composite signal (30% modulation, 3 kHz, L-only, with noise reduction) to the COMPOSITE SIGNAL INPUT pin. (4) Adjust the variable resistor connected to the SPECTRAL RMS SETTING pin so that the output at the R CHANNEL OUTPUT pin is minimized. (5) Repeat steps (1) and (2). Caution Be sure to perform step (5).
22
Data Sheet S11666EJ4V0DS00
PC1876
5.4 SAP VCO Adjustment
Perform this adjustment with the filter unless otherwise recommended. Be sure to adjust SAP VCO after 5.2. Filter adjustment. Usually, the filter and SAP VCO are adjusted simultaneously. For this reason, when this adjustment is performed, the applications of the SAP VCO SETTING pin and the FILTER ADJUSTMENT pin are modified to add variable resistor. (1) Input no signal to the COMPOSITE SIGNAL INPUT pin and measure the DC voltage of the SAP SINGLE OUTPUT pin. (2) Input SAP signal (5 fH, no modulation) to the COMPOSITE SIGNAL INPUT pin. Adjust the variable resistor connected to the SAP VCO SETTING pin so that the DC voltage of the SAP SINGLE OUTPUT pin may match with the DC voltage measured in step (1).
5.5 List of Pin Settings in Adjustment
Pin Name Adjustment Stereo VCO Adjustment Filter Adjustment Separation Adjustment SAP VCO Adjustment SAP1/2 - - - - ST/SAP - - - - MUTE - L (OFF) L (OFF) L (OFF) FMONO - - H (OFF) -
Remark -: Don't care.
Data Sheet S11666EJ4V0DS00
23
PC1876
6. ELECTRICAL SPECIFICATIONS
Absolute Maximum Ratings (TA = +25C)
Parameter Supply voltage LED driver current Control pin voltage Symbol VCC ID Vcont Current fed into SAPL and STL pins Voltage applied to fHSW, SAP1/2, ST/SAP, MUTE and FMONO pins Voltage applied to COM pin TA = 75C, in using the Universal (10 x 10 cm2) Glass Epoxy Board VCC = 9 V Conditions Ratings 11 30 VCC + 0.2 Unit V mA V
Input signal voltage Power dissipation
Vin PD
VCC 500
V mW
Operating ambient temperature Storage temperature
TA Tstg
-20 to +75 -40 to +125
C C
Caution If any of the parameters exceeds the absolute maximum ratings, even momentarily, the device reliability may be impaired. The absolute maximum ratings are values that may physically damage the product. Be sure to use the product within the ratings. Recommended Operating Conditions
Parameter Supply voltage LED driver current Output load impedance 1 Symbol VCC ID RL1 Current fed into SAPL and STL pins A.C. load impedance which can drive output from ROT and LOT pins. (at 100% modulation) A.C. load impedance which can drive output from SOT pin. (at 100% modulation) Signal voltage applied to COM pin L + R signal (100% modulation) L - R signal (100% modulation) Pilot signal SAP signal Control pin voltage 1 (High) Control pin voltage 1 (Low) Control pin voltage 2 (High) Control pin voltage 2 (Mid.) Control pin voltage 2 (Low) VcontH1 VcontL1 VcontH2 VcontM2 VcontL2 FMONO pin SAP1/2, ST/SAP and MUTE pins 3.5 0 3.5 1.5 0 2 Conditions MIN. 8.0 TYP. 9.0 MAX. 10.0 25 Unit V mA k
Output load impedance 2
RL2
10
k
Input signal voltage
Vin
0.424
Vp-p
0.848
Vp-p
0.0848 0.254 VCC 0.8 VCC 2.5 0.8
Vp-p Vp-p V V V V V
24
Data Sheet S11666EJ4V0DS00
PC1876
Electrical Characteristics (TA = +25C, RH 70%, VCC = 9.0 V unless otherwise specified)
(1/2) Parameter Supply current Stereo detection input sensitivity Stereo detection hysteresis Stereo detection capture range Symbol ICC STSENSE STHY CCH CCL SAP detection input sensitivity SAPSENSE No signal f = 15.734 kHz, sine wave Input stereo pilot signal only Vin = 30 mVr.m.s. Input stereo pilot signal only f = 78.67 kHz, 0% modulation Input SAP carrier only f = 78.67 kHz, 0% modulation Input SAP carrier only Input sine wave Frequency: noise BPF peak point Input sine wave Frequency: noise BPF peak point f = 300 Hz, 100% modulation f = 300 Hz, 100% modulation f = 300 Hz, 100% modulation f = 300 Hz, 100% modulation Noise reduction : OFF f = 300 Hz, 100% modulation Test conditions MIN. 19 9 5.0 2.5 -5.5 17 TYP. 27 13 7.5 4.0 -4.0 23 MAX. 38 18 10.0 5.5 -2.5 30 Unit mA mVr.m.s. dB % % mVr.m.s.
SAP detection hysteresis
SAPHY
3.3
4.8
6.3
dB
Noise detection input sensitivity
NOSENSE
21
30
40
mVr.m.s.
Noise detection hysteresis
NOHY
1.0
2.0
3.0
dB
Monaural total output voltage Stereo total output voltage SAP total output voltage SAP single output voltage
VOMO VOST VOSAP1 VOSAP2
450 450 400 450
500 500 500 500
550 550 600 550
mVr.m.s. mVr.m.s. mVr.m.s. mVr.m.s.
Difference between monaural L and R output voltage Monaural total frequency characteristics 1 Monaural total frequency characteristics 2 Monaural total frequency characteristics 3 Monaural total frequency characteristics 4 Stereo total frequency characteristics 1 Stereo total frequency characteristics 2 Stereo total frequency characteristics 3 Stereo total frequency characteristics 4 SAP total frequency characteristics 1 SAP total frequency characteristics 2 SAP total frequency characteristics 3
VOLR
-0.5
0
+0.5
dB
VOMO1
f = 1 kHz, 30% modulation (f = 300 Hz : 0 dB) f = 3 kHz, 30% modulation (f = 300 Hz : 0 dB) f = 8 kHz, 30% modulation (f = 300 Hz : 0 dB) f = 12 kHz, 30% modulation (f = 300 Hz : 0 dB) f = 1 kHz, 30% modulation (f = 300 Hz : 0 dB) f = 3 kHz, 30% modulation (f = 300 Hz : 0 dB) f = 8 kHz, 30% modulation (f = 300 Hz : 0 dB) f = 12 kHz, 30% modulation (f = 300 Hz : 0 dB) f = 1 kHz, 30% modulation (f = 300 Hz : 0 dB) f = 3 kHz, 30% modulation (f = 300 Hz : 0 dB) f = 8 kHz, 30% modulation (f = 300 Hz : 0 dB)
-0.5
0
+0.5
dB
VOMO2
-0.5
0
+0.5
dB
VOMO3
-0.8
0
+0.8
dB
VOMO4
-3.0
-1.5
-0.5
dB
VOST1
-0.5
0
+0.5
dB
VOST2
-0.5
0
+0.5
dB
VOST3
-1.7
-0.8
+0.1
dB
VOST4
-6.0
-4.0
-2.5
dB
VOSAP11
-1.2
+0.3
+1.2
dB
VOSAP12
-0.6
+0.5
+1.6
dB
VOSAP13
-2.5
-0.5
+1.5
dB
Data Sheet S11666EJ4V0DS00
25
PC1876
(2/2) Parameter SAP single frequency characteristics 1 Symbol VOSAP21 Test conditions f = 1 kHz, 30% modulation (f = 300 Hz : 0 dB) Noise reduction : OFF f = 3 kHz, 30% modulation (f = 300 Hz : 0 dB) Noise reduction : OFF f = 8 kHz, 30% modulation (f = 300 Hz : 0 dB) Noise reduction : OFF f = 300 Hz, 30% modulation f = 1 kHz, 30% modulation f = 3 kHz, 30% modulation f = 1 kHz, 100% modulation f = 1 kHz, 100% modulation f = 8 kHz, 30% modulation f = 1 kHz, 100% modulation f = 1 kHz, 100% modulation, Noise reduction : OFF SAP: f = 3 kHz, 30% modulation Stereo: L-only, f = 800 Hz, 30% modulation SAP: f = 800 Hz, 30% modulation Stereo: L-only, f = 3 kHz, 30% modulation f = 1 kHz, 100% modulation ID = 10 mA Current flowing into STI, WTI pins Mute Monaural No signals Mute Stereo Input pilot signal only Mute SAP1 Input 5fH signal only f = 300 Hz, 100% modulation Pre-emphasis : ON f = 300 Hz, 100% modulation Noise reduction : ON 1.5 V pin DCO pin, I = 1 mA MIN. -0.5 TYP. 0 MAX. +0.5 Unit dB
SAP single frequency characteristics 2
VOSAP22
-0.5
0
+0.5
dB
SAP single frequency characteristics 3
VOSAP23
-1.0
0
+1.0
dB
Stereo channel separation 1 Stereo channel separation 2 Stereo channel separation 3 Monaural total distortion rate Stereo total distortion rate 1 Stereo total distortion rate 2 SAP total distortion rate SAP single distortion rate
Sep1 Sep2 Sep3 THDMO THDST1 THDST2 THDSAP1 THDSAP2
27 25 27 - - - - -
32 30 35 0.1 0.3 0.8 0.5 0.7
- - - 0.5 1.5 1.8 2.0 2.0
dB dB dB % % % % %
Cross talk 1 SAP stereo
CT1
-
-60
-50
dB
Cross talk 2 stereo SAP
CT2
-
-60
-50
dB
Total muting level LED driver saturation voltage dbx timing current Inter-mode DC offset 1
Mute VOSAT IT VDOF1
60 - 7.1 -50
70 0.1 7.5 0
- 0.3 7.9 +50
dB V
A
mV
Inter-mode DC offset 2
VDOF2
-50
0
+50
mV
Inter-mode DC offset 3
VDOF3
-50
0
+50
mV
Monaural total S/N
S/NMO
65
68
-
dB
Stereo total S/N SAP total S/N Reference voltage DC output saturation voltage
S/NST S/NSAP Vref VOSAT2
65 70 1.35 -
68 80 1.50 0.1
- - 1.65 0.3
dB dB V V
26
Data Sheet S11666EJ4V0DS00
PC1876
Electrical Characteristics Measurement List (TA = +25C, RH 70%, VCC = 9.0 V)
(1/6) Parameter Supply current Stereo detection input sensitivity Stereo detection hysteresis Symbol ICC STSENSE Current flowing to VCC pin (no signal). Input signal (f = 15.734 kHz) to COM pin. Raise input voltage gradually until stereo LED turns ON. Then measure input voltage of COM pin. Input signal (f = 15.734 kHz) to COM pin for stereo LED to be ON. Lower input voltage gradually until stereo LED turns OFF. Then assume input voltage "V". STSENSE STHY = 20 log V Input signal (f = 14.5 kHz, Vin = 0.0848 Vp-p [30 mVr.m.s.]) to COM pin. Raise input frequency gradually until stereo LED turns ON. Then assume input frequency "fin1". 15.734 [kHz] - fin1 CC = 15.734 [kHz] Next, input signal (f = 17.0 kHz, Vin = 0.0848 Vp-p [30 mVr.m.s.]) to COM pin. Lower input frequency gradually until stereo LED turns ON. Then assume input frequency "fin2". fin2 - 15.734 [kHz] CC = 15.734 [kHz] Input signal (f = 78.67 kHz, no modulation) to COM pin. Raise input voltage gradually until SAP LED turns ON. Then measure input volage of COM pin. SAPHY Input signal (f = 78.67 kHz, no modulation) to COM pin for SAP LED to be ON. Lower input voltage gradually until SAP LED turns OFF. Then assume input voltage "V". SAPSENSE SAPHY = 20 log V Apply 6.0 V to SDT pin. Input signal (f = 160 kHz, Vin = 10 mVr.m.s.) to COM pin. Raise frequency and measure the DC voltage of NDT pin. At maximum voltage, raise input voltage gradually until SAP LED turns OFF. Then measure input voltage of COM pin. Apply 6.0 V to SDT pin. Input signal (f = 160 kHz, Vin = 90 mVr.m.s.) to COM pin. Raise frequency and measure the DC voltage of NDT pin. At maximum voltage, lower input voltage gradually until SAP LED turns ON. Then assume input voltage of COM pin "V". NOSENSE NOHY = 20 log V Set MUTE and FMONO pins to "L". Input monaural signal (100% modulation, f = 300 Hz) to COM pin. Measure output voltage of ROT pin. Execute the same operation for LOT pin. Set ST/SAP and FMONO pins to "H" and MUTE pin to "L". Input L-only signal (100% modulation, f = 300 Hz) to COM pin. Measure output voltage of LOT pin. Execute the same operation for ROT pin (R-only signal). Set FMONO pin to "H" and SAP1/2, ST/SAP, MUTE pins to "L". Input SAP signal (100% modulation, f = 300 Hz) to COM pin. Measure output voltage of ROT pin. Execute the same operation for LOT pin. Set FMONO pin to "H" and SAP1/2, ST/SAP, MUTE pins to "L". Input SAP signal (100% modulation, f = 300 Hz) to COM pin. Measure output voltage of SOT pin. (Noise reduction : OFF) Measurement
STHY
Stereo detection capture range
CC
SAP detection input sensitivity SAP detection hysteresis
SAPSENSE
Noise detection input sesitivity
NOSENSE
Noise detection hysteresis
NOHY
Monaural total output voltage
VOMO
Stereo total output voltage
VOST
SAP total output voltage
VOSAP1
SAP single output voltage
VOSAP2
Data Sheet S11666EJ4V0DS00
27
PC1876
(2/6) Parameter Difference between monaural L and R output voltage Symbol VOLR Measurement Set MUTE and FMONO pin to "L". Input monaural signal (100% modulation, f = 300 Hz) to COM pin. Measure output voltage of ROT and LOT pin. Assume the output voltage of ROT pin "VROT" and the output voltage of LOT pin "VLOT". VROT VOLR = 20 log VLOT Set MUTE and FMONO pins to "L". Input monaural signal (30% modulation, f = 300 Hz) to COM pin. Assume output voltage of ROT pin "V300(MO)". Input monaural signal (30% modulation, f = 1 kHz) to COM pin. Assume output voltage of ROT pin "V1k(MO)". V1k(MO) VOMO1 = 20 log V300(MO) Execute the same operation for LOT pin. Set MUTE and FMONO pins to "L". Input monaural signal (30% modulation, f = 300 Hz) to COM pin. Assume output voltage of ROT pin "V300(MO)". Input monaural signal (30% modulation, f = 3 kHz) to COM pin. Assume output voltage of ROT pin "V3k(MO)". V3k(MO) VOMO2 = 20 log V300(MO) Execute the same operation for LOT pin. Set MUTE and FMONO pins to "L". Input monaural signal (30% modulation, f = 300 Hz) to COM pin. Assume output voltage of ROT pin "V300(MO)". Input monaural signal (30% modulation, f = 8 kHz) to COM pin. Assume output voltage of ROT pin "V8k(MO)". V8k(MO) VOMO3 = 20 log V300(MO) Execute the same operation for LOT pin. Set MUTE and FMONO pins to "L". Input monaural signal (30% modulation, f = 300 Hz) to COM pin. Assume output voltage of ROT pin "V300(MO)". Input monaural signal (30% modulation, f = 12 kHz) to COM pin. Assume output voltage of ROT pin "V12k(MO)". V12k(MO) VOMO4 = 20 log V300(MO) Execute the same operation for LOT pin. Set ST/SAP, FMONO pins to "H" and MUTE pin to "L". Input L-only signal (30% modulation, f = 300 Hz) to COM pin. Assume output voltage of LOT pin "V300(ST)". Input L-only signal (30% modulation, f = 1 kHz) to COM pin. Assume output voltage of LOT pin "V1k(ST)". V1k(ST) VOST1 = 20 log V300(ST) Execute the same operation for ROT pin (R-only signal). Set ST/SAP, FMONO pins to "H" and MUTE pin to "L". Input L-only signal (30% modulation, f = 300 Hz) to COM pin. Assume output voltage of LOT pin "V300(ST)". Input L-only signal (30% modulation, f = 3 kHz) to COM pin. Assume output voltage of LOT pin "V3k(ST)". V3k(ST) VOST2 = 20 log V300(ST) Execute the same operation for ROT pin (R-only signal).
Monaural total frequency characteristics 1
VOMO1
Monaural total frequency characteristics 2
VOMO2
Monaural total frequency characteristics 3
VOMO3
Monaural total frequency characteristics 4
VOMO4
Stereo total frequency characteristics 1
VOST1
Stereo total frequency characteristics 2
VOST2
28
Data Sheet S11666EJ4V0DS00
PC1876
(3/6) Parameter Stereo total frequency characteristics 3 Symbol VOST3 Measurement Set ST/SAP, FMONO pins to "H" and MUTE pin to "L". Input L-only signal (30% modulation, f = 300 Hz) to COM pin. Assume output voltage of LOT pin "V300(ST)". Input L-only signal (30% modulation, f = 8 kHz) to COM pin. Assume output voltage of LOT pin "V8k(ST)". V8k(ST) VOST3 = 20 log V300(ST) Execute the same operation for ROT pin (R-only signal). Set ST/SAP, FMONO pins to "H" and MUTE pin to "L". Input L-only signal (30% modulation, f = 300 Hz) to COM pin. Assume output voltage of LOT pin "V300(ST)". Input L-only signal (30% modulation, f = 12 kHz) to COM pin. Assume output voltage of LOT pin "V12k(ST)". V12k(ST) VOST4 = 20 log V300(ST) Execute the same operation for ROT pin (R-only signal). Set FMONO pin to "H" and SAP1/2, ST/SAP, MUTE pins to "L". Input SAP signal (30% modulation, f = 300 Hz) to COM pin. Assume output voltage of LOT pin "V300(SAP)". Input SAP signal (30% modulation, f = 1 kHz) to COM pin. Assume output voltage of LOT pin "V1k(SAP)". V1k(SAP) VOSAP11 = 20 log V300(SAP) Execute the same operation for ROT pin. SAP total frequency characteristics 2 VOSAP12 Set FMONO pin to "H" and SAP1/2, ST/SAP, MUTE pins to "L". Input SAP signal (30% modulation, f = 300 Hz) to COM pin. Assume output voltage of LOT pin "V300(SAP)". Input SAP signal (30% modulation, f = 3 kHz) to COM pin. Assume output voltage of LOT pin "V3k(SAP)". V3k(SAP) VOSAP12 = 20 log V300(SAP) Execute the same operation for ROT pin. Set FMONO pin to "H" and SAP1/2, ST/SAP, MUTE pins to "L". Input SAP signal (30% modulation, f = 300 Hz) to COM pin. Assume output voltage of LOT pin "V300(SAP)". Input SAP signal (30% modulation, f = 8 kHz) to COM pin. Assume output voltage of LOT pin "V8k(SAP)". V8k(SAP) VOSAP13 = 20 log V300(SAP) Execute the same operation for ROT pin. Input SAP signal (30% modulation, f = 300 Hz) to COM pin. Assume output voltage of SOT pin "V300(SAP)". Input SAP signal (30% modulation, f = 1 kHz) to COM pin. Assume output voltage of SOT pin "V1k(SAP)". V1k(SAP) VOSAP21 = 20 log V300(SAP) (Noise reduction OFF)
Stereo total frequency characteristics 4
VOST4
SAP total frequency characteristics 1
VOSAP11
SAP total frequency characteristics 3
VOSAP13
SAP single frequency characteristics 1
VOSAP21
Data Sheet S11666EJ4V0DS00
29
PC1876
(4/6) Parameter SAP single frequency characteristics 2 Symbol VOSAP22 Measurement Input SAP signal (30% modulation, f = 300 Hz) to COM pin. Assume output voltage of SOT pin "V300(SAP)". Input SAP signal (30% modulation, f = 3 kHz) to COM pin. Assume output voltage of SOT pin "V3k(SAP)". V3k(SAP) VOSAP22 = 20 log V300(SAP) (Noise reduction OFF) Input SAP signal (30% modulation, f = 300 Hz) to COM pin. Assume output voltage of SOT pin "V300(SAP)". Input SAP signal (30% modulation, f = 8 kHz) to COM pin. Assume output voltage of SOT pin "V8k(SAP)". V8k(SAP) VOSAP23 = 20 log V300(SAP) (Noise reduction OFF) Set ST/SAP, FMONO pins to "H" and MUTE pin to "L". Input L-only signal (30% modulation, f = 300 Hz) to COM pin. Assume output voltage of ROT pin "VROT" and output voltage of LOT pin "VLOT". VLOT VROT Execute the same operation for R-only signal. (Sound multiplex signal generator: 465Z (manufactured by EIDEN Co. Ltd.)) Sep1 = 20 log Stereo channel separation 2 Sep2 Set ST/SAP, FMONO pins to "H" and MUTE pin to "L". Input L-only signal (30% modulation, f = 1 kHz) to COM pin. Assume output voltage of ROT pin "VROT" and output voltage of LOT pin "VLOT". VLOT Sep2 = 20 log VROT Execute the same operation for R-only signal. (Sound multiplex signal generator: 465Z (manufactured by EIDEN Co. Ltd.)) Set ST/SAP, FMONO pins to "H" and MUTE pin to "L". Input L-only signal (30% modulation, f = 3 kHz) to COM pin. Assume output voltage of ROT pin "VROT" and output voltage of LOT pin "VLOT". VLOT Sep3 = 20 log VROT Execute the same operation for R-only signal. (Sound multiplex signal generator: 465Z (manufactured by EIDEN Co. Ltd.)) Set MUTE and FMONO pins to "L". Input monaural signal (100% modulation, f = 1 kHz) to COM pin. Measure output distortion rate of ROT and LOT pin. Set ST/SAP, FMONO pins to "H" and MUTE pin to "L". Input L-only signal (100% modulation, f = 1 kHz) to COM pin. Measure output distortion rate of LOT pin. Execute the same operation for R-only signal (ROT pin). Set ST/SAP, FMONO pins to "H" and MUTE pin to "L". Input L-only signal (100% modulation, f = 8 kHz) to COM pin. Measure output distortion rate of LOT pin. Execute the same operation for R-only signal (ROT pin). Set FMONO pin to "H" and SAP1/2, ST/SAP, MUTE pins to "L". Input SAP signal (100% modulation, f = 1 kHz) to COM pin. Measure output distortion rate of ROT and LOT pin.
SAP single frequency characteristics 3
VOSAP23
Stereo channel separation 1
Sep1
Stereo channel separation 3
Sep3
Monaural total distortion rate
THDMO
Stereo total distortion rate 1
THDST1
Stereo total distortion rate 2
THDST2
SAP total distortion rate
THDSAP1
30
Data Sheet S11666EJ4V0DS00
PC1876
(5/6) Parameter SAP single distortion rate Symbol THDSAP2 Measurement Set FMONO pin to "H" and SAP1/2, ST/SAP, MUTE pins to "L". Input SAP signal (100% modulation, f = 1 kHz) to COM pin. Measure output distortion rate of SOT pin. (nosie reduction OFF) Set ST/SAP, FMONO pins to "H" and MUTE pin to "L". Input L-only signal (f = 800 Hz, 30% modulation) and SAP signal (f = 3 kHz, 30% modulation) to COM pin. Assume output voltage of the LOT pin "VLOT". Connect LOT pin to 3 kHz BPF (gain = 0 dB at f = 3 kHz, -80 dB or more at f = 800 Hz) to LOT pin. Assume output voltage of BPF "VLOTCT1". VLOTCT1 CT1 = 20 log VLOT Set SAP1/2, ST/SAP pins to "L" and FMONO pin to "H". Input L-only signal (f = 3 kHz, 30% modulation) and SAP signal (f = 800 Hz, 30% modulation) to COM pin. Assume output voltage of the LOT pin "VLOT". Connect LOT pin to 3 kHz BPF (gain = 0 dB at f = 3 kHz, -80 dB or more at f = 800 Hz) to LOT pin. Assume output voltage of BPF "VLOTCT2". VLOTCT2 CT2 = 20 log VLOT Set MUTE and FMONO pins to "L". Input monaural signal (100% modulation, f = 1 kHz) to COM pin. Assume output voltage of ROT pin "VOMO". Set FMONO pin to "H". Assume output voltage of ROT pin "VMUTE". VOMO Mute = 20 log VMUTE Execute the same operation for LOT and NOT pins. Apply current (10 mA) to SAPL, STL pins, and measure input voltage of the pin.
Cross talk 1 SAP stereo
CT1
Cross talk 2 stereo SAP
CT2
Total muting level
Mute
LED driver saturation voltage dbx timing current Inter-mode DC offset 1 mute monaural
VOSAT
IT VDOF1
Input DC voltage (6 V) to STI and WTI pins, and measure current of the pin. Set FMONO pin to "L". Apply DC 1 V to fHSW pin and DC 6 V to SDT pin. Set MUTE pin to "H". Assume output voltage of ROT pin "VMU". Next, input no signal to COM pin to change MUTE pin to "L". Assume output voltage of ROT pin "VMO". VDOF1 = VMO - VMU Execute the same operation for LOT pin.
Inter-mode DC offset 2 mute stereo
VDOF2
Set ST/SAP, FMONO pins to "H". Apply DC 1 V to fHSW pin and DC 6 V to SDT pin. Set MUTE pin to "H". Assume output voltage of ROT pin "VMU". Next, input pilot signal to COM pin to change MUTE pin to "L". Assume output voltage of ROT pin "VST". VDOF2 = VST - VMU Execute the same operation for LOT pin. Set FMONO pin to "H" and SAP1/2, ST/SAP pins "L". Apply DC 1 V to fHSW pin and DC 6 V to SDT pin. Set MUTE pin to "H". Assume output voltage of ROT pin "VMU". Next, input 5fH signal to COM pin to change MUTE pin to "L". Assume output voltage of ROT pin "VSAP". VDOF3 = VSAP - VMU Execute the same operation for LOT pin.
Inter-mode DC offset 3 mute SAP
VDOF3
Data Sheet S11666EJ4V0DS00
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PC1876
(6/6) Parameter Monaural total S/N Symbol S/NMO Measurement Set MUTE and FMONO pins to "L". Input no signal to COM pin, and assume output voltage of ROT pin "VNMO". Input monaural signal (100% modulation, f = 300 Hz) to COM pin, and assume output voltage of ROT pin "VSMO". VSMO S/NMO = 20 log VNMO Execute the same operation for LOT pin. Set ST/SAP, FMONO pins to "H" and MUTE pin to "L". Input pilot signal to COM pin, and assume output voltage of ROT pin "VNST". Input stereo signal (100% modulation, f = 300 Hz) to COM pin, and assume output voltage of ROT pin "VSST". VSST S/NST = 20 log VNST Execute the same operation for LOT pin. Set FMONO pin to "H" and SAP1/2, ST/SAP pins to "L". Input 5fH signal to COM pin, and assume output voltage of ROT pin "VNSAP". Input SAP signal (100% modulation, f = 300 Hz) to COM pin, and assume output voltage of ROT pin "VSSAP". VSSAP S/NSAP = 20 log VNSAP Execute the same operation for LOT pin. Measure DC voltage of 1.5 V pin. Apply flowing current (1 mA) to DCO pin and measure DC voltage of DCO pin.
Stereo total S/N
S/NST
SAP total S/N
S/NSAP
Reference voltage DC saturation voltage
Vref VOSAT2
32
Data Sheet S11666EJ4V0DS00
PC1876
Measuring Circuit Mode Table
(1/2) User ModeNote Item S1 S2 Supply current Stereo detection input sensitivity Stereo detection hysteresis Stereo detection capture range - - - - ST SA - ST ST ST Mute - OFF OFF OFF Measuring F-Monaural - OFF OFF OFF AC voltmeter f-counter AC voltmeter Sin wave SG Equipment DC ammeter AC voltmeter SG/MODE
No signal Pilot
SAP detection input sensitivity SAP detection hysteresis Noise detection input sensitivity Noise detection hysteresis Monaural total output voltage Stereo total output voltage SAP total output voltage SAP single output voltage Difference between monaural L and R output voltages Monaural total frequency characteristics 1 Monaural total frequency characteristics 2 Monaural total frequency characteristics 3 Monaural total frequency characteristics 4 Stereo total frequency characteristics 1 Stereo total frequency characteristics 2 Stereo total frequency characteristics 3 Stereo total frequency characteristics 4 SAP total frequency characteristics 1 SAP total frequency characteristics 2 SAP total frequency characteristics 3 SAP single frequency characteristics 1 SAP single frequency characteristics 2 SAP single frequency characteristics 3 Stereo channel separation 1 Stereo channel separation 2 Stereo channel separation 3 Monaural total distortion rate Stereo total distortion rate 1 Stereo total distortion rate 2 SAP total distortion rate SAP single distortion rate
- - - - - - S1 - -
SA SA SA SA - ST SA SA -
OFF OFF OFF OFF OFF OFF OFF OFF OFF
OFF OFF OFF OFF - OFF OFF OFF -
SAP
AC voltmeter DC voltmeter AC voltmeter
Sin wave SG
Monaural Stereo SAP SAP (NR OFF) Monaural
- - - - - - - - S1 S1 S1 - - - - - - - - - S1 -
- - - - ST ST ST ST SA SA SA SA SA SA ST ST ST - ST ST SA SA
OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF
- - - - OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF - OFF OFF OFF OFF
AC voltmeter
Monaural
AC voltmeter
L-only R-only
AC voltmeter
SAP
AC voltmeter
SAP (NR OFF)
AC voltmeter
L-only R-only
Distortion meter
Monaural Stereo
SAP SAP (NR OFF)
Note ST: Stereo, SA: SAP, S1: SAP1, S2: SAP2, -: free
Data Sheet S11666EJ4V0DS00
33
PC1876
(2/2) User Item S1 S2 Cross talk 1 SAP Stereo Cross talk 2 Stereo SAP Total muting level - ST SA ST Mute OFF ModeNote Measuring F-Monaural OFF Equipment AC voltmeter SG/MODE
Stereo SAP
S1
SA
OFF
OFF
-
-
ON OFF OFF
-
AC voltmeter
Monaural
LED driver saturation voltage
-
-
OFF
DC voltmeter
Stereo SAP No signal No signal
dbx timing current Inter-mode DC offset 1 Mute monaural Inter-mode DC offset 2 Mute stereo Inter-mode DC offset 3 Mute SAP Monaural total S/N Stereo total S/N SAP total S/N
- -
- -
OFF ON OFF ON OFF ON OFF OFF OFF OFF
OFF -
DC ammeter DC voltmeter
-
ST
OFF
Pilot
S1
SA
OFF
5fH signal
- - S1
- ST SA
- OFF OFF
AC voltmeter
No signal Pilot SAP
Note ST: Stereo, SA: SAP, S1: SAP1, S2: SAP2, -: free
34
Data Sheet S11666EJ4V0DS00
PC1876
7. MEASURING CIRCUIT
VCC (9 V) + 100 F 0.1 F fH
GND
PC842C 2/2
10 k +
+
-
1 M 10 k 10 F 6.8 k
4 6
1 k
ST 22 23 24 21 20 19 18 17 16 15
SAP
1 k
Note 1
3 2 1
20 k 10 F 3.3 F + 51 k + 100 k
2.2 k
6.8 k
25
Note 2
30 k + 10 F 91 k
-
26 27 28 29 30 31
IC Rch Lch
+
10 F 10 F 1 F
0.1 F 22 F 1.5 V pin 33 k 10 k 33 k 47 k 20 k 0.1 F + 1 k + 4.7 F 1 F
32 33 34 35 36 37 38 39 40 41 42
50 k 51 k 56 k 14 56 k 1 F 5.1 k 13 3 k + 1 F 12 + 11 10 9 8 7 6 5 4 3 2 1 + + 0.047 F 0.01 F 0.1 F 68 k 0.47 F 0.1 F
PC842C 1/2 +
0.1 F 47 F +
+
10 F 3 k +
+
+
465Z (manufactured by EIDEN Co. Ltd.) ATT OUT SG GND
2.2 F 20 k
Notes 1. Filter: 126XGS-7990Z, manufactured by Toko Co. Ltd. 2. Do not leave the Internally Connected (IC) pin open because it is a base-open pin. Connect this pin to VCC or GND. Remark Use the following for external parts. Resistor () : Metal film resistor (1%). Unless otherwise specified; 5% Capacitors () : Tantalum capacitor (10%). Unless otherwise specified; 20% Variable resistors: 10%
Data Sheet S11666EJ4V0DS00
35
PC1876
8. DIFFERENCES BETWEEN THE PC1876GT AND PC1872GT
PC1876GT
Stereo VCO adjustment external resistor
PC1872GT
38
38 47 k 1%
43 k 1%
20 k 10%
Stereo VCO adjustment
20 k 10%
Stereo VCO adjustment
Filter adjustment input frequency Filter adjustment external resistor
15.734 kHz (= fH)
16.5 kHz
36 33 k 1%
37 33 k 1% 33 k 1%
36
37 30 k 1%
10 k 10%
Filter adjustment
10 k 10%
Filter adjustment
MIN. Stereo total frequency chatacteristics 3 At f = 8 kHz Stereo total frequency chatacteristics 4 At f = 12 kHz SAP total frequency chatacteristics 2 At f = 3 kHz SAP total frequency chatacteristics 3 At f = 8 kHz -2.5 -0.6 -6.0 -1.7
TYP. -0.8
MAX. +0.1
Unit dB
MIN. -0.9
TYP. 0.0
MAX. +0.9
Unit dB
-4.0
-2.5
dB
-5.0
-2.5
-1.0
dB
+0.5
+1.6
dB
-0.3
+0.8
+1.9
dB
-0.5
+1.5
dB
-1.0
+1.0
+3.0
dB
36
Data Sheet S11666EJ4V0DS00
PC1876
9. PACKAGE DRAWING
42-PIN PLASTIC SSOP (9.53 mm (375))
42
22
detail of lead end
P 1 A 21
F H G I J
S
C D E
NOTE
N M
M
S B K
L
Each lead centerline is located within 0.10 mm of its true position (T.P.) at maximum material condition.
ITEM A B C D E F G H I J K L M N P
MILLIMETERS 18.16 MAX. 1.13 MAX. 0.8 (T.P.) 0.35+0.10 -0.05 0.1250.075 2.9 MAX. 2.50.2 10.30.3 7.150.2 1.60.2 0.15+0.10 -0.05 0.80.2 0.10 0.10 3 +7 -3 S42GT-80-375B-2
Data Sheet S11666EJ4V0DS00
37
PC1876
10. RECOMMENDED SOLDERING CONDITIONS
This product should be soldered and mounted under the conditions recommended in the table below. For details of recommended soldering conditions, refer to the information document Semiconductor Device Mounting Technology Manual (C10535E). For soldering methods and conditions other than those recommended below, contact an NEC sales representative. Table 10-1. Surface Mounting Type Soldering Conditions
PC1876GT: 42-pin plastic SSOP (9.53 mm (375))
Soldering Method Infrared reflow Soldering Conditions Package peak temperature: 235C, Duration: 30 sec. max. (at 210C or above), Number of times: 3 times max. VPS Package peak temperature: 215C, Duration: 40 sec. max. (at 200C or above), Number of times: 3 times max. Wave soldering Solder bath temperature: 260C max., Duration: 10 sec. max., Number of times: Once, Preliminary heat temperature: 120C max. (package surface temperature) Partial heating Pin temperature: 300C max., Duration: 3 sec. max. (per pin row) -- WS60-00-1 VP15-00-3 Symbol IR35-00-3
Caution Do not use different soldering methods together (except in the case of partial heating).
38
Data Sheet S11666EJ4V0DS00
PC1876
[MEMO]
Data Sheet S11666EJ4V0DS00
39
PC1876
* The information in this document is current as of May, 2000. The information is subject to change without notice. For actual design-in, refer to the latest publications of NEC's data sheets or data books, etc., for the most up-to-date specifications of NEC semiconductor products. Not all products and/or types are available in every country. Please check with an NEC sales representative for availability and additional information. * No part of this document may be copied or reproduced in any form or by any means without prior written consent of NEC. NEC assumes no responsibility for any errors that may appear in this document. * NEC does not assume any liability for infringement of patents, copyrights or other intellectual property rights of third parties by or arising from the use of NEC semiconductor products listed in this document or any other liability arising from the use of such products. No license, express, implied or otherwise, is granted under any patents, copyrights or other intellectual property rights of NEC or others. * Descriptions of circuits, software and other related information in this document are provided for illustrative purposes in semiconductor product operation and application examples. The incorporation of these circuits, software and information in the design of customer's equipment shall be done under the full responsibility of customer. NEC assumes no responsibility for any losses incurred by customers or third parties arising from the use of these circuits, software and information. * While NEC endeavours to enhance the quality, reliability and safety of NEC semiconductor products, customers agree and acknowledge that the possibility of defects thereof cannot be eliminated entirely. To minimize risks of damage to property or injury (including death) to persons arising from defects in NEC semiconductor products, customers must incorporate sufficient safety measures in their design, such as redundancy, fire-containment, and anti-failure features. * NEC semiconductor products are classified into the following three quality grades: "Standard", "Special" and "Specific". The "Specific" quality grade applies only to semiconductor products developed based on a customer-designated "quality assurance program" for a specific application. The recommended applications of a semiconductor product depend on its quality grade, as indicated below. Customers must check the quality grade of each semiconductor product before using it in a particular application. "Standard": Computers, office equipment, communications equipment, test and measurement equipment, audio and visual equipment, home electronic appliances, machine tools, personal electronic equipment and industrial robots "Special": Transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster systems, anti-crime systems, safety equipment and medical equipment (not specifically designed for life support) "Specific": Aircraft, aerospace equipment, submersible repeaters, nuclear reactor control systems, life support systems and medical equipment for life support, etc. The quality grade of NEC semiconductor products is "Standard" unless otherwise expressly specified in NEC's data sheets or data books, etc. If customers wish to use NEC semiconductor products in applications not intended by NEC, they must contact an NEC sales representative in advance to determine NEC's willingness to support a given application. (Note) (1) "NEC" as used in this statement means NEC Corporation and also includes its majority-owned subsidiaries. (2) "NEC semiconductor products" means any semiconductor product developed or manufactured by or for NEC (as defined above).
M8E 00. 4

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