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Ordering number : ENN5724A
Monolithic Linear IC
LA1780M
Single-Chip Tuner IC for Car Radios
Overview
The LA1780M integrates all six blocks required in a car radio tuner on a single chip. The LA1780M is based on the LA1888NM, and features improvements to each of the blocks; improvements designed to provide improved noise characteristics, especially for noise related to multipath, three-signal intermodulation distortion, and two-signal suppression.
Functions
* FM front end * FM IF * Noise canceller * Multiplex * AM up-conversion * FM/AM switch * MRC
Features
* Improved noise reduction methods -- The FM front end provides excellent 3-signal characteristics equivalent to those of the LA1193M.
-- Superlative listenability due to improved medium and weak field noise canceller characteristics. -- Improved separation characteristics -- Anti-birdie filter -- Improved AM and FM thermal characteristics -- Excellent FM signal meter linearity -- Modified N.C. circuit for improved noise rejection * Double conversion AM tuner (up conversion) Reduces the number of external components required as compared to earlier double conversion tuners, in particular, no crystal is required (when used in conjunction with the LC72144). * Sample-to-sample variation reduction circuit built into the FM IF circuit. (Fixed resistors are used for the SD, keyed AGC, mute on adjustment, ATT, SNC, and HCC functions.) * Since the LA1780M retains the block structure of the LA1888NM, products using that IC can be easily converted, allowing further end product miniaturization.
Package Dimensions
Unit:mm
3159-QFP64E
[LA1780M]
Allowable power dissipation, Pdmax -- mW
Mounted on a 40 x 80 x 1.3 mm3 glass epoxy printed circuit board Independent IC
1.6 1.0
1.0
48 49
0.8
17.2 14.0 0.35
33
1.6 1.0
0.15
32
17.2 14.0 0.8
17
1.0
64 1 16
3.0max 0.8
0.1 2.7
Ambient temperature, Ta -- C
15.6
SANYO: QFP64E (QIP64E)
Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
33100TN (OT)/92498RM (OT) No. 5724-1/38
LA1780M
Specifications
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC1 max VCC2 max Pd max Topr Tstg Pins 6, 40, and 61 Pins 7, 45, 54, 59, and 60 Ta 55C Conditions Ratings 9 12 950 -40 to +85 -40 to +150 Unit V V mW C C
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Operating supply voltage range Symbol VCC VCCST IND VCC op Conditions Pins 6, 7, 40, 45, 54, 59, 60, and 61 Pin 26 Ratings 8 5 7.5 to 9.0 Unit V V V
Operating Characteristics at Ta = 25C, VCC= 8.0V, in the specified test cricuit for the FM IF input
Ratings Parameter Symbol Conditions min 60 205 190 -1 typ 94 310 295 0 0.3 75 55 5 15 28 30 1.2 0.6 82 68 10 20 33 40 2.4 1.6 0.3 20 1 0.5 6 33 27 54 54 10.7 MHz, 100 dB, unmodulated. The pin 23 output No input. The pin 24 DC output, unmodulated 50 dB. The pin 24 DC output, unmodulated 70 dB. The pin 24 DC output, unmodulated 100 dB. The pin 24 DC output, unmodulated 100 dB. The bandwidth when V33 = 2 V, unmodulated 100 dB, 0 dB. The pin 33 DC output, unmodulated 220 0.0 0.4 2.0 4.7 100 0.00 30 5 4.5 10 40 35 62 62 330 0.1 1.0 2.7 5.5 150 0.03 9 8.5 14 47 43 70 70 440 0.3 1.5 3.5 6.2 200 0.20 1.2 4.4 15 25 38 max 110 415 380 +1 1 [FM Characteristics] At the FM IF input Current drain Demodulation output Pin 31 demodulation output Channel balance Total harmonic distortion Signal-to-noise ratio: IF AM suppression ratio: IF ICCO-FM VO-FM VO-FM31 CB THD-FM mono S/N-FM IF AMR IF Att-1 Muting attenuation Att-2 Att-3 Separation Stereo on level Stereo off level Main total harmonic distortion Pilot cancellation SNC output attenuation Separation ST-ON ST-OFF THD-Main L PCAN AttSNC AttHCC-1 HCC output attenuation AttHCC-2 Input limiting voltage Muting sensitivity SD sensitivity IF counter buffer output Vi-lim Vi-mute SD-sen1 FM SD-sen2 FM VIFBUFF-FM VSM FM-1 Signal meter output VSM FM-2 VSM FM-3 VSM FM-4 Muting bandwidth Mute drive output BW-mute VMUTE-100 No input, I40 + I45 + I54 + I59 + I60 + I61 10.7 MHz, 100dB, 1 kHz, 100%mod, The pin 15 output 10.7 MHz, 100dB, 1 kHz, 100%mod, The pin 31 output The ratio between pins 15 and 16 at 10.7 MHz, 100 dB, 1 kHz 10.7 MHz, 100 dB, 1 kHz, 100% mod, pin 15 10.7 MHz, 100 dB, 1 kHz, 100% mod, pin 15 10.7 MHz, 100 dB, 1 kHz, fm = 1 kHz, 30% AM, pin 15 10.7 MHz, 100 dB, 1 kHz. The pin 15 attenuation when V33 goes from 0 to 2 V 10.7 MHz, 100 dB, 1 kHz. The pin 15 attenuation when V33 goes from 0 to 2 V*1 10.7 MHz, 100 dB, 1 kHz. The pin 15 attenuation when V33 goes from 0 to 2 V*2 10.7 MHz, 100 dB, L+R = 90%, pilot = 10%. The pin 15 output ratio The pilot modulation such that V26 < 0.5 V The pilot modulation such that V26 > 3.5 V 10.7 MHz, 100 dB, L+R = 90%, pilot = 10%. The pin 15 signal 10.7 MHz, 100 dB, pilot = 10%. The pin 15 signal/the pilot level leakage. DIN audio 10.7 MHz, 100 dB, L-R = 90%, pilot = 10%. V28 = 3 V 0.6 V, pin 15 10.7 MHz, 100 dB, 10 kHz, L+R = 90%, pilot = 10%. V29 = 3 V 0.6 V, pin 15 10.7 MHz, 100 dB, 10 kHz, L+R = 90%, pilot = 10%. V29 = 3 V 0.1 V, pin 15 100 dB, 10.7 MHz, 30% modulation. The IF input such that the input reference output goes down by 3 dB The IF input level (unmodulated) when V33 = 2 V The IF input level (unmodulated) (over 100 mV rms) such that the IF counter buffer output goes on mA mVrms mVrms dB % dB dB dB dB dB dB % % % dB dB dB dB dB dB dB dB mVrms V V V V kHz V unit
Continued on next page.
No. 5724-2/38
LA1780M
Continued from preceding page. Ratings Parameter [FM FE Mixer Input N-AGC on input W-AGC on input Conversion gain Oscillator buffer output [NC Block] NC input (pin 30) Gate time Noise sensitivity GATE1 SN f = 1 kHz, for a 1-s, 100-mV p-o pulse The level of a 1 = kHz, 1-s pulse input that starts noise canceller operation. Measured at pin 30. The pulse rejection effect provided by the noise canceller. For a repeated 1-s wide pulse, frequency = 10 kHz, 150 mV p-o. The ratio of the FM mode pin 15 output referenced to the AM mode pin 15 output (effective value) 55 40 s mVp-o VN-AGC VWAGC A.V VOSCBUFFFM 83 MHz, unmodulated. The input such that the pin 2 voltage is 2.0 V or below 83 MHz, unmodulated. The input such that the pin 2 voltage is 2.0 V or below. (When the keyed AGC is set to 4.0 V.) 83 MHz, 80 dB, unmodulated. The FE CF output No input 80 100 19 260 87 106 30 370 94 112 48 480 dB dB mVrms mVrms Symbol Conditions min typ max unit
NC effect
SN-NC
5
[Multipath Rejection Circuit] MRC input (pin 27) MRC output MRC operating level VMRC MRC-ON V24 = 5 V The pin 32 input level at f = 70 kHz such that pin 24 goes to 5 V and pin 27 goes to 2 V 2.2 10 2.3 15 2.4 20 V mVrms
[AM Characteristics] AM ANT input Practical sensitivity Detector output Pin 31 detector output AGC F.O.M. Signal-to-noise ratio Total harmonic distortion Signal meter output Oscillator buffer output Wide band AGC sensitivity S/N-30 VO-AM VO-AM31 VAGC-FOM S/N-AM THD-AM VSM AM-1 VSM AM-2 VOSCBUFF AM1 W-AGCsen1 W-AGCsen2 SD sensitivity IF buffer output SD-sen1 AM SD-sen2 AM VIFBUFF-AM 1 MHz, 30 dB, fm = 1 kHz, 30% modulation, pin 15 1 MHz, 74 dB, fm = 1 kHz, 30% modulation, pin 15 1 MHz, 74 dB, fm = 1 kHz, 30% modulation, pin 31 1 MHz, 74 dB, referenced to the output, the input amplitude such that the output falls by 10 dB. Pin 15 1 MHz, 74 dB, fm = 1 kHz, 30% modulation 1 MHz, 74 dB, fm = 1 kHz, 80% modulation No input 1 MHz, 130 dB, unmodulated No input, the pin 5 output 1.4 MHz, the input when V46 = 0.7 V 1.4 MHz, the input when V46 = 0.7 V (seek mode) 1 MHz, the ANT input level such that the IF counter output turns on. 1 MHz, the ANT input level such that the SD pin goes to the on state. 1 MHz, 74 dB, unmodulated. The pin 23 output 0.0 3.8 185 83 74 26 26 200 20 85 75 56 47 120 110 61 52 0.3 0.2 4.8 230 89 80 32 32 290 95 86 38 38 1 0.5 6.2 170 150 66 dB mVrms mVms dB dB % V V mVrms dB dB dB dB mVrms
Note: These measurements must be made using the either the IC-51-0644-824 or KS8277 IC socket (manufactured by Yamaichi Electronics). * 1. When the resistor between pin 58 and ground is 200 k. * 2. When the resistor between pin 58 and ground is 30 k.
No. 5724-3/38
LA1780M Test Conditions
Parameter Current drain Demodulation output Pin 31 demodulation output Channel balance Total harmonic distortion Signal-to-noise ratio: IF AM suppression ratio: IF Muting attenuation 1 Muting attenuation 2 Muting attenuation 3 Separation Stereo on level Stereo off level Main total harmonic distortion Pilot cancellation SNC output attenuation HCC output attenuation 1 HCC output attenuation 2 Input limiting voltage Muting sensitivity SD sensitivity 1 SD sensitivity 2 IF counter buffer output Signal meter output 1 Signal meter output 2 Signal meter output 3 Signal meter output 4 Muting bandwidth Mute drive output N-AGC on input W-AGC on input Conversion gain Oscillator buffer output Gate time 1 Noise sensitivity NC effect MRC output MRC operating level Practical sensitivity Detection output Pin 31 detection output AGC F.O.M. Signal-to-noise ratio Total harmonic distortion Signal meter output 1 Signal meter output 2 Oscillator buffer output Wide band AGC sensitivity 1 Wide band AGC sensitivity 2 SD sensitivity 1 SD sensitivity 2 IF buffer output Symbol ICCO-FM VO-FM VO-FM31 CB THD-FMmono S/N-FM IF AMR IF Att-1 Att-2 Att-3 Separation ST-ON ST-OFF THD-Main L PCAN AttSNC AttHCC-1 AttHCC-2 Vi-lim Vi-mute SD-sen1 FM SD-sen2 FM VIFBUFF-FM VSM FM-1 VSM FM-2 VSM FM-3 VSM FM-4 BW-mute VMUTE-100 VNAGC VWAGC A.V VOSCBUFFFM GATE1 SN SN-NC VMRC MRC-ON S/N-30 VO-AM VO-AM31 VAGC-FOM S/N-AM THD-AM VSM AM-1 VSM AM-2 VOSCBUFF AM-1 W-AGCsen 1 W-AGCsen 2 SD-sen1 AM SD-sen2 AM VIFBUFF-AM Switch states SW1 ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON/OFF ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF SW2 b b b b b b b b b b b b b b b b b b b b b b b b b b b b b a a a a -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- SW3 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 ON ON ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF SW4 b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b b a a a b b b b b b b b b b b b b b b b SW5 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- OFF ON OFF -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- ON ON ON ON ON ON ON ON ON ON ON OFF OFF OFF SW6 ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON OFF OFF OFF ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON OFF OFF OFF SW7 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 -- -- -- -- -- -- -- -- -- -- -- -- -- -- SW8 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 -- -- -- -- -- -- -- -- -- -- -- -- -- -- SW9 ON ON ON ON ON ON ON ON ON ON ON ON ON ON OFF/ON ON ON ON ON ON ON ON ON ON ON ON ON ON ON -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- SW10 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- ON -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
No. 5724-4/38
LA1780M Block Diagram
IF limiter amplifier
No. 5724-5/38
LA1780M Function List FM Front End (Equivalent to the Sanyo LA1193) * Double input type double balanced mixer * Pin diode drive AGC output * MOSFET second gate drive AGC output * Keyed AGC adjustment pin * Differential IF amplifier * Wide band AGC sensitivity setting pin, and narrow band AGC sensitivity setting pin * Local oscillator FM IF * IF limiter amplifier * S-meter output (also used for AM) 6-stage pickup * Multipath detection pin (shared FM signal meter) * Quadrature detection * AF preamplifier * AGC output * Band muting * Weak input muting * Soft muting adjustment pin * Muting attenuation adjustment pin * IF counter buffer output (also used for AM) * SD (IF counter buffer on level) adjustment pin * SD output (active high) (also used for AM) Noise Canceller * High-pass filter (first order) * Delay circuit based low-pass filter (fourth order) * Noise AGC * Pilot signal compensation circuit * Noise sensitivity setting pin * Function for disabling the noise canceller in AM mode Multiplex Functions * Adjustment-free VCO circuit * Level follower type pilot canceller circuit * HCC (high cut control) * Automatic stereo/mono switching * VCO oscillation stop function (AM mode) * Forced monaural * SNC (stereo noise controller) * Stereo display pin * Anti-birdie filter AM * Double balanced mixer (1st, 2nd) * IF amplifier * Detection * RF AGC (narrow/wide) * Pin diode drive pin * IF AGC * Signal meter output (also used for FM) * Local oscillator circuits (first and second) * Local oscillator buffer output * IF counter buffer output (also used by the FM IF) * SD (IF counter buffer on level) adjustment pin * SD output (active high) (also used for AM) * Wide AGC * Detection output frequency characteristics adjustment pin (low cut, high deemphasis) * AM stereo buffer MRC (multipath noise rejection circuit) AM/FM switching output (linked to the FM VCC)
No. 5724-6/38
LA1780M Pin Descriptions
Pin No. Function Description Equivalent circuit 62 pin
1
Antenna damping drive
An antenna damping current flows when the RF AGC voltage (pin 2) reaches VCC-VD.
2
RF AGC
Used to control the FET second gate.
3
F.E.GND
4
OSC
Oscillator connection The transistor and capacitors required for the oscillator circuit are integrated on the chip.
7
AM OSC
AM first oscillator This circuit can oscillator up to the SW band. An ALC circuit is included.
Continued on next page.
No. 5724-7/38
LA1780M
Continued from preceding page. Pin No. Function Description Equivalent circuit
8 9
Noise AGC sensitivity AGC adjustment
After setting up the medium field (about 50 dB) sensitivity with the noise sensitivity setting pin (pin 8), set the weak field (about 20 to 30 dB) sensitivity with the AGC adjustment pin (pin 9)
11 12
Memory circuit connection Memory circuit connection
Recording circuit used during noise canceller operation.
Differential amp
Gate circuit
13
Pilot input
Pin 13 is the PLL circuit input pin.
14
N.C, MPX, MRC, GND
Ground for the N.C., MPX, and MRC circuits. Continued on next page.
No. 5724-8/38
LA1780M
Continued from preceding page. Pin No. Function Description Equivalent circuit
15 16
MPX output (left) MPX output (right)
Deemphasis 50 s: 0.015 F 75 s: 0.022 F
17
Pilot canceller signal output
Adjustment is required since the pilot signal level varies with the sample-to-sample variations in the IF output level and other parameters.
18
Pilot canceller signal output
Pin 18 is the output pin for the pilot canceller signal.
Continued on next page.
No. 5724-9/38
LA1780M
Continued from preceding page. Pin No. Function Description Equivalent circuit
Composite signal
19
Separation adjustment pin
Use a trimmer to adjust the subdecoder input level. (The output level is not modified in mono and main modes.)
20
VCO
The oscillator frequency is 912 Hz. KBR-912F108 (Kyocera Corporation) CSB-912JF108 (Murata Mfg. Co., Ltd.)
21 22
PHASE COMP. PHASE COMP.
Continued on next page.
No. 5724-10/38
LA1780M
Continued from preceding page. Pin No. Function Description Equivalent circuit
23
IF counter buffer seek/stop switching
This pin functions both as the IF counter buffer (AC output) and as the seek/stop switch pin. The voltage V23 switches between the following three modes. During FM reception: 5 V: Seek mode 2.5 V: Forced SD mode 0 V: Reception mode AM reception (two modes: 0 and 5 V) 5 V: Seek mode 0 V: Reception mode
IF counter buffer
SD circuit
Forced SD: 2.5 V
FM S-meter 24 AM/FM signal meter Fixed-current drive signal meter output In AM mode, pin 32 outputs a 1-mA current. Thus the HCC circuit is turned off.
AM S-meter
32
Dedicated FM signal meter
Outputs a 1-mA current during AM reception
26
Stereo indicator for the SD pin
FM reception: the voltage V23 switches between three modes as follows. 5 V: The SD pin operates linked to the IF counter buffer. 2.5 V: Forced SD mode: operates as the SD pin. 0 V: Reception mode: stereo indicator AM reception: (two modes: 0 and 5 V) 5 V: Operates as the seek SD pin. 0 V: Reception mode. Not used.
Stereo indicator Seek/stop switching
Continued on next page.
No. 5724-11/38
LA1780M
Continued from preceding page. Pin No. Function Description Equivalent circuit
27
MRC control voltage time constant
The MRC detector time constant is determined by a 1-k resistor and C2 when discharging and by the 7-A current and C2 when charging. Pin 28
28
SNC control input
The sub-output is controlled by a 0 to 1-V input.
The high band frequency output is controlled by a 0 to 1-V input. It can also be controlled by the MRC output. Use a resistor of at least 100 k when controlling with the pin 32 FM S-meter signal. MRC input
29
HCC control input
Continued on next page.
No. 5724-12/38
LA1780M
Continued from preceding page. Pin No. Function Description Equivalent circuit
FM detector output
30
Noise canceller input
Pin 30 is the noise canceller input. The input impedance is 50 k. Pin 31 is the AM and FM detector output In FM mode, this is a lowimpedance output. In AM mode, the output impedance is 10 k. To improve the low band separation, use a coupling capacitor of over 10 F.
AM detector
31
AM/FM detector output
Noise canceller
32
IF S-meter output and MRC DC input
FM S-meter output block MRC AC input block Adjust the external 1-k resistor to attenuate the MRC AC input and control the circuit.
MRC input
*The muting time constant is determined by an external RC circuit as described below. Attack time: TA = 10 k x C1 Release time: TR = 50 k x C1 *Noise convergence adjustment The noise convergence can be adjusted when there is no input signal by inserting a resistor between pin 33 and ground. *Muting off function Ground pin 33 through a 4-k resistor.
Band muting SD circuit
33
Mute drive output
Continued on next page.
No. 5724-13/38
LA1780M
Continued from preceding page. Pin No. Function Description Equivalent circuit
*The resistor R1 determines the width of the band muting function. Increasing the value of R1 narrows the band. Reducing the value of R1 widens the band. 34 35 36 37 AGC QD output QD input VREF *Null voltage When tuned, the voltage between pins 34 and 37, V34 - 37, will be 0 V. The band muting function turns on when |V34 - 37| 0.7 V. V37 = 4.9 V
Quadrature detector
IF limiter amplifier Band muting
38
FM SD ADJ
A 130-A current flows from pin 38 and, in conjunction with the external resistance R, determines the comparison voltage.
Comparator S-meter
S-meter
39
Keyed AGC AM stereo buffer
The keyed AGC operates when the voltage created by dividing the pin 24 S-meter output voltage by the 6.4 and 3.6 k resistors becomes lower than the voltage determined by the resistor between pin 39 and ground. This pin also is used as the AM stereo IF buffer pin.
Comparator
Continued on next page.
No. 5724-14/38
LA1780M
Continued from preceding page. Pin No. Function Description Equivalent circuit
41
HCC capacitor
The HCC frequency characteristics are determined by the external capacitor connected at this pin.
This pin is used to change the frequency characteristics of the unneeded audio band under 100 Hz in AM mode to produce a clear audio signal. Note: The LC capacitor must be connected between this pin and VCC (pin 40). This is because the detector circuit operates referenced to VCC. The cutoff frequency fC is determined by the following formula. fC = 1/2 x 50 k x C
42
AM L.C. pin
43
Pilot detector
Inserting a 1-M resistor between pin 43 and VCC will force the IC to mono mode.
Continued on next page.
No. 5724-15/38
LA1780M
Continued from preceding page. Pin No. Function Description Equivalent circuit
44
IF AGC
Q1: Used for time constant switching during seeks. = 2.2 F x 300 k * Seek = 2.2 x 10 The external capacitors are connected to VCC. This is because the IF amplifier operates referenced to VCC.
Pin 40 VCC
Pin 40 VCC
45
IF output
The IF amplifier load
46
AM antenna damping drive output Wide band AGC input
I46 = 6 mA (maximum) This is the antenna damping current.
Continued on next page.
No. 5724-16/38
LA1780M
Continued from preceding page. Pin No. Function Description Equivalent circuit
47
FM muting on level adjustment
Modify the value of the external resistor to adjust the muting on level.
Pin 24
Inverter
48 57
RF AGC bypass RF AGC
RF AGC rectification capacitor The low frequency distortion is determined as follows: Increasing C48 and C57 improves the distortion but makes the response slower. Reducing C48 and C57 aggravates the distortion but makes the response faster.
Antenna damping
For AGC use
50 51
IF bypass FM IF input
Due to the high gain of the limiter amplifer, care must be taken when choosing the grounding point for the limiter amplifer input capacitor to prevent oscillation.
52
IF input
The input impedance is 2 k.
Continued on next page.
No. 5724-17/38
LA1780M
Continued from preceding page. Pin No. Function Description Equivalent circuit
* Input and output pin or the first IF amplifier * Inverting amplifier 53 56 IF amplifier output IF amplifier input V56 = 2 V Input impedance: RIN = 330 V53 = 5.3 V Output impedance ROUT = 330
Pin 40 VCC
Pin 40 VCC
54 49
Mixer output: 130 A Mixer input
The mixer coil connected to the pin 54 mixer output must be wired to VCC (pin 40). The pin 49 mixer input impedance is 330
Pin 62 VCC Pins 55 and 58 include built-in DC cut capacitors. The AGC on level is determined by the values of the capacitors C1 and C2. 55 W-AGC IN AM SD ADJ N-AGC IN Muting attenuation adjustment pin Pin 55 functions as the SD sensitivity adjustment pin in AM mode. The output current I55 is 50 A, and V55 varies depending on the value of the external resistor. The SD function operates by comparing V55 with the S-meter voltage.
58
Signal meter
Continued on next page.
No. 5724-18/38
LA1780M
Continued from preceding page. Pin No. Function Description Equivalent circuit
Double balanced mixer Pins 60 and 61 are the mixer 10.7-MHz output Pins 63 and 64 are the mixer input. This is an emitter insertion type circuit, and the amount of insertion is determined by the capacitors C1 and C2. Note:The lines for pins 63 and 64 must be kept separated from the lines for pins 60 and 61.
59 60 63 64
Mixer output Mixer input
Pin 62 functions both as the FM front end VCC and the AM/FM switching circuit. 6 Front end VCC AM/FM switching V6 voltage Mode
AM/FM switching circuit
When 8 V FM OPEN AM
To RF Amp.
62
1st MIX INPUT
First mixer input The input impedance is about 10 k.
To 2nd MIX 10 AM 2nd OSC Crystal oscillator circuit The Kinseki, Ltd. HC-49/U-S and a CL of 20 pF must be used.
Continued on next page.
No. 5724-19/38
LA1780M Usage Notes 1. Notes on VCC and Ground
Pin 40 Pin 25 Pin 14 Pin 61 * Pin 6 Pin 3 VCC for the FM IF, AM, NC, MPX, and MRC blocks Ground for the FM IF and AM blocks Ground for the NC, MPX, and MRC blocks VCC for the FM front end, AM first mixer, and first oscillator blocks VCC for the FM front end and AGC blocks, and the AM/FM switching pin Ground for the FM front end, first mixer, and first oscillator blocks
2. Notes on AM Coil Connection The VCC used for the first oscillator coil connected to pin 7 must be at the same potential as pin 61. Connect to the IFT connected with pin 45, and to the MIX coil connected with pin 54. VCC must be at the same potential as pin 40. 3. AM/FM Switching Pin 6 is also used as the FM front end and RF AGC VCC
Pin 6 voltage 8 OPEN
Mode FM AM
4. Relationship between Pin 23 and Pin 26 * FM mode Pin 26 functions as both the stereo indicator and the SD pin. Pin 23: DC-input seek/stop pin (control pin) AC output IF counter buffer pin
IF counter buffer Between 0 and a few thousand Ohms.
The Pin 23 Control Function and the Relationship between Pin 23 and Pin 26
SW1 OPEN ON -- SW2 OPEN OPEN ON Pin 23 voltage 5V 2.5 V Under 0.7 V Pin 26 IF counter buffer on OFF OFF Pin 26 SD High-speed SD Stereo indicator
No. 5724-20/38
LA1780M
S-meter Larger R38 Smaller R38
V33 0.7 V or over
V33 0.7 V or over
On and functioning as SD
Stereo
Mono
IF counter buffer on
IF counter output off
Used as RDS and similar function SD detection by switching this mode.
Notes on FM SD
Band muting Mute drive output
S-meter
IF counter buffer
IF counter output
No. 5724-21/38
LA1780M * AM mode
S-meter Larger R55
Smaller R35
Pin 55: AM SD Adjustment Pin * Pins that support AM stereo
To an AM stereo decoder 400-mV rms 450-kHz output
Keyed AGC
* To attenuate the pin 39 AC level: Add a capacitor between pin 39 and ground. For example, if a capacitor is added between pin 39 and ground, and pin 51 is attached, the AM IF output will be reduced by about 6 dB.
No. 5724-22/38
LA1780M * Notes on the muting attenuation The resistor between pin 58 and ground switches the muting attenuation to one of three levels, -20, -30, and -40 dB. This is also related to the tuner's total gain.
R OPEN 200k 30k
Mute ATT -20 dB -30 dB -40 dB
If R33 is reduced, the attenuation will be reduced as listed in the table above.
Muting time constants Attack: 10 k x C33 Release: 50 k x C33
Quadrature detector
Limiter
No. 5724-23/38
LA1780M * MRC circuit
S-meter
FM S-meter
Noise amplifier fc = The MPF + AMP 70 kHz
Required external transistor: 2SC536 or equivalent Reason: Since the LA1780M MRC is a simplified circuit, an OMRC level shifter is required.
To SNC Pin 28
* If there is no AC noise on pin 32: V24 = V27 - VBE QMRC V27 will be about 2.5 V for an antenna input of 60 dB or higher. * Since the MRC noise amplifier gain is fixed, the MRC circuit is adjusted by reducing the AC input level.
* The MRC circuit attack and release times are determined by the capacitor C27 on pin 27. Attack: 7 A x C27 Release: 500 x C27 5. FM Soft Muting
Smaller R47
Larger R47
Larger R47
Smaller R47
By comparing the pin 47 mute on adjustment voltage to the S-meter voltage (V24), the muting on point can be adjusted.
No. 5724-24/38
LA1780M * Noise canceller notes The characteristics of the noise canceller have been improved by implementing the circuit that determines the gate time in logic. In earlier noise canceller circuits, since the time constant was determined with an RC circuit such as the one shown in figure 5, the rise time was influenced by the RC circuit time constant as show in figure 6. This meant that the rise was delayed and the associated switching delay resulted in a reduction of the circuit's ability to exclude noise. In the LA1780M, the rise time is made shorter by implementing the circuit that determines the gate time in logic. This allows the LA1780M to eliminate noise reliably.
Figure 5
Figure 6
* Gain distribution (FM) This section analyzes the gain in each of the blocks in the LA1780M when the Sanyo recommended circuit is used. Test conditions Ambient temperature: 26C Antenna and mixer input frequency: 98.1 MHz First and second IF input frequency: 10.7 MHz Input levels when VSM = 2 V were measured to be: Antenna input: 19 dB Mixer input: 30 dB First IF input: 42 dB Second IF input: 60 dB These values allow the gains in each block to be calculated as follows. RF gain: 11 dB Mixer gain: 12 dB
No. 5724-25/38
LA1780M AM This section analyzes the gain in each of the blocks in the LA1780 when the Sanyo recommended circuit is used. Test conditions Ambient temperature: Antenna and mixer 1 input frequency: Mixer 2 input frequency: IF and detector input frequencies: An AM dummy is attached.
26C 1 MHz 10.71 MHz 450 kHz
When an input level such that the output becomes -35 dBm is determined, the I/O characteristics of each stage were determined to be as follows: Antenna input: 9.5 dB Mixer 1 input: 25.6 dB Mixer 2 input: 29.5 dB IF input: 36.0 dB Detector input: 102.0 dB These values allow the gains in each block to be calculated as follows. RF gain: 16.1 dB Mixer 1 gain: 3.9 dB Mixer 2 gain: 6.5 dB IF gain: 66.0 dB
No. 5724-26/38
LA1780M * Input circuits used at each stage [FM] Mixer input
First IF input
Actual measurement
IF input
[AM] First mixer input
Second mixer input
IF input
Detector input
No. 5724-27/38
LA1780M * 3D AGC (keyed AGC) settings
S-meter
VS-meter
* The antenna damping function operates by providing the pin diode antenna damping current from the pin when the pin 2 voltage becomes equal to VCC - VBE. * The noise AGC circuit operates as follows: When the pin 39 voltage is greater than (6.4/3.6) times the pin 24 voltage, the ACG circuit is off. When the pin 39 voltage is less than (6.4/3.6) times the pin 24 voltage, the ACG circuit is on.
No. 5724-28/38
LA1780M AM AGC System
The LA1780M RF AGC is picked up from three locations. * The wide AGC determined by Rw * The middle AGC picked up from the pin 49 second mixer input The operating bandwidth is 150 kHz to 180 kHz (the bandwidth of the 10.7 MHz CF) * The narrow AGC picked up from pin 52 The operating bandwidth is 7 kHz (the bandwidth of the 450 kHz CF)
AM AGC Frequency Characteristics
Wide AGC Operates for wide-band interfering stations. Wide AGC Operates for wide-band interfering stations.
AGC on level
Middle AGC Operates for interfering stations that are 70 kHz from the received frequency.
Middle AGC Operates for interfering stations that are 70 kHz from the received frequency. Narrow AGC Operates at the received frequency.
Frequency, -- Hz
No. 5724-29/38
LA1780M * Sample AM application using the LC72144 and the LA1780M
AM 1st IF 1 2 fOSC 10.25 MHz fOSC 10.35 MHz 10.7 MHz 10.8 MHz
Step 10 K, 1 K 9 K, 10 K
FM IF 10.7 MHz 10.8 MHz
No. 5724-30/38
LA1780M Crystal Oscillator Element (Kinseki, Ltd.) HC-49/U-S Frequency: 10.26 MHz Load capacitance: 20 pF Equivalent series resistance: 90 Coil Specifications (SUMIDA ELECTRIC CO., LTD.) Application: Prototype number [AM Block] AM FILTER AM OSC AM IF1 (MIX) SA-1051 SA-359 SA-264 SA-1111 SA-1009 SA-1063 SA-1112 SA-265 SA-1062 SA-1048 RC875-222J SA-1060 SA-1061 SA-1052 SA-266 SA-208 SA-360 Model number Y-5G (For the first mixer input: 5 mm diagonal) S-7LB PG78 PG57 (5 mm, high reliability) P-5DJ (5 mm diagonal) PG78 PG57 (5 mm, high reliability) P-5DJ (5 mm diagonal) MG78 MG78 RC875 S-7LDJ S-7LDJ S-7LDJ P-7LFJ (Double balanced mixer) QU-7L (Quadrature detector) QU57 (5 mm diagonal, quadrature detector)
AM IF2
AM loading AM antenna input AM RF amplifier [FM Block] FM RF FM ANT FM OSC FM MIX FM DET AM Block
* SA-359 (AM FILTER) x - y 16T y - z 16T 0.08 UEW
* SA-264 (AM IF1) x - y 30T } - { 19T y - z 151T 0.05 UEW
* SA-1063 (AM IF2) x - y 75T y - z 75T 0.05 UEW
* SA-1062 (AM loading) x - z 850T 0.05 UEW
* SA-1048 (AM ANT IN) x - z 74T 0.07 UEW
No. 5724-31/38
LA1780M FM Block * SA-1060 (FM RF) } - { 1T 0.10 UEW z - x 3T z - x 3T 0.16 UEW * SA-1061 (FM ANT) } - { 3T } - { 3T 0.16 UEW
* SA-1052 (FM OSC) } - x 2T } - x 2T 0.18 UEW
* SA-266 (FM MIX) z - x 3T 1 }-y6 T 2 1 y-{6 T 2 0.10 UEW
* SA-208 (FM DET) 1 T 4 0.08 UEW 1 z - x 70 T 4 0.06 UEW { - z 18 Coil Specifications (Toko INC) [AM Block] AM ANT ANT Choke MIX LPF AM 2nd MIX AM OSC AM IFT2 [FM Block] AM, FM, MIX FM DET FM ANT FM RF FM OSC Toko Part No. 269ANS-0720 385BNS-027Z 187LY-222K A286LBIS-15327 L7TCS-3039A V666SNS-213BY 7PSG-5002 3710H-1108FYH DM600DEAS-8407 666SNS-219NK 666SNS-218AQ V666SNS-205APZ
No. 5724-32/38
LA1780M FM Block * 3710H-1108FYH (AM * FM * MIX) z - x 13T 1 z-|6 T 2 1 |-x6 T 2 } - { 2T 0.07o ZUEW * 666SNS-219NK (FM ANT) 1 T 2 0.1o ZUEW {-}2 * DM600DEAS-8407GLF (FM DET) 1 T 2 1 }-{2 T 2 z - x 59T 0.07o ZUEW } - z 19
* 666SNS-218AQ (FM RF) 1 T 2 } - { 1T 0.1o ZUEW z-x2
* V666SNS 205APZ (FM OSC)
}-x2 0.12o ZUEW
AM Block * 269ANS-072Z (AM ANT) x - z 60T 0.06 3UEW * 385BNS-027Z (ANT) x - z 60T 0.06o 3UEW
* 187LY-222K (Choke)
* A286LBIS-15327 (MIX LPF) 243 0.1o ZUEW
No. 5724-33/38
LA1780M * L7TCS-3039A (AM 2nd MIX) x - z 152T x - y 25T y - z 127T } - { 16T 0.05o 3UEW * V666SNS-213BY (AM OSC) z - x 24 1 T 2 1 z - y 12 T 4 1 y - x 12 T 4 0.1o ZUEW
* 7PSG-500Z (AM IFTZ)
x - z 148T x - y 74T y - z 74T 0.05o 3UEW
No. 5724-34/38
LA1780M
FM I/O Characteristics
HCC, SNC, RF AGC, muting voltage, Smeter voltage, VSM -- V Output, noise, AM output, LR output -- dB
FM I/O Characteristics
Antenna input, -- dB
Antenna input, -- dB
FM Distortion
Total harmonic distortion, THD -- %
FM Sensitivity Suppression
Antenna input, -- dB
Output, noise -- dB
Antenna input, -- dB
FM Gain Distribution (1)
Output, noise, AM output -- dB
FM Gain Distribution (2)
Input, -- dB
DCV -- V
Input, -- dB
Mixer I/O Characteristics
First IF I/O Characteristics
Mixer input, -- dB
First IF output -- dB
Mixer output -- dB
First IF input, -- dB
No. 5724-35/38
LA1780M
First IF Frequency Characteristics. AM I/O Characteristics
First IF output -- dB
Frequency, -- MHz
Output, noise -- dB Output -- dB
Antenna input, -- dB
AM Distortion
Total harmonic distortion, THD -- %
AM DC Characteristics
Antenna input, -- dB
AGC, S-meter voltage -- V
Antenna input, -- dB
FM Antenna Input Temperature Characteristics (1)
S/N, AM output -- dB AGC on, separation, input level -- dB
FM Antenna Input Temperature Characteristics (2)
Output - mV rms
Separation
Ambient temperature, Ta -- C
Ambient temperature, Ta -- C
FM Antenna Input Temperature Characteristics (3)
FM Antenna Input Temperature Characteristics (4)
Ambient temperature, Ta -- C
Separation, Sep -- dB
Antenna input -- dB
Ambient temperature, Ta -- C
No. 5724-36/38
LA1780M
FM Antenna Input Temperature Characteristics (5)
Total harmonic distortion, THD -- %
FM Antenna Input Temperature Characteristics (6)
Ambient temperature, Ta -- C
S-meter voltage, VSM -- V
Ambient temperature, Ta -- C
AM Antenna Input Temperature Characteristics (1)
AGC on level -- dB AGC FOM, S/N, QS, SD sensitivity -- dB Total harmonic distortion, THD -- % S-meter voltage, VSM -- V Ambient temperature, Ta -- C
AM Antenna Input Temperature Characteristics (2)
Ambient temperature, Ta -- C
AM Antenna Input Temperature Characteristics (3)
FM Soft Muting (1)
Ambient temperature, Ta -- C
Output, noise -- dB
Output -- mV rms
Antenna input, -- dB
FM Soft Muting (2)
FM Soft Muting (3)
Output, noise -- dB Output -- dB
Antenna input, -- dB
Output -- dB
Antenna input, -- dB
No. 5724-37/38
LA1780M
AM AGC Frequency Characteristics AM AGC Frequency Characteristics
AGC on level -- dB
With a 10-pF capacitor connected to pin 58
Frequency, -- MHz
AGC on level -- dB
Frequency, -- Hz
Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of March, 2000. Specifications and information herein are subject to change without notice. PS No. 5724-38/38

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