View LA7583_771478.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Ordering number: EN5177
Monolithic Linear IC
LA7583 IF Signal Processing Circuit (A C PLL VIF + SIF) for TVs and VCRs
2
Overview
The LA7583 is a VIF + SIF IC that requires no adjustments. In order to eliminate the need for adjustments in the VIF block, a multi-network PLL has been developed and adopted for video detection. In the SIF block, adjustments were eliminated by using gyrator technology in the FM quadrature detector. In addition to eliminating the need for adjustments, a buzz canceller that suppresses Nyquist buzz has been built into the LA7583 in order to provide excellent sound quality.
Package Dimensions
unit : mm
3067-DIP24S
[LA7583]
Features
. Elimination of VCO, AFT, and SIF coils eliminates the need adjustments. . forvariety of built-in filters. A . Built-in buzz canceller results in excellent audio
characteristics. Note: A2C Automatic Adjustment Control AQT Automatic Quadrature Tuning
SANYO : DIP24S
Functions
[VIF] VIF amplifier Equalizer amplifier AGC lag lead filter [1st SIF] Preamplifier [SIF] Limiter amplifier [mute] Audio mute
. . . . . .
. Multinetwork PLL . AFT . Video driver . 1st SIF detector . AQT detector (gyrator) . AV mute
. BNC . IFAGC . AGC detector . J/U switch
. FAGC . Buzz canceller . Built-in AGC filter
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
83095HA(II) No.5177-1/15
LA7583
Specifications
Maximum Ratings at Ta = 25 C
Parameter Maximum supply voltage Circuit voltage Circuit current Symbol VCC 1 VCC 2 V4 V3, V11 I1, I10, I23 I3, I21 I15, I19 Allowable power dissipation Operating temperature Storage temperature Pd max Topr Tstg Ta % 50 C Conditions Ratings 7 13.2 VCC 1 VCC 2 -1 -3 -5 1000 -20 to +70 -55 to +150 Unit V V V V mA mA mA mW C C
* A2C (Automatic Adjustment Control) Note: Current flowing into the IC is positive (no signal) and current flowing out is negative.
Pin Assignment
Allowable power dissipation, Pd max - mW
Top View
Pd max -- Ta
Ambient temperature, Ta - C No.5177-2/15
LA7583
Operating Conditions at Ta = 25 C
Parameter Recommended supply voltage Operating supply voltage range Symbol VCC1 VCC2 VCC1 VCC2 Conditions Ratings 5 9 4.6 to 6 7 to 12 Unit V V V V
Electrical Characteristics at Ta = 25 C, VCC1 = 5 V, VCC2 = 9 V, fp = 45.75 MHz
Parameter [VIF Block] Circuit current 1 Circuit current 2 Maxinum RF AGC voltage Mininum RF AGC voltage Input sensitivity AGC range Maxinum Allowable Input Video output voltage with no signal Sync signal tip voltage Video output amplitude Black noise threshold level voltage Black noise clamp voltage Output S/N 920 kHz beat level Frequency characteristics Differential gain Differential phase AFT output voltage with no signal Maxinum AFT output voltage Mininum AFT output voltage AFT detection sensitivity VIF input resistance VIF input capacity APC pull-in range (U) APC pull-in range (L) AFT crossover frequency VCO1 maximum variable range VCO2 maximum variable range VCO1 control sensitivity VCO2 control sensitivity [1st SIF Block] 4.5 MHz output gain 4.5 MHz output level 1st SIF maximum input level 1st SIF input resistance 1st SIF input capacity Symbol I20 I8 V3H V3L Vi GR Vi max V19 V19(tip) VO(V) VBTH VBCL S/N I920 fC DG DP V11 V11H V11L Sf Ri(VIF) Ci(VIF) fPU fPL fA fU1 fL1 fU2 fL2 1 2 VG SO Si (max) Ri (SIF1) Ci (SIF1) VCC = 5 V VCC = 9 V V4 = 3 V V4 = 1.5 V S1 = OFF Conditions min 57 7.8 7.5 32 56 95 3.3 1.1 1.7 0.4 1.65 48 41 6 typ 66 11.0 8.1 0 38 62 103 3.6 1.4 2.0 0.7 1.95 52 45 8 3 3 4.5 8.5 +1 48 1.1 3 3 -4.5 5.0 -5.0 200 -1000 4.8 0.6 26 85 70 2 3 max 78 14.0 9 +0.5 44 Unit mA mA V V dB dB dB V V Vp-p V V dB dB MHz % rad V
V4 = 2 V Vi = 10 mV 87.5% mod
3.9 1.7 2.3 1.1 2.25
P = 0, C = -10 dB, S = -10 dB P = 0, S = -14 dB Vi = 10 mV, 87.5% 10STAR STEP
8 8 8.7
0.3 7.5 0 33 0.8 2 1.0 -65 2.0 100 2.4 0.3 23 50 60 1.2
f = 45.75 MHz f = 45.75 MHz
V22 V22 V16 V16 V22 V16
= = = = = =
4V 2V 4V 2V 2.8 V to 3.2 V 2.8 V to 3.2 V
9 V +1.5 V 69 mV/kHz 1.5 k 5 pF MHz -1.0 MHz +65 kHz MHz -2.0 MHz kHz -200 kHz 9.6 kHz/mV 1.2 kHz/mV 29 dB 120 mVrms mVrms k 6 pF
Vi = 1 mV, 41.25 MHz Vi = 10 mV, 41.25 MHz So + 12 dB - 1 dB f = 41.25 MHz f = 41.25 MHz
Continued next page.
No.5177-3/15
LA7583
Continued from preceding page.
Parameter [SIF Block] SIF limiting sensitivity FM detection output voltage AMR Total harmonic distortion SIF S/N [Mute defeat] FM mute AFT defeat voltage J/U SW start voltage AV mute voltage Symbol Vi (lim) VO AMR THD S/N(SIF) V24T VD11 VJU24 VM23 Conditions f = 25 kHz, 400 Hz Vi = 100 mV, f = 25 kHz, 400 Hz AM = 30%, 400 Hz f = 25 kHz, 400 Hz f = 25 kHz, 400 Hz min 47 300 40 55 0.5 3.9 1.5 1 typ 53 400 56 0.4 59 1.0 4.5 2.0 1.5 max 59 520 1.5 Unit dB mVrms dB % dB V V V V
5.1 2.5
No.5177-4/15
LA7583
Equivalent Circuit Block Diagram
Multinetwork PLL (Automatic Adjustment Control)
The LA7583's PIF detector uses a multinetwork PLL and a buzz canceller. The multinetwork PLL is a PLL detector that was developed in order to eliminate the need for adjustments in video detection. This PLL detector offers the following features: (1) Eliminates the need for adjustments in video detection. (2) The PLL detection characteristics are unaltered. a. Offers better waveform response characteristics in comparison with the quasi-synchronous detection method. b. The harmonic wave component of the video signal (demodulated output) is reduced. c. The 1/2 IF signal suppression ratio is improved. (3) Audio buzz is greatly reduced by the buzz canceller. A typical PLL detector consists of the blocks shown below.
In these blocks, if the VCO coil is not adjusted to the IF frequency, a phase difference will appear in the control loop. As a result, the PLL detector detection axis will shift from the ideal 180 . The group delay, DP characteristics, etc., deteriorate as a result.
No.5177-5/16
LA7583
[Multinetwork PLL] The multinetwork PLL consists of the blocks shown below.
The multinetwork PLL has two VCO circuits. Each of these form a separate PLL. The operational relationship between these circuits is as follows: fVCO1 = fVCO2 x 8 Initially, in APC1, the phases of the IF signal and the VCO carrier are compared. The control signal derived is then used to control VCO2. VCO1 is controlled by comparing the phases of VCO2 and VCO1 x 1/8. As a result, VCO1 always has the same frequency as the IF signal, and the following relationship results: fVCO1 = fVCO2 x 8 If the precision of the ceramic oscillator for fVCO2 is within the adjustment range for VCO in a typical PLL, the video detector phase error is very small. As a result, the multinetwork PLL operates as an ideal PLL detector. Automatic Quadrature Tuning (AQT) A quadrature detector that is controlled automatically is used in the FM detector. The AQT in the LA7583 consists of the blocks shown in the following diagram.
The FM detection filter (gyrator) is controlled at 4.5 MHz by the control current (Iref1) generated by reference circuit 1. At the same time, precision control is performed by using the control current (Iref2) derived by detecting the offset from the detected output so that the FM detector phase relationship is 90 . As a result, automatic control makes an ideal quadrature detector possible. (Note) Gyrator: Circuit-formed equivalent inductance The SIF circuit contains a 4.5 MHz tank circuit having the gyrator and an internal capacitor.
No.5177-6/15
LA7583
Pin Functions
Pin No. 1 Symbol FM DETECTOR OUTPUT Circuit Configuration Description Pin 1 is an audio FM output pin. A 100 resistor is connected in series with the emitter follower. (1) Monaural applications CR are used to form a de-emphasis cicuit externally. t = CR1 (2) Audio multiplexing applications Depending on the audio multiplexing decoder application, the input impedance is low, which may distort the L-R signals, etc., and degrade the stereo characteristics. In such an event, add a resistor between pin 1 and GND. R2 ^ 5.1 k
2
FM AQT FILTER
GYLATOR
Pin 2 is the FM Automatic Quadrature Tuning filter pin. This pin controls the quadrature detector so that it remains at its center frequency (4.5 MHz), and is the point where the two control currents are added. If the value of external capacitor C1 is small, the low-range frequency characteristics deteriorate. If the capacitance is too large, the low-range characteristics improve, but the response characteristics at SW-ON, etc., worsen. The recommended value for C1 is 10 F to 33 F.
3
RF AGC OUTPUT
Pin 3 is the RF AGC output pin. It is an emitter output, and a protective resistor of 200 is connected between pin 3 and emitter. This pin determines the resistance bleeder (R1, R2) values according to the maximum gain of the tuner.
Continued on next page.
No.5177-7/15
LA7583
Continued from preceding page.
Pin No. 4 IF AGC Symbol Circuit Configuration Description Pin 4 is the 1st IFAGC filter pin. This filter smoothes out the peaks detected in the signal by the AGC detector, and generates the AGC voltage. The 2nd AGC filter (lag lead filter) is built in using filter technology. The cutoff frequency is approximately 500 Hz. AGC filter constants and AGC speed Medium-speed AGC: R1 = 330 k C1 = 0.1 F High-speed AGC: R1 = 470 k C1 = 0.056 F
.
5 6
VIF INPUT
Pins 5 and 6 are the VIF amplifier input pins. The VIF amplifier has three stages, each of which uses a C cut, so when used in conjunction with a SAW filter, DC cut by a capacitor becomes unnecessary. Ri = 1.1 k Ci = 3 pF
9
1st SIF INPUT
Pin 9 is the 1st SIF input pin. Input is such that DC cut must be performed using a capacitor. When a SAW filter, etc. is used in the input circuit, an L that is used to neutralize the SAW filter output capacitance and the IC input capacitance serves to improve the 1st SIF sensitivity.
Continued on next page.
No.5177-8/15
LA7583
Continued from preceding page.
Pin No. 10 VCOR Symbol Circuit Configuration Description Pin 10 is the pin for connecting the resistor that determines the impedance of the oscillation point of the oscillating circuit by the ceramic oscillator. Oscillation frequency variations can be reduced by connecting a resistor with a tolerance of 1% between pin 10 and pin 12.
11
AFT OUTPUT
Pin 11 is the AFT output pin. This pin determines the gain (control sensitivity: (kHz/mV)) according to the R1 and R2 bleeder resistance values. is decreased in weak electric fields by AGC voltage in order to reduce malfunction of AFT. R1 and R2 must be 200 k or less. AFT curve for medium/ strong electric fields AFT curve for weak electric fields
12
VCO2
Pin 12 is the ceramic oscillator (VCO2) pin. A series resonance-type oscillator is used to oscillate 1/8 of the IF signal. Japan = 58.75 MHz x 1/8 U.S. = 45.75 MHz x 1/8
Continued on next page.
No.5177-9/15
LA7583
Continued from preceding page.
Pin No. 13 14 Symbol VCO COIL Circuit Configuration Description Pins 13 and 14 are the VCO tank circuit. VCO coil recommended Japan 1.2 H U.S. 1.8 H Make the circuit pattern between the IC and the coil as short as possible.
. .
15
VIDEO OUTPUT
Pin 15 is the SIF carrier (4.5 MHz)-contained video output pin. The level of the video output is approximately 1.5 Vp-p.
16
APC1 FILTER
Pin 16 is the APC1 filter pin. The filter smoothes the output after comparing the phase of the IF signal with that of VCO1 in APC1. C1 = 0.47 F R1 = 330 to 560 C2 = 470 pF
Continued on next page.
No.5177-10/15
LA7583
Continued from preceding page.
Pin No. 17 Symbol EQUALIZER INPUT Circuit Configuration Description Pin 17 is the equalizer amplifier input pin. A signal which has passed through a 4.5 MHz trap is input through pin 17 and is output through pin 19. The input level of pin 17 is 1.5 Vp-p. This is amplified 3 dB to 2 Vp-p by the equalizer amplifier.
.
18
EQUALIZER FILTER
Pin 18 is the equalizer pin. The equalizer amplifier is of the voltage follower type with a voltage gain of 3 dB. To correct the frequency characteristics, connect LCR externally. The operating characteristics are as follows: Ve R1 Av = =1+ (times) Vi Z
19
EQUALIZER OUTPUT
Pin 19 is the equalizer amplifier output pin. This output has a built-in low-impedance drive circuit.
Continued on next page.
No.5177-11/15
LA7583
Continued from preceding page.
Pin No. 21 Symbol 1st SIFOUT Circuit Configuration Description Pin 21 is the 1st SIF output pin. The SIF carrier output level is approximately 50 mVrms.
22
APC2 FILTER
Pin 22 is the APC2 filter pin. The filter smoothes the output after comparing the phase of VCO2 with that of VCO1 x 1/8 in APC2. C1 = 0.47F R1 = 33
23
RF AGC VR
Pin 23 is the RF AGC adjusting pin. The adjustment point is where Rv approximates 15 k. AV (audio/video) mute is effected by dropping this pin to GND.
Continued on next page.
No.5177-12/15
LA7583
Continued from preceding page.
Pin No. 24 Symbol SIF INPUT, J/U SW Circuit Configuration Description Pin 24 is used both for SIF input and J/U SW audio mute. The input impedance is approximately 1.5 k. J/U (Japan/U.S.) switch The oscillating frequency for VCO2 in Japan and the U.S. differs. However, the center frequency of the SIF detector is controlled using VCO2 as a reference. As a result, the filter control mode can be changed either by leaving this pin open or dropping it to GND through a 3.9 k resistor. Open: Japan mode 3.9 k: U.S. mode Audio mute: Audio muting can be applied by dropping the voltage on this pin to 0.5 V or less.
. .
.
LA7583 VCO COIL design considerations 1. Design criteria Allow for an adequate variable range for the IF frequency in the design. Specifically, select a coil value so that the carrier frequency is roughly in the center of the characteristics diagram shown below when 2 V and 4 V are applied to pin 22. 2. Design notes a. When selecting the L value, the LA7583 must be soldered directly on the board. If an IC socket is used, an error in the VCO center frequency will arise from the capacitance of the socket. b. The patterns for pins 13 and 14 must be made as short as possible (15 mm or less). Minimize the effect of the printed pattern. c. A VCO coil of which tolerance is 5% must be used. 3. Measuring the IF frequency range Drop the IF AGC (pin 4) to GND. Next, pick up the VCO carrier leak at a pin other than the VCO coil (pins 13 and 14) and read the carrier frequency. And then, apply a voltage ranging from 1.5 V to 4.5 V to pin 22, and record the characteristics of the maximum variable frequency range for VCO as shown in the diagram below. US fO : 45.75 MHz JAPAN fO : 58.75 MHz
fO - MHz
Y22 - V
fO - MHz
Y22 - V
4. Recommended VCO coil A. Tokyo Parts Industry Co., Ltd.
5LC
JAPAN U.S.
1.2 H 5% 1.8 H 5%
No.5177-13/15
LA7583
Notes on Sanyo SAW Filters There are two types of filters, depending on the piezoelectric substrate material. (1) LiTaO3 (lithium tantalate) SAW filters: .......TSF1xxx TSF2xxx While the LiTaO3 SAW filters offer excellent stability with a low temperature coefficient of -18 ppm/ C, the insertion loss is high. However, by using a coil, etc., to obtain proper matching on the SAW filter output side (which does increase the number of external components), it is possible to suppress the insertion loss while at the same time making the level of the characteristics variable, which provides additional design freedom. (Refer to Fig. 13.) In addition, because the SAW (surface wave) reflection is small, ripple within the band can be kept low. (2) LiNbO3 (lithium niobate) SAW filter: ......TSF5xxx While the LiNbO3 SAW filter has a high temperature coefficient of -72 ppm/ C, it has a lower insertion loss by about 10 dB compared to the LiTaO3 SAW filters. Therefore, matching on the output side of the SAW filter is not necessary. (Refer to the diagram below.) In addition, because the insertion loss is low (although the ripple within the band is somewhat higher than in the case of the LiTaO3 SAW filter), the low impedance and small feedthrough diminish the effects of peripheral circuit components and the pattern layout, and make it possible to stabilize the trap characteristics outside of the band. From the above, it is clear that the LiTaO3 SAW filter is suitable for Japan and U.S. bands where the IF frequency is high, while the LiNbO3 SAW filter is suitable for PAL and U.S. bands where the IF frequency is low. LiTaO3 SAW Filter
LiNbO3 SAW Filter
(a) Picture wide BAND SAW Filter Japan TSF1137U U.S. TSF1241U(with IS-31 Trap) (b) INTER Carrier SAW Filter Japan TSF1138P U.S. TSF1220P
No.5177-14/15
LA7583
Test circuit Diagram
LA7583 (U.S.)
*2
*1
*1. TDK ceramic oscillator FCR5.71M2SF3 *2. Micro-inductor 5LC1R8, made by Tokyo Parts Industry Co., Ltd.
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. 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 August, 1995. Specifications and information herein are subject to change without notice.
No.5177-15/15

▲Up To Search▲

Price & Availability of LA7583

	To Download LA7583 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .