Monolithic Linear LA7555 Signal Processing (VIF+SIF) Circuit

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

Monolithic Linear LA7555 Signal Processing (VIF+SIF) Circuit

Datasheet Thumbnail

Top Searches for this datasheet

Ordering number:ENN2927
Monolithic Linear
LA7555
Signal Processing (VIF+SIF) Circuit
Overview
LA7555 full sync detection method monolithic linear using PLL. excellent 920kHz beat buzz beat characteristics, making ideal audio multiplexing high-quality equipment.
Package Dimensions
unit:mm 3067A-DIP24S
[LA7555]
21.0
7.62
Functions
section amplifier Video sync detecton Lock section limiter amplifer quadrature detection Audio section attenuator driver Muting Audio muting (pin defeat (pin Audio-Video simultaneous muting (pin
3.9max (3.25)
(0.71)
1.78
0.48
0.95
0.51min
SANYO DIP24S
Features
24-pin shrink package being smallest used ICs. Excellent 920kHz beat characteristics. Excellent buzz beat characteristics. High-gain amplifier. High-speed possible. Excellent power supply ripple characteristics.
Specifications
Maximum Ratings 25°C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol Topr Tstg
Ta50°C
Conditions
Ratings 13.8 1200 +150
Unit
Continued next page.
SANYO products described contained herein have specifications that handle applications that require extremely high levels reliability, such life-support systems, aircraft's control systems, other applications whose failure reasonably expected result serious physical and/or material damage. Consult with your SANYO representative nearest before using SANYO products described contained herein such applications. SANYO assumes responsibility equipment failures that result from using products values that exceed, even momentarily, rated values (such maximum ratings, operating condition ranges,or other parameters) listed products specifications SANYO products described contained herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
O2500TN (KT)/N078YT, No.2927-1/11
0.25
LA7555
Continued from preceding page.
Parameter Symbol V12, Circuit voltage Circuit current Conditions Ratings Unit
Note Assumes that current flowing into positive sign) current flowing negative.
Operating Conditions 25°C
Parameter Recommended supply voltage Operating voltage range Symbol Conditions Ratings 13.2 Unit
Operating Characteristics 25°C
Parameter [VIF section] Circuit current Quiescent video output voltage Maximum voltage Minimum voltage Quiescent output voltage Input sensitivity range Maximum allowable input Video output amplitude Output Sync signal voltage 920kHz beat level Frequency characteristic output signal voltage Differential gain Differential phase White noise threshold voltage White noise clamp voltage Black noise threshold voltage Black noise clamp voltage Maximum voltage Mimimum voltage detection sensitivity Input resistance Input capacitance pull-in range pull-in range pull-in range pull-in range Lock detection threshold voltage maximum variable range maximum variable range control sensitivity I6+I17 V11H V11L Vo(video) I920 Vo(SIF) VWTH VWCL VBTH VBCL V16H V16L fPU-1 fPL-1 fPU-2 fPL-2 V13TH V20=3V V20=7V V20=5V 4.6V f=58.75MHz f=58.75MHz Pin22 Vi=10mVrms, SWEEP Vi=10mVrms, SWEEP fm=15kHz, 78%AM Vi=10mV, Vi=10mV, P=0, C=-4dB, S=-14dB (2Vp-p) P=0, S=-14dB P=0, S=-20dB fp=58.75MHz, Vi=10mV, 87.5%, video signal fp=58.75MHz, Vi=10mV, 87.5%, video signal V13=11V V13=11V V13=11V V13=11V V13=11V fm=400Hz, 40%AM Pins6, Pin21 Pin11 Pin11 11.0 3.45 10.6 11.5 -0.8 11.5 -2.1 3.95 11.4 dB/µV mVrms Vp-p mVrms 12.0 1.75 kHz/mV Symbol Conditions Test Point Ratings Unit
mV/kHz
Continued next page.
No.2927-2/11
LA7555
Continued from preceding page.
Parameter [SIF section] limiting voltage detection output voltage rejection Distortion [Audio section] maximum attenuation amplifier voltage gain amplifier distortion amplifier maximum output voltage (AF) V23=8V V13=5V V23=8V, V13=5V V23=8V, V13=5V, f=400Hz
Symbol
Conditions
Test Point
Ratings -5.3 -1.8
Unit
Vi(lim) THD(Det)
V13=5V V13=5V V13=5V V13=5V
µVrms +0.4 dBs*
(AF) V23=8V, V13=5V
0dBs=0.7745Vrms Video output (pin21), output (pin16), detection output (pin1), Audio output (pin5)
Equivalent Circuit Block Diagram
No.2927-3/11
LA7555
Precautions when using LA7555
Description Operation amplifier shown Fig.1-1, amplifier consists three amplifiers directly connected with balanced input. Amplifiers gain controlled AGC.
Fig.1-1
No.2927-4/11
LA7555
Video detector shown Fig.2-1, video detector PLL-type. detection (video detection) phase shifting signal output signal 180° multiplying input signal. offers excellent buzz beat characteristics detection multiplication clean signal. Also, excellent detection characteristics obtained same manner overmodulation signal.
Fig.2-1 Video amplifier noise canceller shown Fig.3-1, video amplifier amplifies detection output voltage over wide band desired voltage (=2.2Vp-p). amplified video signal passes through noise canceller output White noise canceller operates shown Fig.3-3 input noise exceeding white level video signal shown Fig.3-2 will cause noticeable noise screen. Black noise canceller operates shown Fig.3-3 input noise exceeding sync signal shown Fig.3-2 will prevent proper operation next-stage sync separation circuit.
Fig.3-1
Fig.3-2
Fig.3-3
No.2927-5/11
LA7555
Lock detector shown Fig.4-1, lock detector time constant switching detection circuit which expands pull-in range. detection circuit operates voltage video signal. weak field detected voltage unlock state when detuned detected from video signal.
Fig.4-1 detector shown Fig.5-1, detector equipped with noise canceller function which prevents malfunction system. detection output (pin also used video output, detection output, simultaneous mute MUTE) pin.
Fig.5-1 shown Fig.6-1, controls gain tuner's amplifier. Measurement made whether region snow region (noise screen, poor ratio) saturation region (contours clearly seen look video signal distortion), delay point shown Fig6-2. also used video output, detection output, simultaneous mute MUTE) pin.
Fig.6-1
Fig.6-2
No.2927-6/11
LA7555
shown Fig.7-1, balanced-type using quadrature detection circuit. input signal shifted internal capacitor external phase shifter, quadrature-detected. also used Defeat pin. Fig.7-1
Fig.7-1 forms sound trap preventing malfunction AFT. limiting amplifier shown Fig.8-1, limiting amplifier unbalanced limiting amplifier consisting four stages derectly connected. There negative feedback within balance differential amplifier.
Fig.8-1 Quadrature detection quadrature detection single detector with internal phase shift capacitor, shown Fig.9-1. detection shifting signal multiplying characteristics phase shifting circuit follows Demodulation output mainly Distortion linearity phase shifting circuit, symmetry curve. linearity phase shifting circuit improved lowering increasing band with singletuned circuit, detection output will drop. also used mute pin.
Fig.9-1 Electronic volume control shown Fig.10-1, this electronic volume control, having control with high input impedance. attenuation curve logarithmic curve. external audio input impedance approximately 30k.
No.2927-7/11
LA7555
Fig.10-1 amplifier shown Fig.11-1, this amplifier equipped with pin. audio power amplifier easily configured this pin. gain power amplifier controlled ratio
Fig.11-1 adjustment methods following methods available adjusting VCO. voltage offset adjustment method Connect digital voltmeter (APC filter (Fig.1). Lower input level connect (pin GND. Measure voltage this time. Raise input level desired value. Free from (internal AGC). Adjust that voltage (V2) equal
Note When adjusting this method, (digital voltmeter) with high input impedance. Zi=10M, adjustment error approximately 20kHz, error with connected Fig.1 (mV)= Z+R1
change free-running frequency according where =VCO control sensitivity (kHz/mV)
Direct reading method Lower input level adjust (pin between about (VCO free run). Monitor carrier frequency leaking from pins other than coil, pattern, chassis, adjust coil obtain desired frequency (fp).
No.2927-8/11
LA7555
Measurement selectivity characteristics pull-in range PLL-type approximately ±2MHz. Thus, possible measure matching characteristics tuner filter easily with dummy syncronization detection method. following just example measure selectivity characteristics single signal. Test Circuit
Conditions Apply voltage (pin adjust until video output 0.5Vp-p. Atteach 4.7µF capacitor filter (pin that unlocked. waveform shown diagram below monitored through externally mounted detector.
Note Error will occur measurement selectivity characteristics video frequency changes between video equalizer, etc.) Externally Mounted Detector (Example)
Voltage doubler type
No.2927-9/11
LA7555
Sample Application Circuit (JAPAN)
Item
coil
coil
coil
filter
JAPAN fP=58.75MHz
square 0.12 C=24pF S-CORE HW-6226-4 MITSUMI
square 1/2t External c=91pF MA-6342 MITSUMI
square 0.08 C=100pF KS-6102-1 MITSUMI
Filter TSF1110 SANYO
fP=45.75MHz
square 0.12 C=24pF S-CORE HW-6227-4 MITSUMI
square 1/2t External c=91pF MA-6343 MITSUMI
square 0.08 C=100pF KS-6102-1 MITSUMI
Filter TSF1203 SANYO TSF1212 SANYO
fP=38.9MHz
square 0.12 C=24pF S-CORE MA-6389 MITSUMI
square 1/2t External c=91pF MA-7115 MITSUMI
Filter TSF1303 SANYO
No.2927-10/11
LA7555
Specifications SANYO products described contained herein stipulate performance, characteristics, functions described products independent state, guarantees performance, characteristics, functions described products mounted customer's products equipment. verify symptoms states that cannot evaluated independent device, customer should always evaluate test devices mounted customer's products equipment. SANYO Electric Co., Ltd. strives supply high-quality high-reliability products. However, semiconductor products fail with some probability. possible that these probabilistic failures could give rise accidents events that could endanger human lives, that could give rise smoke fire, that could cause damage other property. When designing equipment, adopt safety measures that these kinds accidents events cannot occur. Such measures include limited protective circuits error prevention circuits safe design, redundant design, structural design. event that SANYO products(including technical data,services) described contained herein controlled under applicable local export control laws regulations, such products must expor without obtaining expor license from authorities concerned accordance with above law. part this publication reproduced transmitted form means, electronic mechanical, including photocopying recording, information storage retrieval system, otherwise, without prior written permission SANYO Electric Co., Ltd. information described contained herein subject change without notice product/technology improvement, etc. When designing equipment, refer "Delivery Specification" SANYO product that intend use. Information (including circuit diagrams circuit parameters) herein example only guaranteed volume production. SANYO believes information herein accurate reliable, guarantees made implied regarding infringements intellectual property rights other rights third parties.
This catalog provides information October, 2000. Specifications information herein subject change without notice.
No.2927-11/11

Monolithic Linear LA7555 Signal Processing (VIF+SIF) Circuit

Top Searches for this datasheet

Other recent searches