ta7678 ETC-unknow, ta7678 Datasheet

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ta7678

Manufacturer Part Number
ta7678
Description
Linear Integrated Circuit
Manufacturer
ETC-unknow
Datasheet
TA7678
LINEAR INTEGRATED CIRCUIT
VIDEO AND SOUND IF AMPLIFIER
FOR MONOCHROME TV
RECEIVERS
DESCRIPTION
The Contek TA7678 is a monolithic integrated circuit designed
for the VIF and SIF stage in B/W television receivers. The
UTC TA7678 is used for forward AGC Type.
FEATURE
VIF STAGE
*High gain wide brand IF amplifier 50dB at 45MHz
*Gain reduction with excellent stability: 55dB at 45MHz
DIP-16
*Excellent DG/DP and S/N characteristics
SIF STAGE
*Excellent limiter characteristics
*Excellent AM Rejection
*Large undistorted audio output voltage with
quadrature
detector
BLOCK DIAGRAM
Contek
Contek Microelectronics Co.,Ltd.
1
http://www.contek-ic.com E-mail:sales@contek-ic.com
CONTEK

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ta7678 Summary of contents

Page 1

... LINEAR INTEGRATED CIRCUIT VIDEO AND SOUND IF AMPLIFIER FOR MONOCHROME TV RECEIVERS DESCRIPTION The Contek TA7678 is a monolithic integrated circuit designed for the VIF and SIF stage in B/W television receivers. The UTC TA7678 is used for forward AGC Type. FEATURE VIF STAGE *High gain wide brand IF amplifier 50dB at 45MHz ...

Page 2

... TA7678 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Open Loop Voltage Video DC output current (note) Operating Temperature Storage Temperature Power dissipation ELECTRICAL CHARACTERISTICS PARAMETER CIRCUIT Recommended Supply Voltage Quiescent circuit current Video DC output Terminal 5 voltage Terminal 7 voltage RF AGC Residual Output Voltage ...

Page 3

... TA7678 LINEAR INTEGRATED CIRCUIT SIF STAGE (Ta=25 C,Vcc=12V,fo=45.75MHz,unless otherwise specified) PARAMETER CIRCUIT SIF Output Voltage Input limiting voltage AM Rejection Ratio Recovered Output Voltage Total Harmonic distortion Maximun Audi Output Voltage SIF Input Impedance Audio Output Impedance Note =11.5V,VIF Input : 45.5MHz,1kHz,30 AM Modulation. Adjust VIF input Vi level so that the detected output of AGC Pin 12 with high impedance probe will be 0 ...

Page 4

... TA7678 LINEAR INTEGRATED CIRCUIT 9. VAGC=8V. SG1 :45.75MHz(P:picture) 100mVrms, SG2:41.25MHz(S: Sound) 32mVrms(-10dB of SG1),SG3:42.17MHz(C:Chroma) 32mVrms(-10dB of SG1) 9.1. Setting VAGC so that the output Pin12 will be 3.0V DC. 9.2. Measure the level difference between the C-level and 920kHz. 10. V =8V. VIF Input : f=45.75MHz video signal (RAMP) 87.5% AM 100mVp-p. Setting ATT so that the SYNC TIP AGC level of Pin12 will be 2 ...

Page 5

... TA7678 LINEAR INTEGRATED CIRCUIT 2. AC TESTS CIRCUIT 3. VIDEO FREQUENCY RESPONSE & SIF OUTPUT VOLTAGE TEST CIRCUIT 4. INTER MODULATION TEST CIRCUIT Contek Microelectronics Co.,Ltd. http://www.contek-ic.com E-mail:sales@contek-ic.com CONTEK 5 ...

Page 6

... TA7678 LINEAR INTEGRATED CIRCUIT 5. DG,DP TEST CIRCUIT 5. INPUT IMPEDANCE TEST CIRCUIT Contek Microelectronics Co.,Ltd. http://www.contek-ic.com E-mail:sales@contek-ic.com CONTEK 6 ...

Page 7

... TA7678 LINEAR INTEGRATED CIRCUIT 7. SIF INPUT IMPEDANCE TEST CIRCUIT 8. V AMR, V ,THD V TEST CIRCUIT IN(LIM AUDIO OUTPUT IMPEDANCE TEST CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 7 ...

Page 8

... TA7678 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT Contek Microelectronics Co.,Ltd. http://www.contek-ic.com E-mail:sales@contek-ic.com CONTEK 8 ...

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