TA7678 データシートの表示（PDF） - Contek Microelectronics

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TA7678

VIDEO AND SOUND IF AMPLIFIER FOR MONOCHROME TV RECEIVERS

Contek Microelectronics 

TA7678

LINEAR INTEGRATED CIRCUIT

SIF STAGE (Ta=25 C,Vcc=12V,fo=45.75MHz,unless otherwise specified)

PARAMETER

TEST SYMBOL TEST CONDITIONS

CIRCUIT

SIF Output Voltage

3

VSO Note 15

Input limiting voltage

8

Vi(lim) Note 16

AM Rejection Ratio

8

AMR Note 17

Recovered Output Voltage

8

VOD Note 18

Total Harmonic distortion

8

THD Note 18

Maximun Audi Output Voltage

8

VOM Noet 19

SIF Input Impedance

7

RIN(SIF)

CIN(SIF)

Audio Output Impedance

9

RO(AF) Note 20

MIN. TYP. MAX. UNIT

200 400 600 mVrms

200 400

mVrms

40 45

dB

0.5 0.75

Vrms

1.0 2.0 %

4.0

Vp-p

10 20 30 kW

3 10 pF

10 15 20 kW

Note:

1. VAGC=11.5V,VIF Input : 45.5MHz,1kHz,30 AM Modulation. Adjust VIF input Vi level so that the detected output of

Pin 12 with high impedance probe will be 0.8Vp-p and measure the input Level.

2. VAGC=4V. Measure VIF input level vi is same as note 1 DA=20log(Vi /Vi)(dB)

3. VIF input : f=45.75MHz CW 15mVrms. Measure the DC level of Pin12.

4. VIF Input : f=45.75MHz APL 100%.87.5% AM Modulation. Pin 14 Open

4.1. Adjust VIF inpt level 50mVp-p and measure the detected output level Vo(p-p)

4.2. Then increase the input level so that the detected output level will be 1.1* Vo(p-p) and measure the input

level.

5. VAGC=8V. VIF input : f=45.75MHz+-10MHz variable or sweep 15mVrms measure DC level of Pin12.

6. VAGC=8V. SG1:45.75MHz CW. SG2:45.65~27MHz variable.

6.1. Setting output of SG1 s o that the DC level of Pin12 will be

6.2. Setting output of SG1(45.65MHz so that the AC level of Pin12 will be 0.5Vp-p.

6.3. Decreasing frequency of SG2 until the AC level of Pin 12 will be 0.35vp-p(-3dB of 0.5Vp-p) then read

FSG2=F, fBW=45.75-F MHZ

7. SG1:45.75MHz, 1kHz 80% AM Modulation 100mVrms. SG2 ,SG3:OFF. Setting VAGC so that the output AC

level of Pin12 will be 2.7Vp-p. Measure CL of Pin12 after setting to 0% AM of SG1.

8. Measure 2nd of Pin12 same as note 9.

Contek Microelectronics Co.,Ltd.

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http://www.contek-ic.com E-mail:sales@contek-ic.com

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