View TA7678_135671.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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 *Excellent DG/DP and S/N characteristics
DIP-16
SIF STAGE
*Excellent limiter characteristics *Excellent AM Rejection *Large undistorted audio output voltage with detector quadrature
BLOCK DIAGRAM
Contek
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
1
TA7678
PARAMETER
Supply Voltage Open Loop Voltage Video DC output current (note) Operating Temperature Storage Temperature Power dissipation
LINEAR INTEGRATED CIRCUIT
C)
ABSOLUTE MAXIMUM RATINGS(Ta=25
Vcc V4
SYMBOL
VALUE
15 15 6 -20 to +65 -55 to 155 1.4
UNIT
V V V C C W
V12 Topr Tstg PD
ELECTRICAL CHARACTERISTICS(Ta=25
PARAMETER
Recommended Supply Voltage Quiescent circuit current Video DC output Terminal 5 voltage Terminal 7 voltage RF AGC Residual Output Voltage RF AGC Leak Current Video sensitivity AGC Range Sync Tip Level Voltage (pin12) Maximum IF Input Voltage White Noise Threshold (pin12) White Noise Clamp Level (pin12) Black Noise Threshold (pin12) Black Noise Clamp Level (pin12)
Video Frequency Response Suppression of carrier Suppression of 2 nd
C,Vcc=12V,fp=45.75MHz,unless otherwise specified)
TEST CIRCUIT
1 1 1 1 1 1 2 2 2 2 2 2 2 2
3 4
SYMBOL
Vcc Iccq V12 V5 V5 V4(sat) I4(leak) SVI VAGC(IF) Vsync (pin12) VI(MAX) VWTH (pin12) VWCL (pin12) VBTH (pin12) VBCL(pin12)
Gv(IF) CL
TEST CONDITIONS
MIN. TYP. MAX. UNIT
10.8 12 50 5.5 4.4 6.0 13.2 65 5.8 5.3 7.2 0.5 1 60 60 2.3 100 5.8 3.7 1.4
2.9 4.5 40
V mA V V V V mA mVrms dB V mVrms
S1:ON,S3:2,S5:2,S4:1 S1:OFF,S3:2,S5:2,S4:1 S1:ON,S3:2,S5:2,S4:1 S1:ON,S3:2,S5:2,S4:1 S1:OFF,S3:2,S5:2,S4:1 S1:OFF,S3:1,S5:2,S4:1 Note 1 Note 2 Note 3 Note 4 Note 5 Note 5 Note 5
Note 5 Note 6 Note 7
35 5.2 3.5 4.6
150 64 2.5 120 6.2 4.1 1.6
3.3 5.5 50
250 2.7
6.6 4.5 1.8
3.7
V V V
V MHz dB
Carrier
4 4 5 5 6 1 2 2
I2nd I920 DG DP RIN CIN I4(MAX) Vin(delay) Vo0
Note 8 Note 9 Note 10 Note 10 Note 11 Note 12 Note 13 Note 14
40 33
50 38 7 3.5 10 5 6.0 10.0 9.0 2.75
dB dB dB
920kHz Beat level Differentital Gain Differential Phase VIF Input Impedance Maximum Avaliable Current RF AGC delay Point Range Video output level
C
k pF mA V V
1.5 7 5.0 2.25
3.0 3.0 7.0 2.5
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
2
TA7678
SIF STAGE
PARAMETER
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
LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT
3 8 8 8 8 8 7 9
(Ta=25 C,Vcc=12V,fo=45.75MHz,unless otherwise specified)
SYMBOL
VSO Vi(lim) AMR VOD THD VOM RIN(SIF) CIN(SIF) RO(AF)
TEST CONDITIONS
Note 15 Note 16 Note 17 Note 18 Note 18 Noet 19
MIN. TYP. MAX. UNIT
200 200 40 0.5 4.0 10 20 3 15 30 10 20 400 400 45 0.75 1.0 2.0 600 mVrms mVrms dB Vrms % Vp-p kW pF kW
Note 20
10
Note:
1. 2. 3. 4. 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. VAGC=4V. Measure VIF input level vi is same as note 1 DA=20log(Vi /Vi)(dB) VIF input : f=45.75MHz CW 15mVrms. Measure the DC level of Pin12. 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. 8.
SG1:45.75MHz, 1kHz 80% AM Modulation 100mVrms. SG2 ,SG3:OFF. Setting VAGC so that the output AC Measure 2 level of Pin12 will be 2.7Vp-p. Measure CL of Pin12 after setting to 0% AM of SG1. nd of Pin12 same as note 9.
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
3
TA7678
9.
LINEAR INTEGRATED CIRCUIT
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. 11. 12. 13.
VAGC=8V. VIF Input : f=45.75MHz video signal (RAMP) 87.5% AM 100mVp-p. Setting ATT so that the SYNC TIP level of Pin12 will be 2.5VDC measure DP and DG. VAGC=5V. f=45.75MHz. Measure RIN and CIN. S1=ON, S3=2,S5=1,S4=2 Pin 14 open. VIF Input : 45.75MHz CW 20mVrms. 13.1. Adjust the voltate of Pin 3 so that the voltage of Pin4 will be 6.0V DC. 13.2. Measure the Pin 3.
14. 15. 16.
Pin 14 open. VIF Input: 45 .75MHz 100% APL 87.5% AM Modulation signal amplitude 50mVp-p detected output voltage (white peak to SYNC TIP)
mesure the
PIN14: Op en. SG1 :45.75MHz CW 100mvrms. SG2 :41.25MHz CW 25mVrms. Measre SIF(4.5MHz) output voltage at Pin12. SIF input: f=4.5MHz FM fMOD=400Hzm Df=+-25kHz Vos and measure the 16.1. Adjust SIF input level 100mVp-p and measure the detected output level Vos. 16.2. Then decrease the i nput level so that the detected output level will be 3dB down of input level.
17. 18. 19. 20.
SIF input: f=4.5MHz, FM fMOD=400Hz SIF input: f=4.5MHz, fM fMOD=400Hz
Df=+-25kHz. AM 30%,input level Vins=80dB m. Df=+-25kHz. Input level Vins=80dB m Df=+-25kHz, input level Vins=80dB m.
SIF input: f=4.4~4.6MHz variable or sweep measure the outjput DC voltage change. SIF inptut : f=4.5MHz, FM FMOD=400Hz 20.1. Measure the detected output voltagae vOA with Rx= . 20.2. Then, adjust Rx so that the d etected output voltage will be VOA/2 and measure Rx.
1. DC TEST CIRCUIT
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
4
TA7678
2. AC TESTS CIRCUIT
LINEAR INTEGRATED CIRCUIT
3. VIDEO FREQUENCY RESPONSE & SIF OUTPUT VOLTAGE TEST CIRCUIT
4.
INTER MODULATION TEST CIRCUIT
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
5
TA7678
5. DG,DP TEST CIRCUIT
LINEAR INTEGRATED CIRCUIT
5.
INPUT IMPEDANCE TEST CIRCUIT
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
6
TA7678
LINEAR INTEGRATED CIRCUIT
7. SIF INPUT IMPEDANCE TEST CIRCUIT
8. VIN(LIM) AMR, VOD,THD VOM TEST CIRCUIT
9. AUDIO OUTPUT IMPEDANCE TEST CIRCUIT
UTC
UNISONIC TECHNOLOGIES CO., LTD.
7
TA7678
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
Contek Microelectronics Co.,Ltd.
CONTEK
http://www.contek-ic.com E-mail:sales@contek-ic.com
8

▲Up To Search▲

Price & Availability of TA7678

	To Download TA7678 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .