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PDF D7678 Data sheet ( Hoja de datos )

Número de pieza D7678
Descripción Video and Sound IF Amplifier for Clolr and Monochrome TV Receivers
Fabricantes Shaoxing 
Logotipo Shaoxing Logotipo



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No Preview Available ! D7678 Hoja de datos, Descripción, Manual

Silicore
VIDEO AND SOUND IF AMPLIFIER FOR COLOR
AND MONOCHROME TV RECEIVERS
CHMC D7678
FUNCTION
PIF STAGE
z Three Controlled IF Amplifier stages
z Video Demodulator Controlled by Picture
Carrier
z Black Noise and White Noise Inverter
z Peak AGC
z DC Amplifier for RF AGC Output
SIF STAGE
z Three Controlled IF Amplifier Stages
z Quadrature Detector
Outline Drawing
F E AT U R E
PIF STAGE
z High Gain, Wide Band IF Amplifier : 50dB(Typ.) at 58MHz
z Gain Reduction with Excellent Stability : 55dB(Typ.) at 58MHz
z Excellent DG/DP Characteristics : DG 7%(Typ.), DP 3.5deg.(Typ.)
z Excellent S/N Characteristics Due to Delayed 3 Stage AGC Action.
z Fast AGC Action Due to Noise Inverter and Peak AGC.
z Switch Off the Video part with VTR Switch.
z Dual Differential AFT Output.
SIF STAGE
z Excellent Limiter Characteristics.
z Excellent AM Rejection.
z L a rg e U n d i s t o r t e d A u d i o O u t p u t Vo l t a g e w i t h Q u a d r a t u r e D e t e c t o r.
SHAOXING SILICORE TECHNOLOGY CO.,LTD
www. Silicore. com. cn
CHMC
1/13

1 page




D7678 pdf
Silicore
D7678
NOTE:
1 . V A G C ( T P 1 4 E X T. A p p l y i n g Vo l t a g e ) = 11 . 5 V
PIF IN; f=58.75MHz 1kHz 30% AM modulation
Adjust PIF Input Level Vi so that the detected output of TP12C with high
impedance probe will be 0.8Vp-p and measure the Input Level.
2. VAGC=4V
Measure PIF Input Level Vi’ same as NOTE 1
A=20log Vi’/Vi (dB)
3. PIF IN; f=58.75MHz CW 15mVrms
Measure DC Level of TP12A
4. PIF IN; f=58.75MHz APL 100%, 87.5% AM modulation.
TP14: open
(1) Adjust PIF Input Level 50mVp-p and measure the detected output level
V01p-p
(2) Then increase the Input Level so that detected output level will be
1.1×V01p-p and measure the Input Level
5. VAGC=8V
P I F I N ; f = 5 8 . 7 5 M H z ± 1 0 M H z Va r i a b l e o r S w e e p 1 5 m Vr ms M e a s u r e D C l e v e l o f
TP12A.
SHAOXING SILICORE TECHNOLOGY CO.,LTD
www. Silicore. com. cn
CHMC
5/13

5 Page





D7678 arduino
Silicore
6.PIF INPUT IMPEDANCE TEST CIRCUIT
VAGC=5V
Vcc=12V
Hi
R-X
METER
f=58.5MHz
16 15 14 13
12 11 10
9
12
3
4
5
6
7
8
Lo
C: 0.01uF
7.SIF INPUT IMPEDANCE TEST CIRCUIT
VAGC=5V
Vcc=12V
D7678
16 15 14 13
12 11 10
9
12
3
4
5
6
7
8
R-X Hi
METER
f=4.5MHz
Lo
C: 0.01uF
SHAOXING SILICORE TECHNOLOGY CO.,LTD
www. Silicore. com. cn
CHMC
11/13

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