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Silicore
VIDEO AND SOUND IF AMPLIFIER FOR COLOR AND MONOCHROME TV RECEIVERS CHMC
FUNCTION P I F S TA G E
Three Controlled IF Amplifier stages Vi d e o D e m o d u l a t o r C o n t r o l l e d b y P i c t u r e Carrier Black Noise and White Noise Inverter Peak AGC DC Amplifier for RF AGC Output
D7678
S I F S TA G E
Three Controlled IF Amplifier Stages Quadrature Detector Outline Drawing
F E AT U R E P I F S TA G E
H i g h G a i n , Wi d e B a n d I F A m p l i f i e r : 5 0 d B ( Ty p . ) a t 5 8 M H z G a i n R e d u c t i o n w i t h E x c e l l e n t St a b i l i t y : 5 5 d B ( Ty p . ) a t 5 8 M H z E x c e l l e n t D G / D P C h a r a c t e r i s t i c s : D G 7 % ( Ty p . ) , D P 3 . 5 d e g . ( Ty p . ) Excellent S/N Characteristics Due to Delayed 3 Stage AGC Action. Fast AGC Action Due to Noise Inverter and Peak AGC. S w i t c h O f f t h e Vi d e o p a r t w i t h V T R S w i t c h . Dual Differential AFT Output.
S I F S TA G E
Excellent Limiter Characteristics. Excellent AM Rejection. 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
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PIN CONNECTION
D7678
IF IN 1 FIL 2 RFAGC CON 3 RFAGC OUT 4 SIF IN 5 SIF TA 6 OUT AF 7 IF TA 8
9 IF TA 10 SIF TA 11 Vcc 12 VF OUT 13 GND 14 AGC FIL 15 FIL 16 IF IN
BLOCK DIAGRAM
11 5 6
BIAS CIRCUIT LIMITER 15 16 1 2 1nd IF 2nd IF 3nd IF LIMITER
SOUND DET
7 10 9
VIDEO AMP
8
4 AGC3
AGC2 AGC1 NOISE INVERTER
12 13
3
14
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M A X I M U M R AT I N G S ( Ta = 2 5 ae
CHARACTERISTIC S u p p l y Vo l t a g e O p e n L o o p Vo l t a g e Vi d e o D C O u t p u t C u r r e n t Power Dissipation A m b i e n t Te m p e r a t u r e St o r a g e Te m p e r a t u r e ( P i n 11 ) (Pin 4) (Pin 12) (note)
D7678
)
SYMBOL Vcc V4 I1 2 PD Ta Ts t g R AT I N G 15 15 6 1.4 -20~65 ae ae -55~150 UNIT V V mA W
E L E C T R I C A L C H A R A C T E RI S T I C S PI F S TA G E ( Ta = 2 5 ae , Vc c = 1 2 V,f p = 5 8 . 7 5 M H z, f s = 5 4 . 2 5 M H z)
SYMBOL Vcc ( V 11 ) Icc ( I 11 ) V12 V5 V7 V4 S AT I4 LEAK Vi Pin1-16 | A (IF) VSYNC (V12) VIN MAX PIF Vw TH (V12) Vw CL (V12) VB TH (V12) TEST CIRCUIT 1 1 1 1 1 1 2 2 2 2 2 2 2 TEST CONDITION S1:ON, S3:2, S5:2, S4:1 S 1 : O F F, S 3 : 2 , S5:2, S4:1 S1:ON, S3:2, S5:2, S4:1 S1:ON, S3:2, S5:2, S4:1 S 1 : O F F, S 3 : 2 , S5:2, S4:1 S 1 : O F F, S 3 : 2 , S5:2, S4:1 (Note 1) (Note 2) (Note 3) (Note 4) (Note 5) (Note 5) (Note5)
CHARACTERISTIC Recommended S u p p l y Vo l t a g e Supply Current VIDEO DC Output Vo l t a g e Te r m i n a l Vo l t a g e 5 Te r m i n a l Vo l t a g e 7 RF AGC Residual O u t p u t Vo l t a g e RF AGC Leak Current Vi d e o S e n s i t i v i t y AGC Range S y n c Ti p L e v e l Vo l t a g e Maximum IF Input Vo l t a g e White Noise Threshold White Noise Clamp Level Lack Noise Threshold
MIN. 10.8 35 5.2 3.5 4.8 60 60 2.3 100 5.8 3.7 1.4
T Y P. M A X . 12.0 50 5.5 4.4 6.0 150 64 2.5 120 6.2 4.1 1.6 13.2 65 5.8 5.3 7.2 0.5 1
UNIT V mA V V V V |I A Vr m s dB V m Vr m s V V V
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2 5 0 |I 2.7 6.6 4.5 1.8
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E L E C T R I C A L C H A R A C T E RI S T I C S PI F S TA G E ( Ta = 2 5 ae
CHARACTERISTIC Black Noise Clamp Level Vi d e o F r e q u e n c y Response Suppression of carrier Suppression of 2nd carrier Suppression of Sound Carrier/Color Sub-carrier Differential Phase Differential Gain PIF Input Impedance M a x . Av a i l a b l e C u r r e n t RF AGC Delay Point Range Vi d e o O u t p u t L e v e l S I F O u t p u t Vo l t a g e
D7678
CONTINUE
, Vc c = 1 2 V,f p = 5 8 . 7 5 M H z, f s = 5 4 . 2 5 M H z)
SYMTEST BOL CIRCUIT VB CL 2 (V12) fBW CL I2nd I920 DP DG RIN(PIF) CIN(PIF) I4 MAX VIN D E L AY VOUT SOUT 3 4 4 4 5 5 6 1 2 2 3 TEST M I N . T Y P. M A X . U N I T CONDITION (Note 5) (Note 6) (Note 7) (Note 8) (Note 9) (Note 10) (Note 10) ( N o t e 11 ) (Note 12) (Note 13) (Note 14) (Note 15) 2.9 4.5 40 40 33 1.5 7.0 5.0 2.25 200 3.3 5.5 50 50 38 3.5 7 3.0 3.0 7.0 2.5 400 3.7 5 10 6.0 10.0 9.0 2.75 600 V MHz dB dB dB deg % k | pF mA V V m Vr m s
S I F S TA G E
CHARACTERISTIC I n p u t L i m i t i n g Vo l t a g e AM Rejection Ratio Recovered Output Vo l t a g e To t a l H a r m o n i c Distortion Max. Audio Output Vo l t a g e SIF Input Impedance Audio Output Impedance TEST SYMTEST M I N . T Y P. M A X . U N I T BOL CIRCUIT CONDITION VIN(LIM) 8 (Note 16) 200 4 0 0 |I Vr m s (Note 17) AMR 8 40 45 dB R D = R L = (Note 18) 8 0.5 0.75 Vr m s VOD R D = R L = (Note 18) 1.0 2.0 % THD 8 R D = R L = VOM RIN CIN
(SIF) (SIF)
8 7 9
(Note 19)
4.0 10.0 -
20.0 3.0 15.0
30.0 10.0 20.0
Vp-p k | pF k |
RO(AF)
(Note 20)
10.0
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NO T E :
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
D7678
A d j u s t P I F I n p u t L e v e l Vi s o t h a t t h e d e t e c t e d o u t p u t o f T P 1 2 C w i t h h i g h impedance probe will be 0.8Vp-p and measure the Input Level. 2. VAGC=4V M e a s u r e P I F I n p u t L e v e l Vi ' s a m e a s N O T E 1 A = 2 0 l o g Vi ' / Vi ( d B ) 3 . P I F I N ; f = 5 8 . 7 5 M H z C W 1 5 m Vr m s 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 1.1xV01p-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 m s M e a s u r e D C l e v e l o f TP12A.
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6. VAGC=8V (GR30dB) SG1 ; 58.75MHz CW S G 2 ; 5 8 . 6 5 ~ 4 0 M H z Va r i a b l e (1) Setting output of SG1 so that DC level of TP12A will be 4.0V
D7678
(2) Setting output of SG2(58.65MHz) so that AC level of TP12A will be 0.5Vp-p (3) Decreasing Frequency of SG2 until AC level of TP12A will be 0.35Vp-p (-3dB of 0.5Vp-p) then read fSG2=F fBW=58.75-F MHz
7 . S G 1 ; 5 8 . 7 5 M H z , 1 k H z 8 0 % A M m o d u l a t i o n 1 0 0 m Vr e m s SG2, SG3 ; OFF Setting VAGC so that output AC level of TP12A will be 2.7Vp-p Measure CL of TP12A after setting to 0% AM of SG1 8. Measure I2nd of TP12A same as NOTE 9 9. VAGC=8V S G 1 ; 5 8 . 7 5 M H z ( P ; P i c t u r e ) 1 0 0 m Vr m s S G 2 ; 5 4 . 2 5 M H z ( S ; S o u n d ) 3 2 m Vr m s ( - 1 0 d B o f S G 1 ) S G 3 ; 5 5 . 1 7 M H z ( c ; c h r o m a ) 3 2 m Vr m s ( - 1 0 d B o f S G 1 ) (1) Setting VAGC so that the output tip level (lower) of TP12A will be 3.0V DC (2) Measure the level difference (dB) between c-level and 920kHz level 10. VAGC=8V P I F I N ; f = 5 8 . 7 5 M H z Vi d e o S i g n a l ( r a m p ) 8 7 . 5 % A M 1 0 0 m V p - p S e t t i n g AT T s o t h a t t h e s y n c t i p l e v e l o f T P 1 2 A w i l l b e 2 . 5 V D C Measure DP and DG 1 1 . V A G C = 5 V, f = 5 8 . 7 5 M H z Measure RJN ,CIN 12. S1: ON, S3: 2, S5: 1, S4: 1 13. TP14: Open P I F I N ; 5 8 . 7 5 M H z C W 2 0 m Vr m s (1) Adjust the voltage of terminal 3 so that the voltage of terminal 4 will be 6.0V DC (2) Measure the terminal voltage 3
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6/13
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14. TP14: Open
D7678
PIF IN ; 58.75MHz 100% APL 87.5% AM modulation Signal Amplitude 50Vp-p M e a s u r e d e t e c t e d o u t p u t v o l t a g e ( W h i t e p e a k t o s y n c Ti p ) 15. TP14: Open S G 1 ; 5 8 . 7 5 M H z C W 1 0 0 m Vr m s S G 2 ; 5 4 . 2 5 M H z C W 2 5 m Vr m s Measure SIF (4.5MHz) output voltage at TP12A 16. SIF IN ; f=4.5MHz FM fMOD=400Hz f=25kHz (1) Adjust SIF Input Level 100mVp-p and measure the detected output level Vo s (2) Then decrease the Input Level so that the detected output level will be 3dB down of VOD and measure the Input Level 17. SIF IN ; f=4.5MHz FM : fMOD=400Hz f=25kHz FM : fMOD=400Hz f=25kHz AM 30% Input Level VINS=100dB 18. SIF IN ; f=4.5MHz Input Level VINS=80dB 1 9 . S I F I N ; f = 4 . 4 ~ 4 . 6 M H z Va r i a b l e o r S w e e p Measure the output DC voltage change 20. SIF IN; f=4.5MHz FM : fMOD=400Hz f=25kHz Input Level VINS=80dB ( 1 ) M e a s u r e t h e d e t e c t e d o u t p u t v o l t a g e V O I w i t h R X = (2) Then , adjust RX so that the detected output voltage will be VOI/2 and measure RX.
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7/13
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TEST CIRCUIT 1.DC TEST CIRCUIT
D7678
5.1K
3.3K 1 SW4 820K 2
3.9K 1.6K A 47uF 12V
16
15
14
13
12
11
10
9
SW1
1
2
3
4
5
6
7 1000pF
8
C=0.01uF A
2 SW5 1
1.6K 100 2 1 SW3 15V or 12V
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8/13
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2.AC TEST CIRCUIT
D7678
_+ Vcc=12.0V 0.01uF C15 C16 47uF D01 LED R15 1.5K TRF 6002 TRF1027 VIDEO 10 9 4 100pF RD 3 SIF SW
C14 0.22uF TP14 0.01uF C05
VIDEO OUTPUT TP12A
100K TP12C R12 1.6K
0.01uF 12
R11 820K
16
15
14
13
0.001uF
C04 3.9K 75pF 6 1 2 3 4 5 0.01uF 1K 6 7 8
C12 11
1
0.01uF 50 TP15 AGC 1.6K 0.1uF R9 1K 5K R1S1 VR AGC 51
0.01uF
PIF INPUT
1000pF
SIF INPUT
AF OUT
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9/13
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CIRCUIT
D7678
3 . VIDEO FREQUENCY RESPONSE & SIF OUTPUT VOLTAGE TEST
SG1 50 Pad SG2 Fig. PIF IN CIRCUIT TP12A MON. SCOPE
4 . I N T E R M O D U L ATI O N T E S T CI R C UI T
SG1 58.75MHz SG2 54.25MHz SG3 55.17MHz 25 25 25 25 ATT PIF IN Fig.4 CIRCUIT TP12A MON.SCOPE SPECTRUM ANALYZER
5.DC,DP TEST CIRCUIT
DG DP MEASURING EQUIPMENT SINGAL OUT SIGNAL IN TP12A SG & MODULATOR fo=58.75MHz ATT PIF IN Fig.4 CIRCUIT
VIDEO OUT
MON.SCOPE
APL=50% ATT:ADJUST SYNC TIP LEVEL to DC2.5V
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10/13
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6.PIF INPUT IMPEDANCE TEST CIRCUIT
VAGC=5V Vcc=12V
D7678
Hi R-X METER f=58.5MHz 16 15 14 13 12 11 10 9
1 Lo
2
3
4
5
6
7
8
C: 0.01uF
7.SIF INPUT IMPEDANCE TEST CIRCUIT
VAGC=5V Vcc=12V
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
Hi R-X METER f=4.5MHz Lo
C: 0.01uF
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11/13
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8 . V I N ( L I M ) , AM R , VO D , TH D , V O M T E S T CI R C U I T
D7678
SIF INPUT FM AM SG ATT 0.01uF Fig.4 CIRCUIT
AF OUT
V.V
RL
DISTOR TION METER
9.AUDIO OUTPUT IMPEDANCE TEST CIRCUIT
SIF INPUT FM Fig.4 CIRCUIT
AF OUT V.V Rx
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12/13
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A P P L I C ATI O N C I R C U I T
AUDIO
D7678
Vcc=12V
TRF6002
100pF
TRF1027
58.75MHz TANK
SW
OUT 1K 24pF 24pF 1000pF
4.5MHz TANK
75pF 1.0uF 0.01uF 3.9K 9 8 6 7
0.01uF
47uF 2.4K
11 10
VIDEO OUT
1K 16 15 14 13 12 5
0.22uF
4
4.5MHz FILTER 0.01uF 220 1K RF AGC OUTPUT
820K 0.01uF
1000pF 820
TRF1029 F10213 1K 10K VR 2.2uF 0.01uF 330
0.01uF TRF9223 Q25uH Q33uH TRF9224 FROM TINER RF OUTPUT 0.01uF 100K 390
5.6K
2SC388A
33 1.5K
1
2
3
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