TDA4420 ,VISION IF SYSTEM WITH AFCBLOCK DIAGRAM
TO tUNER -
VOLIAGE
SMBILIIER
comnm
v0; TAGE
AMPLIFIER
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..
TDA4427 ,VIDEO IF Amplifier with Demodulator and AFCr SGS-nm ON
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TDA4426
TDA4427
VIDEO F AMPLIFIER WITH DEMODULAT ..
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TDA4420
VISION IF SYSTEM WITH AFC
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717 mngmmmflhflgmg TDA4420
VISION IF SYSTEM WITH AFC
u HIGH GAIN-HIGH STABILITY - AGC amplifier for tuner drive with variable
a VERY LOW INTERMODULATION PRODUCTS delay
a MINIMUM DIFFERENTIAL ERROR - phasecomparatorforAFCcurrentgeneration
n CONSTANT INPUT IMPEDANCE INDEPEN- - electronic AFC switch, controlled by a DC
DENT OF AGC threshold detector
n FAST AGC GATING-ACTION, LARGELY INDE- - thermally compensated push-pull AFC output
PENDENT OF PULSE SHAPE AND AMPLI- stage.
n ADJUSTABLE WHITE LEVEL
tt LARGE AFC OUTPUT CURRENT SWING
(push-pull output)
a SWITCHABLE AFC
DESCRIPTION
The TDA4420 is a monolithic integrated circuit in 18
lead dual in-line plastic package. The functions in-
corporated are :
- gain controlled vision IF amplifier
- video demodulator controlled by picture car-
rier ORDER CODE : TDA4420
- AGC detector with gating facility
DlP-18
CONNECTION DIAGRAM (top view)
INPUT f 1 us) INPUT
DECOUPLING DecouprG
GROUND f 3 Isl AFC OUT
AGC TIME 4 os) SUPPLY
CONSTANT VOLTAGE
TUNER AGC 5 u. Pogllglgg
OUTPUT OUTPUT
NEGATIVE
(TJUNER AGC 6 13] VIDEO
ELAY OUTPUT
FLYBACK
PULSE INPUT 7 12]WH|TE LEVEL
CARRIER CARRIER
TUNING [8 11] TUNiNG
AFC t AFC
TUNING 9 10] TUNING
S-6026
October 1988 1/7
TDA4420
BLOCK DIAGRAM
m -t, 'o"""-r'J-,
i) M AFC swulcn
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'5 It ' ' '0
'-- .. A_ 4 If . >
VOLIAGE I
sumulcn AFC t6 AFC WTPUY
9‘ I---"
1 DISCRIMIM'DR
J. 4. >
,_,__ -
FROM INPUT l IF IF IF
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m "v",
1 now F--- 1 > Dos
k now - - 2‘, - um wow
D£MODULAIon m > OUIPUIS
Cs NEG
conmm AM
' mussnow F----. <
10 man - - VON“: GAIING
l AMPUFIEQ ANPLWIER
s L I: I ,
'UNER not T h mm:
lmzsnoLo __. LEVEL
common i I I a man
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
Vs Supply Voltage (pin 15) 15 V
vs Voltage at Pin 5 15 V
113, I14 Video DC Output Current 5 mA
Ptat Total Power Dissipation at Tamb s 70 °C 1 W
Tsto, Tj Storage and Junction Temperature - 40 to 150 °C
THERMAL DATA
Ru, j-amb Thermal Resistance Junction-ambient Max 80 °C/W
Cai' SGS-THOMSON
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