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TCA270<br />

SYNCHRONOUS DEMODULATOR<br />

AGC<br />

V ..,(pin 4) Saturation voltage <strong>of</strong> tuner<br />

control at .10ma ........ +O.3V<br />

V .. (pin 5) Saturation voltage <strong>of</strong> IF<br />

control at 10mA .. O.7min, 1.2max V<br />

VUlt Breakdown voltage at<br />

1mA (pin 4 & 5) ........ 14min V<br />

10 Control current<br />

(pin 4 & 5) .......... 10min mA<br />

Signal expansion for complete<br />

AGC ................ O.5max dB<br />

AGC gating (optional) by<br />

negative line fly back pulse<br />

V; .............. 2min, Vsmax V<br />

R; ....................... 1.BKn<br />

Cu rrent ratio <strong>of</strong> unsatu rated<br />

outputs 14/15 for<br />

I,=1mA .................. 6min<br />

Fig. 4-Typical Application<br />

vcc<br />

TUNER<br />

RFSTAGE<br />

1.2K.n<br />

12V<br />

330.n.<br />

80jlF I 33011<br />

1<br />

I.F. CONTROL STAGE<br />

AFC<br />

Output control voltage swing<br />

(pk-pk) ........................ 10minV<br />

Change <strong>of</strong> frequency for complete<br />

output voltage swing ........ 400maxKHz.<br />

Change <strong>of</strong> frequency to maintain<br />

peak output voltage .......... ±1 min MHz.<br />

Noise Inverters (see note 2)<br />

Negative going noise pulses in pin 9<br />

inversion threshold ... ; ........... ±2.55V<br />

Positive going noise pulses in pin 9<br />

inversion threshold ................ ±6.6V<br />

NOTES<br />

1. CC1 R system <strong>of</strong> modulation, peak white=<br />

10 % carrier<br />

2. Noise pulses are inverted to a point near<br />

black level<br />

7.<br />

0<br />

5. 0<br />

2. 5<br />

V '\<br />

k -<br />

5<br />

-c<br />

............<br />

l'----U<br />

2e 0 Z5 50 75 PO 1.5<br />

Fig. 5-Transfer Characteristic<br />

VI5<br />

2345678<br />

TCA270<br />

'\..r<br />

OPTIONAL<br />

r---oO LINE GATING<br />

NC<br />

..........<br />

16<br />

r--r-.....-'"tc-=-_<br />

15 14 13 12<br />

.......<br />

II -,.;-.-1-l-___________ 6V<br />

'------

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