TB1254N Просмотр технического описания (PDF) - Toshiba

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производитель

TB1254N

PAL / NTSC / SECAM 1CHIP (IF+VCD PROCESSOR) IC

Toshiba 



 

TERMINAL INTERFACE

PIN NAME

FUNCTION

1 IF VCC

2 RIPPLE

FILTER

A Vcc terminal for the IF circuit.

Supply 5V.

A terminal to be leaded to an internal bias

filter. Put a capacitor.

INTERFACE

•

1

1kĦ

330Ħ 2kĦ

2

330Ħ

27.5kĦ

3 SIF OUT

An output terminal for a 1st SIF signal, that

beaten down by a regenerated carrier.

The SIF frequencies are able to convert into

only 6.5MHz, in order to eliminate SIF BPFs

to single 6.5MHz.

45kĦ

100Ħ

5

9V 14

500Ħ

15kĦ

3

16kĦ

16.3kĦ

4 AUDIO OUT

5 IF GND

6 IF IN

7 IF IN

An output terminal for audio signal.

FM Det.signal or the external audio signal,

input to pin53, is output (Switched by bus).

An internal audio attenator controles the

output levelS. •

4

5

100Ħ

9V 14

ATT

50kĦ

The GND terminal for IF circuit.

Input terminals for IF signals. Pin 6 and 7 are

the both input poles of a differential amplifier.

The norminal input level is 90dB(•V)(Pin6-7),

input impedance is 1.5 k ohms.

6

30kĦ

5.3V

5

•

1

100kĦ

8 NC

7

1.44kĦ

1.44kĦ

1.5V

2.75V

5

-

Ver3.7

00/01/28 3

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