TDA1576T データシートの表示（PDF） - Philips Electronics

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TDA1576T

FM-IF amplifier/demodulator circuit

Philips Electronics 

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2 V (RMS) RS

ViIF RS

0.1 µF

GND VFB1

20 19

0.1 µF

VFB2

18

zero adjustment

of

field strength

indicator

ViIF

VF0

17

16

1 mA

field strength

detune

voltage

3.6 kΩ

1 nF

reference

voltage

+4.9 V

0.47 µF

VF

Vref

Vo(det)

15

14

13

Vi(det) n.c.

12

11

25

kΩ

25

kΩ

4-STAGE

LIMITER/

AMPLIFIER

TDA1576T

V1

V2

8.3 kΩ

1

VP

10 Ω +8.5 V

VP

0.1 µF

2

CPS

47 µF

3

IF1

33 pF

560 pF

LEVEL DETECTOR

REFERENCE

VOLTAGE

MUTE

ATTENUATOR

0.5

DETUNE

mA DETECTOR

QUADRATURE

DEMODULATOR

V2

3.7 kΩ 3.7 kΩ

4

5

6

7

RES1 FMON RES2 IF2

FM

on

33 pF

8

VoAF1

9

VoAF2

6.8 nF

QL = 20

fo = 10.7 MHz

audio

VAF outputs −VAF

10

n.c.

MEH139

Fig.1 Block diagram.

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