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TELEFUNKEN Semiconductors

U4240B

AM-Receiver

Description

The U4240B is a bipolar integrated AM receiver circuit.

It performs all the active functions and part of the filtering

required of the AM radio receiver. The device is designed

for car radio and home receiver applications.

Features

D

ESD protected

D

IF output for stereo demodulator and

stop signal generation

D

IF amplifier with gain control

D

Balanced full-wave detector

D

Audio preamplifier

D

Internal AGC voltage

D

Amplifier for field-strength indication

D

Electronic standby ON/ OFF switch

D

D

D

D

AF preamplifier with simple filtering

Controlled RF preamplifier

Double balanced mixer

Separate oscillator with amplitude control

Block Diagram

AM-antenna

tank

17 (19)

16 (17)

AM-oscillator

tank

14 (15)

13 (14) 12 (13)

170

W

Controlled

RF

preamplifier

5 k

W

5 k

W

Internal

supply

voltage

Controlled

oscillator

150

W

11 (12)

10 (11)

50

W

GND

18 (20)

V

S

15 (16)

Indicator

driver

Balanced

mixer

Standby

switch

Controlled

IF amplifier

Balanced

full-wave

detector

AF

amplifier

Control

voltage

amplifier

7 k

W

7 k

W

7 (8)

AM-IF

output

3.5 k

W

12 k

W

1 (1)

2 (2)

IF BPF

3 (4)

4 (5)

( ) SSO 20

5 (6)

6 (7)

8 (9)

9 (11)

93 7715 e

Figure 1.

Rev. A1: 12.07.1995

1 (8)

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U4240B相關(guān)型號PDF文件下載

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  英文版
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  英文版
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