Datasheet Summary
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TELEFUNKEN Semiconductors
U 4270 B
FM IF limiter amplifier and detector
Description
The U 4270 B is an integrated bipolar FM-IF amplifier circuit with field strength indicator, stop signal generator, multipath detector and controllable mute function. It is designed for car radios and home receiver applications.
Features
D 7 stage limiter amplifier D Multipath signal detector D Stop signal generator with controllable threshold D Signal strength output D Controllable mute function D High signal/noise ratio and low signal distortion
Block Diagram
R3
1 14 (15) 9 (10) 10 (11)
Mute depth control
3 (4) 4 (5) 8 (9)
18(20) (19) 17
(8) 7
16 (18)
5 (6)
(7)
11...