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U4270B

TEMIC Semiconductors
Part Number U4270B
Manufacturer TEMIC Semiconductors
Description FM IF limiter amplifier and detector
Published Dec 18, 2006
Detailed Description www.DataSheet4U.com TELEFUNKEN Semiconductors U 4270 B FM IF limiter amplifier and detector Description The U 4270 B ...
Datasheet PDF File U4270B PDF File

U4270B
U4270B


Overview
www.
DataSheet4U.
com 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) 6 (7) 11 (12) 15 (16) 13 (14) 12 (13) 2 ( ) SSO 20 94 8876 Rev.
A1: 07.
10.
1994 Preliminary Information 1 U 4270 B Pin description DIP 18 1 2 – 3 4 5 6 7 8 9 10 SSO 20 1 2 3 4 5 6 7 8 9 10 11 Symbol GND MUTE IN NC MUTE DE AF STOP SEN Function Ground Mute input N.
C.
Mute depth AF output Search tuning stop sensitivity STOP SIG Search stop signal output AFC AFC output RVOLT Reference voltage output DEMOD Demodulator circuit DEMOD Demodulator circuit DIP 18 11 12 13 14 15 – 16 17 18 SSO 20 12 13 14 15 16 17 18 19 20 TELEFUNKEN Semiconductors Symbol FS MPOUT RTC VS MPIN NC BFB BFB IF Function Field strength Multipath identification output Rectifier time constant Supply voltage Multipath identification input N.
C.
Bias feedback Bias feedback IF input GND MUTE IN MUTE DE AF STOP SEN STOP SIG AFC RVOLT DEMOD 1 2 3 4 5 6 7 8 9 94 8949 18 17 16 15 14 13 IF BFB BFB MPIN VS RTC GND MUTE IN NC MUTE DE AF STOP SEN STOP SIG AFC RVOLT DEMOD 1 2 3 4 5 6 7 8 9 10 94 8948 20 IF 19 BFB 18 BFB 17 NC 16 MPIN 15 VS 14 RTC 13 MPOUT 12 FS 11 DEMOD 12 MPOUT 11 FS 10 DEMOD 2 Preliminary Information Rev.
A1: 07.
10.
1994 TELEFUNKEN Semiconductors U 4270 B Absolute Maximum Ratings Reference point Pin 1, unless otherwise specified Parameters Supply voltage Junction temperature Storage temperature range A...


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