U4270B-CFSG3 datasheet(5/7 Pages) TEMIC

Part #	U4270B-CFSG3

Description	FM IF limiter amplifier and detector

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Manufacturer	TEMIC [TEMIC Semiconductors]

Direct Link	http://www.temic.de

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TELEFUNKEN Semiconductors

U 4270 B

Preliminary Information

5

Rev. A1: 07.10.1994

Parameters

Test Conditions / Pin

Symbol

Min

Typ

Max

Unit

AFC output

Pin 7

Output current

deviation

" 50 kHz

"IAFC

60

110

140

mA

Input frequency offset

IAFC = 0

" foff

8

15

kHz

Reference voltage output

Pin 8

Output voltage

I8 = 0.5 mA

V8

3.7

4.2

V

Maximum load current

I8

3

5

mA

Multipath detection

Pin 12, 13, 15

Detector threshold

V12 < 1 V, fV15 = 20 kHz

V15

5.0

7

mV

Output leakage current

V12 = VS

I12

1.5

mA

Charge current

Pin 15 connected to ground

I13

2.1

4.0

mA

Discharge current

Pin 15 open circuit

V13

v 1 V

I13

– 6

– 10

mA

Mute function

Pin 2

Mute “off voltage

Vout – 2 dB

Voff

0.22

0.33

V

IF-Input signal

Pin 8

Limiting threshold

Vout – 3 dB

Vi

25

33

dB

mV

Test circuit:

Vi

Multipath input

Q0

signal

voltage

VAF

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U4270B-CFSG3 Datasheet(PDF) 5 Page - TEMIC Semiconductors

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