U4270B Datasheet, PDF (2/7 Pages) TEMIC Semiconductors – FM IF limiter amplifier and detector

U 4270 B
Pin description
DIP SSO Symbol
18 20
Function
1
1
GND Ground
2
2 MUTE IN Mute input
–
3
NC N.C.
3
4 MUTE DE Mute depth
4
5
AF AF output
5
6 STOP SEN Search tuning stop sensi-
tivity
6
7 STOP SIG Search stop signal output
7
8
AFC AFC output
8
9 RVOLT Reference voltage output
9
10 DEMOD Demodulator circuit
10 11 DEMOD Demodulator circuit
TELEFUNKEN Semiconductors
DIP SSO Symbol
18 20
Function
11 12
FS Field strength
12 13 MPOUT Multipath identification
output
13 14
RTC Rectifier time constant
14 15
15 16
V_S
MPIN
Supply voltage
Multipath identification
input
–
17
NC N.C.
16 18
BFB Bias feedback
17 19
BFB Bias feedback
18 20
IF IF input
GND ¹
MUTE IN ²
MUTE DE 3
AF 4
STOP SEN 5
STOP SIG ⁶
AFC ⁷
RVOLT 8
DEMOD 9
2
18 IF
17 BFB
16 BFB
15 MPIN
14 V_S
13 RTC
12 ^MPOUT
11 FS
10 DEMOD
94 8949
GND ¹
MUTE IN ²
NC ³
MUTE DE ⁴
AF 5
STOP SEN ⁶
STOP SIG ⁷
AFC ⁸
RVOLT ⁹
DEMOD 10
20 _IF
19 BFB
18 _BFB
17 NC
16 _MPIN
15 _VS
14 _RTC
13 MPOUT
12 _FS
11 _DEMOD
94 8948
Preliminary Information
Rev. A1: 07.10.1994