U4270B Datasheet, PDF (5/7 Pages) TEMIC Semiconductors – FM IF limiter amplifier and detector

TELEFUNKEN Semiconductors
Parameters
Test Conditions / Pin
Symbol Min
AFC output
Output current
Input frequency offset
" ^{Pin 7}
deviation 50 kHz
I_AFC = 0
"I_AFC
" f_off
60
Reference voltage output
Pin 8
Output voltage
I₈ = 0.5 mA
V₈
3.7
Maximum load current
I₈
Multipath detection
Pin 12, 13, 15
Detector threshold
V₁₂ < 1 V, f_V15 = 20 kHz
V₁₅
5.0
Output leakage current
V₁₂ = V_S
I₁₂
Charge current
Pin 15 connected to ground
I₁₃
2.1
Discharge current
v ^{Pin 15 open circuit}
V₁₃ 1 V
I₁₃
–6
Mute function
Pin 2
Mute “off voltage
IF-Input signal
V_out – 2 dB
V_off
0.22
Pin 8
Limiting threshold
V_out – 3 dB
V_i
25
U 4270 B
Typ
Max
Unit
110
140
mA
8
15
kHz
4.2
V
3
5
mA
7
mV
1.5
mA
4.0
mA
– 10
mA
0.33
V
33
dBmV
Test circuit:
V_i
Multipath input
Q₀
signal
voltage
V_AF
Rev. A1: 07.10.1994
Preliminary Information
5