U4270B Datasheet, PDF (4/7 Pages) TEMIC Semiconductors – FM IF limiter amplifier and detector

U 4270 B
TELEFUNKEN Semiconductors
Parameters
Test Conditions / Pin
Symbol Min
Typ
Max
Unit
AFC output
Output current
Input frequency offset
" ^{Pin 7}
deviation 50 kHz
I_AFC = 0
"I_AFC
" f_off
90
2
Reference voltage output
Pin 8
110
140
mA
12
kHz
Output voltage
I₈ = 0.5 mA
V₈
3.9
4.2
V
Maximum load current
I₈
3
5
mA
Multipath detection
Pin 12, 13, 15
Detector threshold
V₁₂ < 1 V, f_V15 = 20 kHz
V₁₅
5.4
Output leakage current
V₁₂ = V_S
I₁₂
1.5
7
mV
mA
Charge current
Discharge current
Pin 15 connected to ground
I₁₃
3
v ^{Pin 15 open circuit}
V₁₃ 1 V
I₁₃
–7
3.6
mA
– 10
mA
Mute function
Pin 2
Mute “off ” voltage
IF-Input signal
Limiting threshold
V_out – 2 dB
V_out – 3 dB
V_off
0.22
Pin 18
V_i
25
0.33
V
33
dBmV
" V_S = 8.5 V, reference point Pin 1, f_i = 10.7 MHz, adjusted at I₇ = 0, V_i = 10 mV, FM-deviation 75 kHz, f_mod = 1 kHz,
Q₀ = 20, T_amb = – 40 to + 85 _C, unless otherwise specified
Parameters
Test Conditions / Pin
Symbol Min
Typ
Max
Unit
Supply voltage
Supply current
Field strength output
Pin 14
V_S
7.5
Pin 14
I_S
17
Pin 11
15
V
25
mA
Output voltage
V_i = 200 mV
V_i = 50 mV
V_i = 1 mV
V_i = 0 mV
V_OUT
4.0
3.6
2.25
0.01
5.0
V
4.7
2.95
0.42
Audio output signal
Pin 4
Output voltage
Distortion
(S+N)/N ratio
" deviation 75 kHz
V_AF
250
THD
0.48
S+N/N
70
370
mV
0.88
%
81
dB
AM-rejection
Mute depth
m = 30 %
R V₂ = 0 V, R₃ =
V₂ = 0 V, R₃ = 0
60
70
dB
a_mute
6
7
10
dB
34
36
40
Maximum sink current
I₄
0.9
1.1
mA
Stop signal output
Input frequency window
W R_7-8 = 22 k
Pin 6
f_win
" 23
" 39
kHz
Output voltage
HIGH
V₆
7
V
LOW
Input voltage threshold
I₆ < 0.5 mA
V₆ = 0.5 V, Pin 5 open
V₆ = 0.5 V, V₅ = V₈
0.1
0.5
V_i
14
20
54
mV
0.6
2.0
mV
4
Preliminary Information
Rev. A1: 07.10.1994