U4240B Datasheet, PDF (5/8 Pages) TEMIC Semiconductors – AM - RECEIVER

TELEFUNKEN Semiconductors
U4240B
Operating Conditions
V_S = 8.5 V, f_iRF = 1 MHz, f_mod = 0.4 kHz, m = 30%, T_amb = 25°C, reference point Pin 18 (fig. 2) unless otherwise specified
Parameters
Test Conditions / Pins Symbol Min.
Typ.
Max.
Unit
RF input voltage
(S+N)/N = 6 dB = 26 dB
1.5
= 46 dB
V_iRF
15
mV
150
RF input for AGC operation
V_iRF
30
mV
Control range with ref. to
V_iRF = 500 mV
DV_oAF = 6 dB
DV_iRF
87
dB
Maximum RF input voltage d = 3%, m = 80%
0.5
d = 3%, m = 30%
V_iRF
0.7
V
d = 10%, m = 30%
0.9
Audio output voltage
RF input voltage
V_i
V_i
=
=
1
4
mV
mV,
m
=
0.8
Pin 6
V_oAF
310
75
mV
V_oAF = 60 mV
V_iRF
2
5.5
9
mV
Total distortion of audio
m = 80%, V_i = 1 mV
d
0.7
%
output voltage
m = 30%, V_i = 500 mV
0.9
%
Signal plus noise to noise
ratio of audio output voltage V_i = 100 mV
(S+N)/N
56
dB
IF bandwidth ( – 3 dB)
IF selectivity
" Df = 9 kHz
" Df = 36 kHz
B_IF
S_IF
4.6
30
60
kHz
dB
Test Circuit
50 W
R_G ^viRF
VS1
Band
switch diodes
47mF ^{12...440 pF} 2...22 pF
33 pF
22W
507 pF
fosc
RL12 _{2.2 kW}
10 nF
voIF
22 nF
1 mA
+
VS2
0.1 mF
22 W ^{L 1 95mH 0.1mF}
RL11 _{2.7 kW}
18
17
16
15
14
13
12
11
10
U4240B
1
2
34
5
6
7
8
9
10 nF
3.3 nF
AM _{3.9 nF}
L2
2.2 kW
L3
IF Filter
56 pF
SFZ
460 A
0.22mF
12 kW ^C7
C8
2.2mF _22mF
0.1mF
3.3 nF
93 7617 e
VS2
voAF
voAF
Figure 2.
Rev. A1: 12.07.1995
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