U4311B Datasheet, PDF (11/14 Pages) TEMIC Semiconductors – Low-current Superhet Remote Control Receiver

TELEFUNKEN Semiconductors
U4311B
R₁₅
22 k W
V_S
R₁₄
22 k W
C₇
10 mF
C₈
Filter
m ^{TOKO A119ACS-19000Z}
(L = 2.2 H, C = 100 pF)
56 W R9
100 nF
C₉
10 mF
C₁₀
22 pF
300 W
R₈
100 k W
IF input
R₁₀
C₁₁
10 nF
C₂
100 nF
C₁
10 nF
W 8.2 k
R₁
16
15
14
13
12
11
10
9
Wake up
out
C₃
1.5 nF
100 kW
1
2
3
30 k W R2
R₆
W 100 k
R₅
C₄
100 nF
Data filter
output
R₇ Wake up
22 kW
R₃
220 kW
C₅
220 nF
4
5
6
7
8
R₁₂
C₁₂
R₁₁
10 k W
W 100 k 220 nF
100 kW
R13
R₄
10 k W
C₆
220 nF
Comparator
output
Figure 26. FM test circuit with 2 kHz Bessel low pass data filter
10
0
–10
–20
–30
–40
–50
–60
–70
0
95 10291
S+N
N
20
40
60
80 100
m IF-input level ( d BV )
Figure 27. Signal to noise ratio FM; deviation 22.5 kHz
Rev. A1: 23.06.1995
2.5
C₁₀ = 22 pF
2.0
1.5
1.0
C₁₀ = 47 pF
0.5
0
10.3
10.5
10.7
10.9
11.1
95 10290
Frequency ( MHz )
Figure 28. FM-discriminator characteristic
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