U4311B-FS Datasheet, PDF (11/13 Pages) ATMEL Corporation – Low-Current Superhet Remote Control Receiver

U4311B-FS
C₂
100 nF
R₁
8.2 kW
R₁₅
22 kW
V_S
C₇
10 mF
R₁₄
22 kW
C₈
100 nF
C₉
10 mF
20 19 18 17
Filter ^{TOKO A119ACS-19000Z}
(L = 2.2 mH, C = 100 pF)
C₁₀
22 pF
16 15
R₉
56 W
R₁₀
300 W
R₈
100 kW
IF input
C₁₁
10 nF
Wake-up
out
14 13 12
11
R₁₁
10 kW
C₁
10 nF
R₂
30 kW
C₃
1.5 nF
R₆
100 kW
R₅
100 kW
1
2
3
4
5
6
7
8
C₄
100 nF
R₁₂
C₁₂
Wake up
100 kW 220 nF
Data filter
output
22Rk⁷W
R₃
220 kW
C₅
220 nF
R₁₃
10 kW
R₄
100 kW
Figure 26. FM test circuit with 2-kHz Bessel lowpass data filter
9 10
Comparator
output
C₆
220 nF
10
0
–10
–20
–30
–40
–50
–60
–70
0
95 10291
S+N
N
20
40
60
80 100
IF-input level ( dmBV )
Figure 27. Signal-to-noise ratio FM; deviation 22.5 kHz
2.5
C₁₀ = 22 pF
2.0
1.5
1.0
C₁₀ = 47 pF
0.5
0.0
10.3
10.5
10.7
10.9
11.1
95 10290
Frequency ( MHz )
Figure 28. FM-discriminator characteristic
Rev. A3, 28-Sep-00
11 (13)