LC550 データシートの表示（PDF） - Gennum -> Semtech
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LC550 Datasheet PDF : 6 Pages
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33K
Ι MIC
+
10
820
S1 V11 3.3k
+
4.7
0.022
8
22k
220
V1
1kHz
MIC SUPPLY
6
9
2.2k
23dB 40dB
5
0.047
1
4.7
S4
ITOT
RB
BATTERY
SIMULATOR
VB
+
1.3 V DC
VO
1k
73
2 10 4
10k
0.047
0.01
C2
2.2
RG*
C3
2.2
S2
S3
MICROPHONE SIMULATOR
NOTES:
1. 42.13 dB of attenuation from V1 to V11
2 *RG (equivalent gnd resistance) should not exceed 30 mΩ (increasing RG increases distortion)
All resistors in ohms, all capacitors in µF unless otherwise stated.
Fig. 1 Test Circuit
6
0.022
8
23dB
+ 4.7NOTE1+
2.2
7
10k
2
0.047
3
4
0.01
+
2.2
9
5
40dB
1
10
VB
1.3 V DC
0.047
2k TYP
NOTE: 1. 2.2 µF when receiver is > 3kΩ
All resistors in ohms, all capacitors in µF unless otherwise stated.
Fig. 2 Typical Hearing Aid Application
3
2
9
2.2k
1
6
27k
33k
8
5
10
7
4
All resistors in ohms, all capacitors in µF unless otherwise stated.
U.S. Patent No. 4,085,382, patented in other countries.
Fig. 3 Functional Schematic
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27425 - 2
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