LC502 データシートの表示（PDF） - Gennum -> Semtech
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LC502 Datasheet PDF : 5 Pages
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1k
1k
+
22
+
IN
VCC
LD502
VR
Gain
Set
OUT
C1
0.47
AGC AGC
GND Filter IN
+ C5
22
+ C4
R1
22
C2 +
+
2.2
C3
1.0
All resistors in ohms, all capacitors in farads unless otherwise stated
Fig. 4 Input Connection for Two
Wire Electret Microphone
+ C5
22
VCC VR
R1
Gain
+
IN
Set
LD502 OUT
C1
1.0
AGC AGC
GND Filter IN
C2 +
+
2.2
C3
1.0
+ C4
22
All resistors in ohms, all capacitors in farads unless otherwise stated
Fig. 5 Input Connection for Three
Wire Electret Microphone
2. Circuit No. 2 Extended Frequency Response Recording Amplifier
CIRCUIT DESCRIPTION
A slightly different version of the recording amplifier with
high frequency and low frequency emphasis is shown in
Figure 6. This gives a better response at the low end as
well as at the high end of the spectrum.
2.2k
A
VCC VR
R1
130k
+ C4 R6
22 470
Gain
+
IN
LD502
Set
OUT
+
C1
1.0
AGC AGC
GND Filter IN
C6
R2
1.0
5.6K
+
C2 +
2.2
C3
1.0
C15 R11
2.2nF 4.7k
The frequency response of this version measured under
the same conditions (RS=2.2K, VIN-50µV) is shown in
Figure 7. Proper values must be selected for R3, R5, R11,
C11 and C15 depending on the particular application in
order to optimize the recording/playback characteristic.
+ C5
22
5-6V
Bias
RC
1
B
OUT 2
4
IN
LC507
RF
100k
3
C8
2.2
+
C7
2.2nF
R4
27k
C9
2.2nF
RD
47k
All resistors in ohms, all capacitors in µF unless otherwise stated
R5
180k
R3
100k
C11
2.2nF
Fig. 6 Circuit No. 2 Recording Amplifier with High and Low Frequency Pre-Emphasis
15
10
5
0
-5
-10
-15
-20
0.1
1
FREQUENCY (kHz)
10
20
Fig. 7 Recording Amplifier with Equalization
3
500 - 64 - 4
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