s APPLICATION CURCUIT
Rf 20kΩ
V+=+3V
10µF
6
Ci Ri
INPUT
4
0.1µF 20kΩ
3
C1
1.0µF
C2
2
4.7µF
50kΩ
145kΩ
50kΩ
BIAS
1
#A
5
#B
8
TSD
7
NJM2770
CD(POWER DOWN)
SPEAKER
8Ω/16Ω
note:1.The CD terminal(1pin) should connect High level(>2.0V), when NJM2770 is active.
The standby mode, when the CD terminal is Low level(<0.8V).
2.To add the C1 and C2 capacitor, the power-supply-rejection-ratio will be improved.
When C1 is large vaiue, C2 will be unnecessary.
3.The power-up time depend on the C1 and C2 capacitor.
4.The input current of CD terminal is as shown below figure.
V+
72kΩ
1pin
80kΩ
GND
5.No connect oscillation-protect RC required.
To connect oscillation-protect RC, if the NJM2770 oscillate with PC board/stray capacitor/long speaker wire
and others condition.
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