NJM2777 Datasheet, PDF (3/15 Pages) New Japan Radio – Headphone Amplifier with Electronic Volume

NJM2777
I TEST CIRCUIT
TEST CIRCUIT1 (THD, GEVR, VIM, PO)
Input B
CNT B
Output B
0.47µF
1µF
VCNTB
100Ω
100µF
V+
7
6
5
4
3
2
1
N.C. Mute INb CAPb CNTb OUTb V+
[THD] BPF:400 to 30KHz
10µF ^{[GEVR] BPF:1KHz}
VOL
VOL
Bias
N.C. Vref
8
9
INa CAPa CNTa OUTa GND
10 11 12 13 14
10µF
0.47µF
1µF
Input A
100µF
VCNTA
CNT A
Output A
100Ω
[THD] BPF:400 to 30KHz
[GEVR] BPF:1KHz
Volume
Range
:
GEVR=
20
log
Vo max
Vo min
Vomin : Output voltage at VCNT=0V
Vomax : Output voltage at VCNT=3.3V
–3–