s Application Circuit
100kΩ
2.2kΩ
33µF
100kΩ
2200pF
36kΩ
0.01µF
390kΩ
9
–
R1 10kΩ
OPO. AP.mApm. p.
+
2
5
VEXT
1kΩ
R2 10kΩ
VCC=5—20V
100µF
33pF
10kΩ
RIAA Preamplifier (single power supply operation)
Note) R1 and R2 are resistances for setting operational amplifier bias.
Set R1 and R2 so that VEXT=2.0V to 6.0V.
(Recommended Voltage VEXT=4.5V)
s How to Apply External to the AN6550
1. The AN6550 is an operational amplifier with a phase
compensation circuit built-in, allowing low voltage oper-
ation, and its current consumption and bandwidth can be
changed by applying external bias to it.
2. As shown below, applys bias voltage to 2 VEXT pin of the
AN6550 allows the AN6550 to be handled in the very
same way as the AN6551, except for pin connection.
Set VEXT >=VEE+1V.
2 ) By connecting VEXT pin to GND
VCC
9
AN6550
2
5
VEXT
VEE
4 ) By Zener diode
(VCC–VEE >= 6V)
VCC
9
AN6550
2 VEXT
5
VEE
R >=10kΩ
1 ) By diode
VCC
9
AN6550
2
5
VEE
VEXT
R=1kΩ
—10kΩ
3 ) By dividing with resistors
VCC
9
AN6550
2 VEXT
5
VEE
R1=10kΩ
VR=10kΩ