– 9 –

CXA1821M

Center Voltage Generation Circuit

This circuit provides the center potential when this IC is used at single power supply. The maximum current is

approximately ±3mA. The output impedance is approximately 147

Ω. Connect this circuit to GND when used at

dual power supply.

Notes on Operation

Power supply

The CXA1821M can be used either at dual power supply or single power supply. The table below shows the

connection of power supply for each case.

VC BUFFER

30k

147

VC

33µ/6.3V

15k

30k

33µ/6.3V

VC

12

Dual power supply

Single power supply

+power supply

Power supply

–power supply

GND

VC

GND

OPEN