cxa2549m Sony Electronics, cxa2549m Datasheet - Page 11

• Manufacturer Part Number: cxa2549m
• Description: Rf Amplifier For Cd Players
• Manufacturer: Sony Electronics

Center Voltage Generation Circuit
is approximately ±3 mA. The output impedance is approximately 147 Ω. Connect this circuit to GND when
used at dual power supply.
Notes on Operation
1. Power supply
2. Laser Power Control
This circuit provides the center potential when this IC is used at single power supply. The maximum current
The CXA2549M can be used either at dual power supply or single power supply. The table below shows
the connection of power supply for each case.
The RF level is stabilized by attaching an offset to the APC VL and controlling the laser power in sync with
the RF level fluctuations. Therefore, use this circuit in the state where the focus servo is applied.
The laser life is shortened by increasing the laser power when the less light is reflected from the disc. It is
recommended that the typical laser power value is set lower to maintain the laser life.
Take care of the laser maximum ratings when using the laser power control circuit.
Single power supply
Dual power supply
30k
30k
V
V
CC
EE
+power supply
Power supply
15k
VC BUFFER
V
CC
—11—
147
12
–power supply
VC
V
V
GND
V
CC
EE
EE
33µ/6.3V
33µ/6.3V
VC
OPEN
GND
VC
CXA2549M