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PDF CXA2549M Data sheet ( Hoja de datos )
| Número de pieza | CXA2549M | |
| Descripción | RF Amplifier for CD Players | |
| Fabricantes | Sony | |
| Logotipo |  |
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RF Amplifier for CD Players
CXA2549M
Description
The CXA2549M is an IC developed for compact
disc players. This IC incorporates an RF amplifier,
focus error amplifier, APC circuit and RF level
control circuit. (The voltage-converted optical
pickup output is supported.)
24 pin SOP (Plastic)
Features
• Low power consumption (45 mW at ±2.5 V)
• High-band RF amplifier
• APC circuit
• RF level control circuit
• Both single power supply and dual power supply
operations possible.
• Compatible with pickup for LC and PD
Applications
Compact disc players
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings (Ta=25 °C)
• Supply voltage
VCC 12 V
• Operating temperature Topr –20 to +75 °C
• Storage temperature Tstg –65 to +150 °C
• Allowable power dissipation
PD 650 mW
Operating Conditions
Supply voltage
VCC—VEE 4.5 to 5.5
V
Block Diagram and Pin Configuration
24 23 22 21 20 19 18 17 16 15 14 13
VCC
VCC
VCC
VREF
1.25V
VC
25.4K
15K 17.4K
VC
87k
25p
VC
VC
164k
158.45k
VEE
omVEE
VC 26k 13k
30k 30k
.c VEE
u VC
VC
t41 2 3 4 5 6 7 8 9 10 11 12
tasheeSony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
aoperation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
www.d —1—
E97428-TE
1 page  
Pin
Symbol
No.
IO
21 AGCCONT I
22 LD ON I
24 VCC —
Equivalent circuit
15µ
147
21
50k
15µ
7µ
VCC
147
22
50µ
VREF
VEE VEE
VEE VEE
CXA2549M
Description
RF level control ON
(limit level of 50 % / 30
%)/ OFF switching pin.
50 % for VCC, 30 % for
open or VC and OFF for
VEE.
ON/OFF selection pin
of APC amplifier.
ON for VCC and OFF for
VEE.
VCC
—5—
5 Page 
CXA2549M
Center Voltage Generation Circuit
This circuit provides the center potential when this IC is used at single power supply. The maximum current
is approximately ±3 mA. The output impedance is approximately 147 Ω. Connect this circuit to GND when
used at dual power supply.
VCC
VCC
30k
30k
VEE
VC BUFFER
147
15k
VC
12
33µ/6.3V
33µ/6.3V
VEE
VC
Notes on Operation
1. Power supply
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.
Dual power supply
Single power supply
VCC
+power supply
Power supply
VEE
–power supply
GND
VC
GND
OPEN
2. Laser Power Control
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.
—11—
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet CXA2549M.PDF ] | |
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