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PDF A2550N Data sheet ( Hoja de datos )
| Número de pieza | A2550N | |
| Descripción | CAA2550N | |
| Fabricantes | Sony | |
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Hay una vista previa y un enlace de descarga de A2550N (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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RF Amplifier for CD Players
CXA2550M/N
Description
The CXA2550M/N is an IC developed for compact
disc players. This IC incorporates an RF amplifier,
focus error amplifier, tracking error amplifier, APC
circuit and RF level control circuit. (The voltage-
converted optical pickup output is supported.)
CXA2550M
20 pin SOP (Plastic)
CXA2550N
20 pin SSOP (Plastic)
Features
• Low power consumption (35mW at 3.5V)
• APC circuit
• RF level control circuit
• Both single power supply and dual power supply
operations possible.
Structure
Bipolar silicon monolithic IC
Applications
Compact disc players
Block Diagram and Pin Configuration (Top View)
Absolute Maximum Ratings (Ta = 25°C)
• Supply voltage VCC 12
• Operating temperature Topr –20 to +75
• Storage temperature Tstg –65 to +150
• Allowable power dissipation
PD (SOP) 620
(SSOP) 370
V
°C
°C
mW
mW
Operating Conditions
Supply voltage
VCC – VEE 3.0 to 4.0
V
www.DataSheet4U.com
Sony 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
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
–1–
E97514B25
1 page  
Pin
No.
Symbol
I/O
Equivalent circuit
CXA2550M/N
Description
16 RF I
I
147
16
15k
The RF amplifier output RFO is input
with its capacitance coupled.
20µ
17 RFTC
147
— 17
50µ
50µ
10µ
External time-constant pin for RF
level control.
147
18 AGCCONT I
18
50k
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15µ 15µ
RF level control ON (limit level of
50%/30%)/OFF switching pin.
OFF for Vcc, 30% for open or Vc
7µ and 50% for VEE.
19 LD_ON
I
147
19
50µ
APC amplifier ON/OFF switching
pin.
VREF OFF for Vcc and ON for VEE.
20 VCC
20 VCC Vcc pin.
–5–
5 Page 
CXA2550M/N
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 50Ω.
VCC
30k
30k
50 VR
10
VEE
APC & Laser Power Control
VCC
R1 C2
22 100µ
LD
2
L1
10µH
130mV
PD
3
R3
C1 100
1µ R2
500
LD PD
R4
10k
R6
1k
R5
55k
GND
VEE
VEE
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VCC
R10
56k
19 LD_ON
R8
10k
R11 R12
10k 56k
VL
VREF
VEE
R14
12.5k
MICRO-
COMPUTER
C3
0.01µ
RF I 1.1Vp-p
16
RF O
15
R7
6k
R9
54k
RF
VEE
AGCCONT MICRO-
18 COMPUTER
50µ
670mV
R15
13.4k
17
RFTC
R13 C4
1M 1µ
1
AGCVTH
• APC
VEE VEE
When the laser diode is driven by a constant current, the optical power output has extremely large negative
temperature characteristics. The APC circuit is used to maintain the optical power output at a constant level.
The laser diode current is controlled according to the monitor photo diode output.
APC is set to ON by connecting the LD_ON pin to VCC; OFF by connecting it to VCC.
– 11 –
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet A2550N.PDF ] | |
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