CXA2550M 데이터 시트보기 (PDF) - Sony Semiconductor
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CXA2550M Datasheet PDF : 15 Pages
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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
R6
L1
10µH
130mV
1k
PD
3
R3
C1
100
1µ
R2
500
LD PD
R4
R5
10k
55k
GND
VEE
VEE
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.
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