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參數(shù)資料
| 型號(hào)： | SP8034A |
| 英文描述： | 250 V/us APC Amplifier with Integrated Photodiode and Gain Adjust Capability |
| 中文描述： | 250伏/我們apc的集成光電二極管放大器和增益調(diào)整能力 |
| 文件頁(yè)數(shù)： | 1/6頁(yè) |
| 文件大?。?/td> | 68K |
| 代理商： | SP8034A |
1
Rev. 5/14/03
SP8034A APC Amplifier with Integrated Photodetector
Copyright 2003 Sipex Corporation
250 V/
μ
s APC Amplifier with Integrated Photodiode
and Gain Adjust Capability
SP8034A
FEATURES
■
Slew Rate of 250V/us
■
7ns Settling Time to 1% for 1.5V Step
■
10 mV Output Offset Voltage
■
20uV/
°
C Output Offset Drift
■
Digital Gain Select
■
+/- 6 dB External Gain Adjust
Figure 1. Functional Diagram
DESCRIPTION
The SP8034A represents the next generation APC amplifier with integrated photodetector. This device
monitors the light intensity of the laser diode in CD-R, CD-RW, DVD-R, DVD-RW and DVD-RAM
assemblies by sensing the laser power with an integrated photodiode. The amplified signal from the
APC contains the laser power information. This signal is subsequently fed back to the laser diode driver
to control its power. The on-chip photodetector transforms incident light into a proportional current. This
current is then converted to a voltage through a transimpedance amplifier. Adjustable gain is provided
in the transimpedance amplifier by means of a gain control loop that is controlled by an external resistor.
The external resistor is not part of the signal path, which greatly reduces the effects of all parasitic
capacitances and inductances on the flex cable at these pins. The signal is buffered to provide reactive
load drive capability.
The SP8034A achieves an unparalleled level of performance by combining excellent DC stability and
low noise with outstanding AC performance. This level of performance is achieved using a proprietary
fully complementary BiCMOS process with fully integrated, on-board photodetectors.
The SP8034A is offered with a nominal gain of 2000V/W and is packaged in a 3.0mm x 3.5mm, 8 lead
COB package.
1
2
3
4
8
7
6
5
V
CC
GAIN SEL
RG
COM
GND
V
OUT
V
REF
R
GAIN2
R
GAIN1
SP8034A
8 Pin COB
V
CC
GND
Rg2
Rg1
TIA
V
REF
R
GAIN1
R
GAIN2
R
GCOM
V
OUT
6k
Gain Control
Buffer
Gain Select
R2
R1
R2
R1
6000
2000
6000
2000
PRELIMINARY
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