General Description
The DS1842 integrates the discrete high-voltage com-
ponents necessary for avalanche photodiode (APD)
bias and monitor applications. A switch FET is used in
conjunction with an external DC-DC controller to create
a boost DC-DC converter. A current clamp limits cur-
rent through the APD and also features an external
shutdown. The device also includes a dual current mir-
ror to monitor the APD current.
Applications
APD Biasing
GPON Optical Network Unit and Optical Line
Transmission
Features
f 76V Maximum Boost Voltage
f Switch FET
f Current Monitor with a Wide 1?/SPAN>A to 2mA Range,
Fast 50ns Time Constant, and 10:1 and 5:1 Ratio
f 2mA Current Clamp with External Shutdown
f Multiple External Filtering Options
f 3mm x 3mm, 14-Pin TDFN Package with Exposed Pad
76V, APD, Bias Output Stage with
Current Monitoring
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-4557; Rev 1; 3/11
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxims website at www.maxim-ic.com.
PART
TEMP RANGE
PIN-PACKAGE
DS1842N+
-40癈 to +85癈
14 TDFN-EP*
DS1842N+T&R
-40癈 to +85癈
14 TDFN-EP*
Pin Configuration appears at end of data sheet.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
*EP = Exposed pad.
DS1875
DS1842
SW
FB
D2
COMP
MON3
LX
GATE
GND
MIRIN
MIR1
CLAMP
MIROUT
3.3V
CURRENT MIRROR
CURRENT
LIMIT
MIR2
C
BULK
C
COMP
R
COMP
EXTERNAL MONITOR
TIA
APD
ROSA
Typical Application Circuit
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制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:76V, APD, Bias Output Stage with Current Monitoring
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功能描述:采样&保持放大器 Fast Sample & Hold Circuit RoHS:否 制造商:Texas Instruments 通道数量:2 捕获时间:20 us 电源电压-最大:18 V 最大工作温度:+ 85 C 最小工作温度:- 25 C 安装风格: 封装 / 箱体:SOIC-14 封装:Tube
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