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DS1842N+TR

Description
SPECIALTY ANALOG CIRCUIT, PDSO14
Categoryaccessories   
File Size124KB,7 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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DS1842N+TR Overview

SPECIALTY ANALOG CIRCUIT, PDSO14

19-4557; Rev 1; 3/11
76V, APD, Bias Output Stage with
Current Monitoring
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.
76V Maximum Boost Voltage
Switch FET
Current Monitor with a Wide 1µA to 2mA Range,
Fast 50ns Time Constant, and 10:1 and 5:1 Ratio
2mA Current Clamp with External Shutdown
Multiple External Filtering Options
3mm x 3mm, 14-Pin TDFN Package with Exposed Pad
Features
DS1842
Applications
APD Biasing
GPON Optical Network Unit and Optical Line
Transmission
Ordering Information
PART
DS1842N+
DS1842N+T&R
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
14 TDFN-EP*
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.
Typical Application Circuit
3.3V
LX
DS1842
SW
GATE
GND
FB
COMP
D2
CLAMP
CURRENT
LIMIT
MIROUT
ROSA
DS1875
APD
TIA
MIRIN
C
BULK
CURRENT MIRROR
MIR1
C
COMP
R
COMP
MIR2
EXTERNAL MONITOR
MON3
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

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