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DS1842N+TR Datasheet

Download or read online Maxim Integrated DS1842N+TR 76V, APD, Bias Output Stage with Current Monitoring pdf datasheet.



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19-4557; Rev 0; 4/09
76V, APD, Bias Output Stage with
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.
APD Biasing
GPON Optical Network Unit and Optical Line
Transmission
Pin Configuration appears at end of data sheet.
3.3V
SW
FB
C
COMP
R
COMP
COMP
D2
DS1875
MON3
________________________________________________________________ Maxim Integrated Products
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.
Current Monitoring
♦ 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
Applications
PART
DS1842N+
DS1842N+T&R
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
* EP = Exposed pad.
LX
DS1842
GATE
GND
CURRENT MIRROR
CLAMP
CURRENT
LIMIT
MIROUT
APD
TIA
Features
Ordering Information
TEMP RANGE
PIN-PACKAGE
-40°C to +85°C
14 TDFN-EP*
-40°C to +85°C
14 TDFN-EP*
Typical Application Circuit
C
BULK
MIRIN
MIR1
MIR2
EXTERNAL MONITOR
ROSA
1

Summary of Contents

Page 1

... R COMP COMP D2 DS1875 MON3 ___ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. Current Monitoring 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 ♦ ...

Page 2

APD, Bias Output Stage with Current Monitoring ABSOLUTE MAXIMUM RATINGS Voltage Range on GATE and CLAMP Relative to GND...-0.3V to 12V Voltage Range on MIRIN, MIROUT, MIR1, and MIR2 Relative to GND...-0.3V to 80V Stresses beyond those listed under ...

Page 3

A MIRIN vs. MIROUT CURRENT (V 40V) MIRIN 10,000 1000 100 100 1000 10,000 MIROUT CURRENT (μA) MIR ERROR vs. TEMPERATURE (I 1μA) MIROUT 2 1 MIR2 0 -1 ...

Page 4

APD, Bias Output Stage with Current Monitoring (T 25°C, unless otherwise noted.) A FET ON-RESISTANCE vs. DRAIN CURRENT 2. 3. ...

Page 5

MIR1 REF Figure 1. Current Clamp from Current Feedback Detailed Description The DS1842 contains discrete high-voltage compo- nents required to create an APD bias voltage and to monitor the APD bias current. The devices mirror out- puts are a current ...

Page 6

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 6 ___Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2009 Maxim Integrated Products For the latest package outline information and land patterns www ...

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