DS3920

Manufacturer Part NumberDS3920
DescriptionThe DS3920 precision current mirror is designed for avalanche photodiode (APD) and PIN photodiode biasing and monitoring applications
ManufacturerMaxim
DS3920 datasheet
 
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General Description
The DS3920 precision current mirror is designed for ava-
lanche photodiode (APD) and PIN photodiode biasing
and monitoring applications. The device offers a current
clamp to limit current through the APD and a current mir-
ror output that produces a signal proportional (5:1) to the
APD current. A diode is also provided to limit the voltage
at the current mirror output.
The device accepts a +2.97V to +76V current mirror
supply voltage. Internal current limiting (4.4mA or 20mA,
typ) protects the monitored device from a short circuit to
ground. The provided internal clamp diode protects the
current mirror output from overvoltage. Additionally, the
device features thermal shutdown if the die temperature
reaches +150NC.
The device is available in a 6-pin SOT23 package, and
operates over the -40NC to +85NC extended temperature
range.
3.3V
DIODE
CURRENT
MONITOR
GND
For related parts and recommended products to use with this part, refer to:
 � ���������������������������������������������������������������� Maxim Integrated Products  1
Forpricing,delivery,andorderinginformation,pleasecontactMaximDirectat1-888-629-4642,
orvisitMaxim’swebsiteatwww.maxim-ic.com.
Fast Current Mirror
S WideVoltageInputRange:2.97Vto76V
S CurrentMonitor
 Wide250nAto2mARange
 5:1MirrorRatio
 Fast50nsTimeConstant
S CurrentClamp(4.4mAor20mA,typ)
S VoltageClampProtectsSubsequentOutputCircuitry
S 6-PinSOT23(MAX4007Compatible)
Avalanche Photodiode (APD) Biasing
PIN Photodiode Monitoring
GEPON, GPON, 10GEPON, XGPON: ONU and OLT
Ordering Information
Typical Application Circuit
MIRIN
I
I
/5
MIROUT
MIROUT
THERMAL
SHUTDOWN
MIR I
/5
MIROUT
CURRENT
LIMIT
DS3920
MIROUT
R
AGC
499Ω
ROSA
APD
TIA
www.maxim-ic.com/DS3920.related
19-5797; Rev 2; 12/11
DS3920
Features
Applications
appears at end of data sheet.
APD BIAS
R
FILTER
100Ω–1000Ω
C
FILTER
0.1 F
V
OUT
R
OUT
1kΩ–5kΩ

DS3920 Summary of contents

  • Page 1

    ... General Description The DS3920 precision current mirror is designed for ava- lanche photodiode (APD) and PIN photodiode biasing and monitoring applications. The device offers a current clamp to limit current through the APD and a current mir- ror output that produces a signal proportional (5:1) to the APD current. A diode is also provided to limit the voltage at the current mirror output ...

  • Page 2

    ... SYMBOL CONDITIONS V MIRIN 2.5mA MIRIN MIROUT 100FA +25NC 5mA +25NC DF A DS3920T-001 version MIROUT DS3920T-002 version (Note 1) AGC 1FA to 2.5mA K MIR I > 2.5mA MIROUT (Note 2) ( MIRIN MIR MIR / 30V or 60V (Notes 2, 3) ...

  • Page 3

    ... V = 40V MIRIN 10 1 0.1 0.01 0.001 0.01 0 (mA) MIROUT GAIN ERROR vs. MIROUT CURRENT 40V MIRIN 0.001 0.01 0 (mA) MIROUT GAIN ERROR vs. MIRIN VOLTAGE 2.0 1.5 1.0 0 1µA MIROUT I = 2.5mA 0 MIROUT I = 5mA -0.5 MIROUT -1 10mA -1.5 MIROUT -2 (V) MIRIN DS3920 ...

  • Page 4

    ... CH1: 20V/div CH2: 20V/div STARTUP DELAY ( 2.5mA) MIRIN MIROUT DS3920 toc11 5V CH1 MIRIN D.U.T MIR MIROUT CH2 R2 R1 5kΩ 1.7kΩ 200µs/div CH1: 2V/div CH2: 2V/div DS3920 = 2.5mA) MIROUT DS3920 toc09 40V CH1 MIRIN D.U.T MIR MIROUT CH2 R2 R1 5kΩ 15.6kΩ ...

  • Page 5

    ... A: MIROUT SHORTS TO GND THROUGH 10Ω B: CURRENT LIMIT ACTIVE C: THERMAL SHUTDOWN D: POST COOL-DOWN REENTRY E: THERMAL SHUTDOWN F: POST COOL-DOWN REENTRY PIN 1 6 MIRIN N. MIROUT 5 6 Fast Current Mirror VOLTAGE DROP vs. MIROUT CURRENT DS3920 toc13 1 2.97V MIRIN 1 -40° +25°C A 0.6 0.4 0 +85°C ...

  • Page 6

    ... Detailed Description The DS3920 provides a fast, precision current mirror for photodiode-monitoring applications. The current mirror is accurate across a large dynamic range. The mirror response time is fast enough to comply with GPON Rx burst-mode monitoring requirements. The device has a built-in current limiting feature to protect photodiodes from large signal inputs, and an included thermal shut- down ...

  • Page 7

    ... Maxim Integrated Products © DESCRIPTION MIROUT = +25°C test conditions and R resistor values to the Typical Application Circuit OUT Maxim is a registered trademark of Maxim Integrated Products, Inc. DS3920 Fast Current Mirror Revision History PAGES CHANGED values for -002 version from — 1 ...