DS3920 Maxim, DS3920 Datasheet

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DS3920

Manufacturer Part Number
DS3920
Description
The DS3920 precision current mirror is designed for avalanche photodiode (APD) and PIN photodiode biasing and monitoring applications
Manufacturer
Maxim
Datasheet
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.
For related parts and recommended products to use with this part, refer to:
Forpricing,delivery,andorderinginformation,pleasecontactMaximDirectat1-888-629-4642,
orvisitMaxim’swebsiteatwww.maxim-ic.com.
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3.3V
General Description
DIODE
GND
CURRENT
MONITOR
MIROUT
I
MIROUT
SHUTDOWN
APD
THERMAL
CURRENT
LIMIT
R
499Ω
AGC
TIA
ROSA
I
MIROUT
DS3920
www.maxim-ic.com/DS3920.related
S WideVoltageInputRange:2.97Vto76V
S CurrentMonitor
S CurrentClamp(4.4mAor20mA,typ)
S VoltageClampProtectsSubsequentOutputCircuitry
S 6-PinSOT23(MAX4007Compatible)
Ordering Information
/5
 Wide250nAto2mARange
 5:1MirrorRatio
 Fast50nsTimeConstant
Avalanche Photodiode (APD) Biasing
PIN Photodiode Monitoring
GEPON, GPON, 10GEPON, XGPON: ONU and OLT
MIRIN
MIR I
Fast Current Mirror
MIROUT
Typical Application Circuit
/5
appears at end of data sheet.
APD BIAS
R
100Ω–1000Ω
R
1kΩ–5kΩ
C
0.1 F
FILTER
OUT
FILTER
V
OUT
Applications
DS3920
19-5797; Rev 2; 12/11
Features

Related parts for DS3920

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 ...

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