Datasheet > DS3920

DS3920

更新时间： 2024-11-22 09:56:39

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描述
Fast Current Mirror Voltage Clamp Protects Subsequent Output Circuitry

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DS3920 数据手册

19-5797; Rev 0; 3/11

DS3920

Fast Current Mirror

General Description

Features

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.

S Wide Voltage Input Range: 2.97V to 76V

S Current Monitor

 Wide 250nA to 2mA Range

 5:1 Mirror Ratio

 Fast 50ns Time Constant

S Current Clamp (2.9mA or 20mA, typ)

S Voltage Clamp Protects Subsequent Output Circuitry

S 6-Pin SOT23 (MAX4007 Compatible)

The device accepts a +2.97V to +76V current mirror

supply voltage. Internal current limiting (2.9mA 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.

Applications

Avalanche Photodiode (APD) Biasing

PIN Photodiode Monitoring

GEPON, GPON, 10GEPON, XGPON: ONU and OLT

The device is available in a 6-pin SOT23 package, and

operates over the -40NC to +85NC extended temperature

range.

Ordering Information appears at end of data sheet.

Typical Application Circuit

APD BIAS

FILTER

3.3V

MIRIN

DIODE

FILTER

0.1μF

CURRENT

MONITOR

MIROUT

THERMAL

SHUTDOWN

I /5

MIR MIROUT

GND

OUT

CURRENT

LIMIT

OUT

DS3920

MIROUT

AGC

499Ω

ROSA

APD

TIA

For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/DS3920.related

�� 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.

12 3 4 5 6 7

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