Datasheet > DS3920

DS3920

更新时间： 2024-11-23 14:57:55

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高速电流镜

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DS3920 数据手册

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 (4.4mA 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 (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.

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

100Ω–1000Ω

3.3V

MIRIN

DIODE

FILTER

0.1μF

CURRENT

MONITOR

MIROUT

THERMAL

SHUTDOWN

GND

MIR MIROUT

OUT

CURRENT

LIMIT

OUT

1kΩ–5kΩ

DS3920

MIROUT

AGC

499Ω

ROSA

APD

TIA

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

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

19-5797; Rev 2; 12/11

12 3 4 5 6 7

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