Fast Current Mirror

The DS3920 precision current mirror is designed for avalanche photodiode (APD) and PIN photodiode biasing and monitoring applications. The device offers a current clamp to limit current through the APD and a current mirror 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 +150°C.

The device is available in a 6-pin SOT23 package, and operates over the -40°C to +85°C extended temperature range.

Applications

* Avalanche Photodiode (APD) Biasing * GEPON, GPON, 10GEPON, XGPON: ONU and OLT * PIN Photodiode Monitoring

* Wide Voltage Input Range: 2.97V to 76V

* Current Monitor

* Wide 250nA to 2mA Range

* 5:1 Mirror Ratio

* Fast 50ns Time Constant

* Current Clamp (4.4mA or 20mA, typ)

* Voltage Clamp Protects Subsequent Output Circuitry

* 6-Pin SOT23 (MAX4007 Compatible)