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DS3920 - Fast Current Mirror

General Description

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.

Key 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. 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) Features S Wide Voltage Input Range: 2.97V to 76V.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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19-5797; Rev 0; 3/11 DS3920 Fast Current Mirror General Description 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 (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.