DS3920 Fast Current Mirror

Maxim - Innovation Delivered


Fast Current Mirror

Provides Optimized APD Bias

and Mirror for PON Applications


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 +150°C.
The device is available in a 6-pin SOT23 package, and operates over the -40°C to +85°C extended temperature range.



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