The DS3923 high-speed current mirror integrates high-voltage devices necessary for monitoring the burst-mode receive power signal in avalanche photodiode (APD) biasing and optical line terminal (OLT) applications. It provides small and large gain current mirror outputs to monitor the APD current. A sample/hold circuit with automatic gain selection captures the sampled signal so that an external ADC can accurately measure the signal. An adjustable current clamp limits current through the APD. The clamp also features an external shutdown. An integrated FET is also provided which can be used to quickly clamp the high-voltage bias to ground in the case of high optical input power.The DS3923 is available in a 24-pin TQFN package and operates over an extended temperature range of -40°C to +95°C.Applications10GPON OLTAPD MonitoringGPON OLT