High-Speed Current Mirror with Sample/Hold Output

Single-Chip Burst-Mode RSSI Solution Integrates APD Bias, Current Mirror, and Fast Sample/Hold

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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.

DS3923: Typical Application Circuit DS3923: Typical Application Circuit Enlarge+

Key Features

  • Accurate Burst-Mode RSSI Measurement with Two Current Mirror Outputs Improves Dynamic Range
    • -32dBm to -5dBm Optical Input Range
    • ±0.5dB Accuracy
    • Sampling Period as Short as 300ns
    • Pin Discharge Option
  • Low-Noise APD Bias with Shutdown Options Reduces Receiver Sensitivity
    • 15V to 76V APD Bias
    • External Capacitor Connection for Controlled RC Time Constant of APD Voltage Filter
    • Current Clamp with Adjustable Limit and External Shutdown with Limit Status
    • High-Voltage Switch FET for APD Fast Shutdown
  • Small Package Reduces Total Solution Size and Cost
    • 3.5mm x 3.5mm, 24-Pin TQFN Package with Exposed Pad


  • 10GPON OLT
  • APD Monitoring
Part NumberInputsS/H Amps.Output Clamp. DiodesHold Step
maxSee Notes
DS3923 11No10 to 1
$1.51 @1k
See All Sample-and-Hold Circuits (2)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Quality and Environmental Data

Product Reliability Reports: DS3923.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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