High-Speed Current Mirror and Integrated FETs for DC-DC Controller

Single-Chip Burst-Mode RSSI Solution Integrates APD Bias, Current Mirror, and DC-DC FETs



The DS3922 high-speed current mirror integrates high-voltage devices necessary for monitoring the burst mode receive power signal in avalanche photodiode (APD) biasing and OLT applications. The device has two small and one large gain current mirror outputs to monitor the APD current. An adjustable current clamp limits current through the APD. The clamp also features an external shutdown. An integrated FET is also provided that can be used to quickly clamp the high-voltage bias to ground in the case of high optical input power. Integrated low-voltage FET circuits can be used to create buck, boost, and inverting DC-DC converters for efficient laser bias and EML bias applications.

The DS3922 is available in a 24-pin TQFN package and operates over an extended -40°C to +95°C temperature range. 

DS3922: Typical Operating Circuit DS3922: Typical Operating Circuit 放大+


  • 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
  • Supports Additional DC-DC Functions
    • Low-Voltage Synchronous Buck FETs for Efficient DFB Bias
    • Low-Voltage pMOSFET for Generating Negative Bias Voltage for EMLs
  • Small Package Reduces Total Solution Size and Cost
    • 3.5mm x 3.5mm, 24-Pin TQFN Package with Exposed Pad


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请查看具体的参数规格 Fiber Photodiode Current Monitors (8)

Part NumberPhoto Diode Appl.IDIODEIDIODEVBIAS
Package/PinsOper. Temp.
minmaxmaxtypSee Notes
DS3922 APD10µA3.3mA761000
-40 to +95$2.26 @1k

Pricing Notes:
申请可靠性报告: DS3922 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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