深圳市中立信电子科技有限公司

DS3923T+T

电流和电力监控器、调节器 RSSI SAMPLE/HOLD & CURRENT MIRROR

High-Speed Current Mirror  with Sample/Hold Output

DS3923T+T General Description

The DS3923 high-speed current mirror integrates highvoltage 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.

DS3923T+T Benefits and 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

DS3923T+T Applications

● APD Monitoring

● GPON OLT

● 10GPON OLT