DS3922T+

DS3922T+ is a high-speed current mirror and integrated FETs for the DC-DC controller. It is a high-speed current mirror that integrates high voltage devices necessary for monitoring the burst mode receive power signal in avalanche photodiode (APD) biasing and OLT applications. This device has two small and one large gain current mirror outputs to monitor the APD current. An adjustable current clamp limits the 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 the 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. It is used in applications such as avalanche photodiode (APD) monitoring, GPON OLT, 10GPON OLT, EML bias, and 10G EPON.

• Accurate burst-mode RSSI measurement with two current mirror outputs improves dynamic range
• Low-noise APD bias with shutdown options reduces receiver sensitivity
• Low-voltage synchronous buck FETs for efficient DFB bias
• Low-voltage pMOSFET for generating negative bias voltage for EMLs
• Current clamp with adjustable limit and external shutdown with limit status
• High-voltage switch FET for APD fast shutdown, low-voltage supply range from 2.85V to 3.63V
• Low-voltage current is 1.5mA typical at (VMIRIN = 15V to 76V, VCC = 2.85V to 3.63V)
• MIRIN quiescent current is 1mA typical at (VMIRIN = 60V, ISRC/SHDN = 30Kohm to GND)
• MIRIN voltage range from 15V to 76V, HV FET turn-on time is 30ns typ at (TA = -40°C to +95°C)
• Operating temperature range from -40°C to +95°C, 24-pin TQFN-EP package

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