ADL5317 is a cascade avalanche photodiode (APD) bias controller and wide range (5 nA to 5 mA) current monitor. It accurately sets APD bias voltage with a wide bias range and a 3 V-compatible control interface. The product also monitors photodiode current and features overcurrent protection and overtemperature shutdown.
The ADL5317 provides precise bias voltage control for avalanche photodiodes (APD) with a wide bias range from 6 V to 75 V and a 3 V‑compatible control interface. It monitors photodiode current over six decades (5 nA to 5 mA) with a fixed 5:1 attenuation ratio, and includes over‑current and thermal shutdown features.
The device is supplied in a 16‑lead LFCSP package and operates from –40 °C to +85 °C. Detailed specifications cover bias voltage range, current gain, supply requirements, pin functions, performance characteristics, noise behavior, response time, and protection mechanisms. Evaluation board configurations and ordering information are also provided.
| Bias Voltage Range | 6 V to 75 V |
|---|---|
| Input Current Range (IAPD) | 5 nA to 5 mA |
| Low Voltage Supply (VPLV) | 4 V to 6 V |
The device can set a bias voltage from 6 V up to 75 V.
When the die temperature exceeds about 140 °C, the device shuts down and the FALT pin asserts a low‑level fault signal until the temperature falls below the trigger point.