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Updated at 19/07/2025 10:30:15(UTC+8)
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Description
- Product Details
- The ADL5317 is a high-voltage, wide dynamic range biasing and current monitoring device optimized for use with avalanche photodiodes. With the provision of a stable high-voltage supply up to 80 V, the bias voltage at the*VAPD** pin can be varied from 6 V to 75 V using the 3 V compatible **VSET** pin. The current sourced from the **VAPD** pin, over a range of 5 nA to 5 mA, is accurately mirrored with an attenuation of 5 and sourced from the **IPDM** monitor output. In a typical application, the monitor output drives a current-input logarithmic amplifier to produce an output representing the optical power incident upon the photodiode. The photodiode anode may be connected to a high-speed transimpedance amplifier for the extraction of the data stream.
- A signal applied at the*VSET** pin of 0.2 V to 2.5 V with respect to **COMM** is amplified by a fixed gain of 30 to produce the 6 V to 75 V bias at pin **VAPD**. The accuracy of the ADL5317"s bias control interface allows for straightforward calibration to maintain constant avalanche multiplication factor of the photodiode over temperature. The current monitor output, **IPDM**, maintains its high linearity versus photodiode current over the full range of APD bias voltage. The current ratio of 5:1 remains constant as **VSET** and **VPHV** are varied.
- The ADL5317 is built for exceptional performance and low noise design for all APD modules and systems in next generation optical networks.
- ### Features and Benefits
- Accurately sets avalanche photodiode bias voltage
- Wide bias range from 6 V to 75 V set using 3 V compatible control interface
- Monitors photodiode current (5:1 ratio) over 6 decades
- Linearity 0.5% from 10 nA to 1 mA, 1% from 5 nA to 5 mA
- Over-current protection and over-temperature shutdown
- Allows using a fixed high-voltage switcher, reducing supply decoupling and low-pass filtering requirements, thereby leading to low noise transceiver design
- Miniature 16-lead chip scale package (LFCSP 3mm x 3mm)
ADL5317 Specifications
| Attribute | Attribute Value |
|---|---|
| Datasheet | Datasheet |
| 3D Model | 3D Model |
| Show | |
| Product Lifecycle Status | Active |
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