ADL5317ACPZ-WP

雪崩光电二极管偏置控制器和宽范围（ 5 nA的到5 mA）的电流监控器 Avalanche Photodiode Bias Controller and Wide Range 5 nA to 5 mA Current Monitor

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