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)
