Product category:
Power Supply ICs and Controllers
News Release from: Analog Devices | Subject: ADL5317
Edited by the Electronicstalk Editorial
Team on 28 February 2005
Controller keeps watch over avalanche
photodiodes
Analog Devices is introducing the first device to combine avalanche photodiode (APD) bias control and current monitoring on a single chip for space-constrained optical transceiver modules.
Analog Devices is introducing the first device to combine avalanche photodiode (APD) bias control and current monitoring on a single chip for space-constrained optical transceiver modules For optical network designers who need to ensure the responsivity of a temperature-sensitive APD, the ADL5317 accurately sets the bias voltage over a 6 to 72V range, while simultaneously monitoring current over a six-decade range
This article was originally published on Electronicstalk on 2 Jul 2008 at 8.00am (UK)
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The device supports next-generation optical networks operating at typical datarates of 10Gbit/s and above, and its linear interface reduces the noise normally found in APD modules.
As datarates grow to 10Gbit/s and beyond, systems are increasingly transitioning from PIN diodes to higher performing APDs, which improve receiver sensitivity and increase link reach.
For an APD to work accurately in receiver designs, continuous voltage correction and bias control are required.
The 3V linear bias control interface of the ADL5317 allows optical designers to use a fixed high-voltage switcher, lowering the supply decoupling and low-pass filtering requirements of traditional APD biasing designs that are prone to switching noise created by PWM-based DC/DC convertors.
It mirrors photodiode current (5:1 ratio) over six decades with a linearity of 0.5% from 50nA to 1mA and 1% from 5nA to 5mA, enabling high-side current measurement when used with optical power measurement devices, such as ADI's AD8304, AD8305, ADL5306 and ADL5310 translinear log amps.
The ADL5317 is built for exceptional performance and ease of design for all APD modules and systems.
Features such as overcurrent protection and overtemperature shutdown protect the expensive APD from damage caused by excessive input current and die temperature, shutting down the bias controller until temperature falls below 120C and current levels fall below acceptable levels.
The ADL5317 APD bias controller is sampling now in a space-saving 3 x 3mm LFCSP (lead frame chip-scale package) and is priced at $4.10 per unit in 1000-piece quantities.
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