Product category:
Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: ADL5315
Edited by the Electronicstalk Editorial
Team on 12 August 2005
High-side monitor eases optical
interfacing
A new high-side monitor provides a compact solution for the commonproblem of interfacing an optical power monitoring device, such as a logarithmic amplifier, to the cathode-side of a PIN photodiode.
Analog Devices is introducing a high-side monitor that provides a compact solution for the common and often challenging problem of interfacing an optical power monitoring device, such as a logarithmic amplifier, to the cathode-side of a PIN photodiode The ADL5315 mirrors the current at the cathode at a 1:1 ratio over a six-decade range, producing an output equal to the reference current monitored
This article was originally published on Electronicstalk on 2 Jul 2008 at 8.00am (UK)
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Competing optical current monitors have much higher mirror ratios over narrower ranges, rendering proportional outputs at very low input currents impossible, whereas discrete solutions are more complex to implement and may require significantly more board space.
The ADL5315 offers unmatched accuracy, with linearity of only 1% over a wide operating range of six decades - from 3nA to 3mA.
In PIN photodiode modules where only the cathode is available for connection, the high linearity allows the device to be paired with linear or logarithmic amplifiers to form a complete, precise optical power measurement system.
Although the ADL5315 is optimised for use with PIN photodiodes, its operating range makes it suitable for a broad array of applications that require accurate current mirroring.
The ADL5315 features an adjustable input current limit to protect the photodiode from damage caused by excessive input current.
Its miniature single-chip 2 x 3mm package makes it well-suited for space-constrained applications, such as SFP (small form factor pluggable) optical transceiver modules.
The ADL5315 is fully specified from -40 to +85C, and operates from a single 2.7 to 8V supply.
The ADL5315 is sampling now, with volume production scheduled for October 2005.
The device is priced at $1.93 per unit in 1000-piece quantities and is packaged in a 2 x 3mm, 8-lead LFCSP.
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