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ADI offers new way to link photodiode and power monitor

Posted: 19 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:analog devices? adi? high-side monitor? pin photodiode? adl5315?

Analog Devices Inc. (ADI) 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.

The company reports that the ADL5315 offers unmatched accuracy, with linearity of only 1 percent 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. While the ADL5315 is optimized 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-by-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 -40C to 85C, and operates from a single 2.7Vdc to 8 Vdc supply.

Packaged in a 2-by-3mm, 8-lead LFCSP, the ADL5315 is priced at $1.93 each in 1,000-piece quantities. This device is already available.

- Janine Love


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