Product category:
Power Supply ICs and Controllers
News Release from: Analog Devices | Subject: ADN2847 and ADN2848
Edited by the Electronicstalk Editorial
Team on 24 December 2001
Laser diode drivers ramp comms up to
3.3Gbit/s
Analog Devices has expanded its range of optical networking laser diode drivers, extending dual-loop capability to 3.3V applications.
Analog Devices has expanded its range of optical networking laser diode drivers, extending dual-loop capability to 3.3V applications These "anyrate" LDDs support data rates from 50Mbit/s to 3.3Gbit/s
This article was originally published on Electronicstalk on 14 Sep 2001 at 8.00am (UK)
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With ADI's dual-loop capability, manufacturers can use less expensive optics because the LDD compensates for variations that occur in laser diodes over time and temperature changes.
Operating at reduced supply voltages, the new ADN2847 and ADN2848 offer laser module designers a low cost solution for delivering consistent optical performance over a wide range of temperatures and operating conditions.
Applications include SONET OC-3/12/48, SDH STM-1/4/16, Fibre Channel and Gigabit Ethernet modules.
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"Closed loop control of laser diode average-power and extinction ratio maintains optimal laser diode performance in a variety of conditions and reduces time spent tuning diodes during assembly", said Peter Real, product line director, High Speed Networking Group, Analog Devices.
"Our unique dual-loop architecture enables the long-term laser diode stability and reliability our customers need to reduce costs and time to market".
The ADN2847 and ADN2848 LDDs actively manage laser diode output power by continuously sensing the transmitted optical signal and correcting it for variations caused by laser diode degradation or changes in operating temperature.
This feature is especially important in uncooled applications, and those that require long-term stability and reliability.
This unique dual-loop architecture enables the drivers to work with any standard monitor photodiode, while avoiding any data format limitations.
Together, the ADN2847 and ADN2848 also provide designers flexibility and are pin-to-pin compatible, so migration is easily achieved to address changing system requirements.
While the ADN2848 targets 50 to 622Mbit/s applications where low cost is a key requirement, the ADN2847 supports data rates from 50Mbit/s up to 3.3Gbit/s.
Both the ADN2847 and the ADN2848 operate from a single +3-3.6V supply.
The ADN2847 and ADN2848 feature modulation currents of up to 80mA and bias currents of up to 100mA.
Additional capabilities include laser fail and degrade alarms, automatic laser shutdown (ALS), bias current monitors and modulation current monitors.
The ADN2847 laser diode driver is available in both 7 x 7mm 48-lead, and 5 x 5mm 32-lead chip-scale packages, and is priced at $23.00 in 1000-piece quantities.
The ADN2848 is available in a 5 x 5mm 32-lead chip-scale package and is priced at $11.25 in 1000-piece quantities.
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