155 Mbps Transimpedance Amplifier

The AD8015 is a wide bandwidth, single supply transimpedance amplifier optimized for use in a fiber optic receiver circuit. It is a complete, single chip solution for converting photodiode current into a differential voltage output. The 240 MHz bandwidth enables AD8015 application in FDDI receivers and SONET/SDH receivers with data rates up to 155 Mbps. This high bandwidth supports data rates beyond 300 Mbps. The differential outputs drive ECL directly, or can drive a comparator/ fiber optic post amplifier.

In addition to fiber optic applications, this low cost, silicon alternative to GaAs-based transimpedance amplifiers is ideal for systems requiring a wide dynamic range preamplifier or single-ended to differential conversion. The IC can be used with a standard ECL power supply (-5.2 V) or a PECL (+5 V) power supply; the common mode at the output is ECL compatible. The AD8015 is available in die form, or in an 8-pin SOIC package.

* Differential Outputs

* Low Cost, Wide Bandwidth, Low Noise

* Bandwidth: 240 MHz

* Pulse Width Modulation: 500 ps

* Rise Time/Fall Time: 1.5 ns

Input Current Noise: 3.0 pA/√Hz @ 100 MHz

Total Input RMS Noise: 26.5 nA to 100 MHz

* Wide Dynamic Range

Optical Sensitivity: –36 dBm @ 155.52 Mbps

Peak Input Current: ±350 µA

* Low Power: 5 V @ 25 mA

* Wide Operating Temperature Range: –40°C to +85°C