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Transimpedance amplifier offers 21GHz bandwidth, 10k次 gain

Posted: 30 Sep 2014 ?? ?Print Version ?Bookmark and Share

Keywords:100G? transimpedance? amplifier?

Texas Instruments rolled out a 100G transimpedance amplifier (TIA) that serves parallel optical interconnects in applications with data rates of up to 28Gbit/s, such as optical line cards, point-to-point microwave backhauls and video over fibre.

ONET2804T is used in conjunction with a 750?m pitch photodiode array to convert an optical signal into a differential output voltage. An internal circuit provides the photodiode reverse bias voltage and senses the average photocurrent supplied to each photodiode.

The device provides 21GHz bandwidth, a gain of 10k次 and a received signal strength indicator (RSSI) for each channel. It can be used with pin control or a two-wire serial interface to allow control of the output amplitude, gain, bandwidth and input threshold.

The TIA boasts high level of sensitivity, with less than 2?A IRN and virtually no cross talk between channels, which help achieve high signal integrity. It uses two-wire I2C interface, through which designers can optimise their systems to drive high performance at low power consumption.

The part requires a single 3.3V supply and provides a differential output amplitude of 450 mVPP. It is rated for operation from 每40∼C to 100∼C temperatures, and is available in die form with a 750?m channel pitch.

The ONET2804T is available in a 750?m channel-pitch bare die. Price starts at $45 in 1,000-unit quantities.


ONET2804T features a four-channel multi-rate operation up to 28Gbit/s. Source: TI

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