ONET2804TLP - ONET2804TLP 28 Gbps Low-Power 4-Channel Limiting TIA with RSSI

The ONET2804TLP device is a high-gain, limiting transimpedance amplifier (TIA) forparallel optical interconnects with data rates up to 28 Gbps. The device is used in conjunctionwith a 750-µm pitch photodiode array to convert an optical signal into a differential outputvoltage. An internal circuit provides the photodiode reverse bias voltage and senses the averagephotocurrent supplied to each photodiode.

The device can be used with pin control or a two-wire serial interface to allow controlof the output amplitude, gain, bandwidth, and input threshold.

The ONET2804TLP provides 17.5-GHz bandwidth, a gain of 7.5 kΩ, an input-referred noiseof 2 µA_rms, and a received signal strength indicator (RSSI) for eachchannel. 40-dB isolation between channels results in low crosstalk penalty in the receiver.

The device requires a single 2.8-V to 3.3-V supply and typically dissipates 90 mW perchannel with a differential output amplitude of 300 mV_PP. The device ischaracterized for operation from –40°C to +100°C and is available in die form with a 750-µm channelpitch.

• 4-Channel Multi-Rate Operation: Up to 28 Gbps
• Dissipation at a 3-V Supply: 90 mW per Channel
• Differential Transimpedance: 7.5 kΩ
• Bandwidth: 17.5 GHz
• Input-Referred Noise: 2 µA_rms
• Input Overload Current: 3.2 mA_PP
• Programmable Output Voltage
• Adjustable Gain and Bandwidth
• Received Signal Strength Indicator (RSSI) for Each Channel
• Isolation Between Channels (Die Only): 40 dB
• Single Supply: 2.8 V to 3.3 V
• Pad Control or 2-Wire Control
• On-Chip Filter Capacitors
• –40°C to +100°C Operation
• Die Size: 3250 µm × 1450 µm, 750-µm Channel Pitch

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