ONET2804T - 28Gbps 4-Channel Limiting Transimpedance Amplifier

The ONET2804T is a high gain limiting transimpedance amplifier for parallel opticalinterconnects with data rates up to 28 Gbps. The device is used in conjunction with a 750 µm pitchphotodiode array to convert an optical signal into a differential output voltage. An internalcircuit provides the photodiode reverse bias voltage and senses the average photocurrent suppliedto 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 ONET2804T provides 21 GHz bandwidth, a gain of 10 kΩ, aninput referred noise of 1.8 µA_rms and a received signal strengthindicator (RSSI) for each channel. 40 dB isolation between channels resultsin low crosstalk penalty in the receiver.

The part requires a single 3.3 V supply and typically dissipates139 mW per channel with a differential output amplitude of 500mV_PP. It is characterized for operation from –40°Cto 100°C temperatures and is available in die form with a 750 µm channel pitch.

To request a full data sheet, please send an email to:onet2804t_request@ti.com.

• 4-Channel Multi-Rate operation up to 28 Gbps
• 10 kΩ Differential Transimpedance
• 21 GHz Bandwidth
• 1.8 µA_rms Input Referred Noise
• 2.9 mA_PP Input Overload Current
• Programmable Output Voltage
• Adjustable Gain and Bandwidth
• Received Signal Strength Indicator (RSSI) for each Channel
• 40 dB Isolation Between Channels (Die only)
• Single 3.3 V Supply
• 139 mW per Channel
• 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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