Product details


Type Transimpedance and limiting amplifier Data rate (Max) (Gbps) 28 ICC (Typ) (mA) 42 DJ (Typ) (ps) 2 open-in-new Find other Optical networking ICs


  • 4-Channel Multi-Rate operation up to 28 Gbps
  • 10 kΩ Differential Transimpedance
  • 21 GHz Bandwidth
  • 1.8 µArms Input Referred Noise
  • 2.9 mAPP 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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The ONET2804T is a high gain limiting transimpedance amplifier for parallel optical interconnects with data rates up to 28 Gbps. The device is used in conjunction with a 750 µm 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 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 ONET2804T provides 21 GHz bandwidth, a gain of 10 kΩ, an input referred noise of 1.8 µArms and a received signal strength indicator (RSSI) for each channel. 40 dB isolation between channels results in low crosstalk penalty in the receiver.

The part requires a single 3.3 V supply and typically dissipates 139 mW per channel with a differential output amplitude of 500 mVPP. It is characterized for operation from –40°C to 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:

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Technical documentation

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Type Title Date
* Data sheet ONET2804T 28 Gbps 4-Channel Limiting TIA datasheet (Rev. B) Mar. 26, 2018
Technical article Addressing 100G Growing Pains Sep. 22, 2014
Technical article How to design your system like a true pirate engineer Sep. 19, 2014

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