IN4701
11.3 Gbps TIA / LIA, 12 kΩ Differential Gain, w/ DCA & TWV (TO Can Padout)

Applications

• TO-can receivers
• SONET OC-192 and SDH STM-64 transponders
• Short, intermediate, long reach, and long haul optical receiver modules
• 10 Gbps Ethernet
• Broadband instrumentation

Features

• Supports data rates up to 11.3 Gbps
• Input sensitivity: -20 dBm
• Input overload: +2 dBm
• Fast rise and fall times: 15 ps
• Low power consumption: 105 mW
• Through-wafer vias on ground pads
• Adjustable DC offset control
• Single +3.3 V power supply
• Available in die form
• Small die size: 880 μm x 1100 μm

Description

The IN4701 transimpedance amplifier / limiting amplifier (TIA / LIA) is designed to support data rates up to 11.3 Gbps.  It maintains an open eye with little duty cycle distortion for inputs up to +2 dBm.  The IN4701 exhibits a typical input sensitivity of -20 dBm while maintaining a BER of 10^–12 (assuming PD ρ = 0.9 A/W, data pattern is 231^-1 PRBS at 11.3 Gbps).

With 12 kΩ of differential gain, the IN4701 eliminates the need for a stand-alone limiting amplifier to amplify signals from the TIA.  The saturated output amplitude of the TIA / LIA is typically 450 mVpp differential.  This part includes an integrated feedback circuit to control the decision threshold of the limiting amplifier, maintaining 50% eye crossing.  In addition, the eye crossing can be externally adjusted through an offset pin, DCA.

To facilitate TO-can assembly, the IN4701 is small (880 μm x 1100 μm), with output pads on opposite sides of the die.  Also, the backside of the TIA is grounded using through-wafer vias so that ground bonds are not required.

The IN4701 has fast rise and fall times and low power consumption.  The TIA / LIA operates from a single +3.3 V power supply and is available in die form.  Evaluation kits are available.

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