32 Gb/s Quad Linear Transimpedance Amplifier with SPI Control

    Key Features

    • Quad channel fully differential transimpedance amplifier
    • TIA functions can be controlled digitally thru a Serial Peripheral Interface (SPI Mode) or directly (Analog Mode). The choice of SPI Mode or Analog Mode is user selectable.
    • Excellent linearity and low total harmonic distortion
    • Able to handle large DC input currents
    • Adjustable bandwidth and amplitude frequency response
    • Large dynamic range
    • Manual gain control or AGC modes of operation
    • Adjustable output voltage range in AGC mode
    • Output shutdown function
    • Monitor voltages for the following functions:
      • Receive Signal Strength
      • DC Voltage at each differential input
      • Peak output voltage
      • Automatic Gain Control
    • Compliant with OIF micro-intradyne coherent receiver IA
    • 100 Gb/s Linear Driver: DP-QPSK

    Qorvo's TGA4874 is a quad channel fully differential state of the art TIA with integrated AGC designed for coherent DP-QPSK receivers. It features a very low total harmonic distortion which is not only crucial for DP-QPSK, but also enables higher-level QAM applications. In addition, the TGA4874 has compensating circuits that allow it to handle large DC input currents as well as large offsets between these currents. This is important for colorless applications. The TGA4874 is manufactured in a reliable highspeed SiGe process that combines excellent performance together with cost-effectiveness.

    Typical Applications

      • 100G DP-QPSK with baud rate of 128 Gb/s
      • Coherent QAM modulated systems with baud rates of 200 Gb/s
      • TIA with AGC for long-haul or metro optical receiver modules
    Bandwidth(GHz) 30
    Differential Transimpedance Gain(ohm) 100 to 6,800
    Differential Output Vpp(mV) 200 to 900
    Equivalent Input Noise(pA/rtHz) 20
    Voltage(V) 3.3
    Current(mA) 344
    RoHS Yes
    Lead Free Yes
    Halogen Free Yes
    ITAR Restricted No

    This product appears in the following application block diagrams:

    • Applications > Network Infrastructure > Optical > Optical Systems (10, 40, 100, 200 to 400GB/s)

      Optical Systems (10, 40, 100, 200 to 400GB/s)

    • Applications > Network Infrastructure > Optical > Coherent Transceiver Module

      Coherent Transceiver Module