SBOU253 December   2020 LMH32404 , LMH32404-Q1

 

  1. 1Trademarks
  2. 2Introduction
    1. 2.1 Features
    2. 2.2 EVM Specifications
  3. 3Power Connections
  4. 4Input and Output Connections
    1. 4.1 Channel Multiplexer Mode Control
    2. 4.2 Input DC Current Cancellation
    3. 4.3 Enable Function
    4. 4.4 Optional VOCM Pin Connection
    5. 4.5 Option VOD Connection
  5. 5Board Layout
  6. 6Schematic and Bill of Materials
    1. 6.1 Bill of Materials
      1.      Related Documentation

4 Input and Output Connections

The LMH32404RHFEVM is equipped with SMA connectors for easy connection of signal generators and analysis equipment. As shipped, the EVM is configured for a single-ended input and output, both with 50-Ω termination. The differential output of the amplifier is converted to a single-ended output through transformer T1 on the board. OUT+ is the output connector for single-ended output signals, and is terminated to 50-Ω single-ended. To use the EVM with a DC-coupled differential output, remove resistor R7 and transformer T1, and short the connections across the removed transformer input and outputs. When converting to differential, the output resistors may need to be modified to achieve a desired impedance match. See LMH32404 250 MHz, Quad-channel, Differential Output Transimpedance Amplifier applications section, schematics, and layouts for more details and instructions on how to reconfigure the EVM.