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

4.2 Input DC Current Cancellation

The LMH32404 device features an input DC current cancellation circuit that is designed to remove any DC current that is present from a typical current input device such as a photodiode exposed to ambient light. The DC current cancellation circuit does increase the current noise and should be disabled to achieve maximum SNR performance. This feature can be enabled or disabled using the IDC_EN jumper on the board. The DC current cancellation circuit is enabled by default.