SBAU345A March   2020  – May 2022 PCM1840

 

  1. 1PCM1840 Evaluation Module
    1.     Trademarks
  2. 1Introduction
  3. 2Power Supply
  4. 3Hardware Configuration
    1. 3.1 PCM1840EVM Inputs
      1. 3.1.1 Line Inputs
      2. 3.1.2 Onboard Microphone Input
  5. 4EVM Overview
  6. 5Layer Plots
  7. 6Schematic and Bill of Materials
    1. 6.1 PCM1840EVM Schematic
    2. 6.2 PCM1840EVM Bill of Materials
  8. 7Related Documentation
  9. 8Revision History

3.1 PCM1840EVM Inputs

The PCM1840 device is intended to be driven with differential line inputs or microphone inputs. Each of the inputs has a 1-µF AC coupling film capacitor. Coupled with the 2.5-kΩ input impedance, this sets the high pass filter cutoff frequency at approximately 63 Hz. This can be adjusted by replacing the input AC coupling capacitors on the EVM if necessary. Figure 3-1 shows the architecture of the inputs to the evaluation module. The EVM supports a differential full scale input range of 2 VRMS with an AVDD of 3.3 V.

GUID-CE4CF019-2823-4AA4-B4BD-C0D107ABDC30-low.gif Figure 3-1 PCM1840EVM Input Architecture