SBAU462 June   2024 PCM1809

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  6. 2Hardware
    1. 2.1 Power Supply
    2. 2.2 Hardware Configuration
    3. 2.3 PCM1809EVM Inputs
      1. 2.3.1 Onboard Microphone Inputs
      2. 2.3.2 Line Inputs
  7. 3Hardware Design Files
    1. 3.1 Schematics
    2. 3.2 Layer Plots
    3. 3.3 Bill of Materials
  8. 4Additional Information
    1. 4.1 Trademarks

2.3 PCM1809EVM Inputs

The PCM1809 device is intended to be driven with differential line or microphone inputs. Each of the inputs has a 1µF AC coupling film capacitor. Coupled with the 10kΩ input impedance of PCM1809, this sets the high pass filter cutoff frequency at approximately 16Hz. This can be adjusted by replacing the input AC coupling capacitors on the EVM if necessary. PCM1809 is optimized to support AC/DC coupling in both single-ended or differential input configurations. Figure 3-2 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 3.3V.

PCM1809EVM PCM1809 Input ArchitectureFigure 2-2 PCM1809 Input Architecture