SLVUDF8 November   2025

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
      1. 1.1.1 Electrostatic Discharge Caution
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
      1. 1.4.1 Hot Surface Warning
  8. 2Hardware
    1. 2.1 Setup and Connections
    2. 2.2 Jumper Settings
    3. 2.3 Power-Supply Connections
    4. 2.4 Analog Input and Output Connections
    5. 2.5 Digital Input Pins and Gain Control
    6. 2.6 Modifications
  9. 3Hardware Design Files
    1. 3.1 PCB Layout
    2. 3.2 Schematic
    3. 3.3 Bill of Materials
  10. 4Additional Information
    1. 4.1 Trademarks
  11. 5Related Documentation

2 Hardware

This EVM provides access to the features and measures the performance of the PGA854 device. By default, the PGA854EVM programmable gain amplifier is configured to a gain of 0.5V/V. The evaluation board provides jumpers J10 (A2), J11 (A1), and J12 (A0) to set the PGA854 gain.

The device uses two sets of voltage supplies: input stage and output stage. The output-stage power supplies are decoupled from the input stage to limit the PGA854 output-swing voltage level protecting the ADC or downstream device against overdrive damage. The input-stage supplies, VS+ and VS–, are accessible using connector J13. The output-stage supplies, LVDD+ and LVSS–, are accessible using connector J14. Selectable jumpers J9 and J16 set the output-stage supply voltage level equal to the input-stage supplies (default), or to external voltages using connector J14.

The PGA854 incorporates features that simplify interfacing to a fully differential ADC. The output common-mode voltage can be independently set by using the VOCM pin. If the VOCM connector is not driven, the output common-mode voltage defaults to the PGA854 output stage mid-supply value. The PGA854EVM allows access to the FDA_IN– and FDA_IN+ pins with optional capacitors C4 and C14. These capacitors are in parallel with the PGA854 output-stage internal-feedback resistors to implement noise filtering. Figure 2-1 displays a simplified block diagram of the PGA854EVM. For a full schematic of the PGA854EVM, see Figure 3-6.

PGA854EVM PGA854EVM Simplified SchematicFigure 2-1 PGA854EVM Simplified Schematic