SLVUDF7 October   2025

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Electrostatic Discharge Caution
    3. 1.3 Kit Contents
    4. 1.4 Specification
    5. 1.5 Device Information
    6. 1.6 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 Reference Input
    6. 2.6 Digital Input Pins and Gain Control
    7. 2.7 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

2.1 Setup and Connections

To setup the PGA848EVM:

  1. Reference jumper configuration in Section 2.2.

  2. Connect power supplies as described in Section 2.3.

  3. Connect inputs and outputs as described in Section 2.4.

  4. Bias reference pin as described in Section 2.5.

  5. If desired, change the gain dynamically as described in Section 2.6.

  6. Apply modifications to the board, as needed, referencing Section 2.7.

A basic functional test that can be done without modifications to the hardware is illustrated in Figure 2-2. All gain jumpers must be populated (J10, J11, J12), resulting in a gain of 100 (A2:A0: 111). The ±18V supply (on the input and output stage) allows for a common-mode input range of ±15V and an output range of ±17.6V. Taking into consideration the transfer function of the PGA848 shown in the equation below.

Equation 1. OUT= G×[(IN+) - (IN-)] + VREF

The input in this example has a common-mode voltage of 2V, and the differential voltage of ±50mV. The REF is set to mid-supply of the output power supplies which is 0V. The input in a gain of 100 sets the output signal range to ±5V. To achieve good accuracy for this test, a low-noise precision input source needs to be used.

PGA848EVM PGA848EVM ExampleFigure 2-2 PGA848EVM Example