SBOU257 June   2021 PGA2500

 

  1.   Trademarks
  2. 1Product Overview
  3. 2Features
  4. 3Getting Started
    1. 3.1 Electrostatic Discharge Warning
    2. 3.2 Unpacking the EVM
    3. 3.3 Absolute Operating Conditions Warning
  5. 4Setup Guide
    1. 4.1 Analog and Digital Power Supplies
    2. 4.2 Microphone Input
    3. 4.3 Phantom Power Connections
    4. 4.4 DC Blocking Capacitors
    5. 4.5 Protection Network
    6. 4.6 Configurable Input Circuitry
    7. 4.7 Configurable Output Circuitry and Preamp Output Connector
  6. 5Schematic, PCB Layout, and Bill of Materials
    1. 5.1 Schematic
    2. 5.2 PCB Layout
    3. 5.3 Bill of Materials
  7. 6Software Operation
    1. 6.1 Applications Software Overview
    2. 6.2 Using the GUI

4.3 Phantom Power Connections

The PGA2500EVMV2 supports connection of a phantom power source across the inputs of the preamplifier using terminal block J1. The voltage source is connected to the hot (+) and cold (−) sides of the preamplifier input through 6.81-kΩ resistors. Phantom power may be operated at voltages up to +50 V DC.

Phantom power is required for condenser microphones. When using a condenser microphone requiring a phantom power source, short terminals 1 and 2 of jumper JMP1, and leave terminals 3 and 4 open. It is important to note that when using a phantom power source, connect the microphone and cable before turning on phantom power. In addition, phantom power should be turned off before disconnecting the microphone or cable. Making or breaking the input connection with +48 V may cause large transient spikes which could damage the PGA2500 or anything connected to the output. When using a dynamic microphone, terminals 3 and 4 of jumper J3 should be shorted, while terminals 1 and 2 remain open.