SBOU259 October   2021 PGA2505

 

  1.   Trademarks
  2. 1Product Overview
  3. 2Features
  4. 3Getting Started
    1. 3.1 Electrostatic Discharge Caution
    2. 3.2 Unpacking the EVM
    3. 3.3 Absolute Maximum Operating Conditions
  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. 5Software Operation
    1. 5.1 Applications Software Overview
    2. 5.2 Using the GUI
  7. 6Schematic, PCB Layout, and Bill of Materials
    1. 6.1 Schematic
    2. 6.2 PCB Layout
    3. 6.3 Bill of Materials

4.3 Phantom Power Connections

The PGA2505EVMV2 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 VDC.

Phantom power is required for condenser microphones. When using a condenser microphone requiring a phantom power source, short pins 1 and 2 of jumper JMP1, and leave pins 3 and 4 open.

CAUTION: Be aware that when using a phantom power source, connect the microphone and cable before turning on phantom power. Make sure to turn off phantom power before disconnecting the microphone or cable. Making or breaking the input connection with 48 V may cause large transient spikes that could damage the PGA2505 or anything connected to the output.

In addition, When using a dynamic microphone, short pins 3 and 4 of jumper J3, and leave pins 1 and 2 open.