Pmod XLR

Warning

This article is still being developed. The information is incomplete and things will change as I flesh out my notes.

Pmod XLR is a project I'm working on that started as a way to connect instruments to a Xilinx 7-series FPGA ADC for DSP, but has since grown into a more advanced platform with:

  • a high-fidelity, high resolution on-board CODEC
  • switchable microphone preamplifiers with digital gain control
  • switchable -20 dB attenuators
  • switchable 48V phantom power
  • user-interface controls that can be digitally twinned
  • headphone driver
  • line-level outputs

All the switches in the signal-path are high-quality Omron relays, providing low insertion loss and high fidelity.