C125 USB-C Analog Headset Module

The USB-C Analog Headset Module (C125) is a USB-IF compliant USB Audio Device with an integrated USB-C plug. It is used to create USB-IF compliant headsets supporting up to 24-bit/384 kHz stereo and up to 24-bit/48 kHz mono (microphone) audio. The C125 is customized to include the headset vendor’s USB descriptors, maximum audio sample rate, and input/output/sidetone EQ using the C125 Image Creator Tool.

C125 USB-C Analog Headset Module

• Configurable sample rate, bit depth, USB descriptor strings, and input/output/sidetone EQ
• Up to 384 kHz stereo headphone-level output and 48 kHz mono microphone input
• Configured through Cirrus Logic C125 Image Creator Tool
• Purchased through Avnet

MEMS Analog Microphone

• Connects to C125 Microphone Bias and Return

Headset Remote and Microphone Transmitter

• Transmits Volume Up, Volume Down, and Center button controls over the microphone bias to C125

Getting Started

1. Purchase Module. Available from Avnet: c125.proscalnext.com

2. Design Hardware. See Accessory Design Guidelines for C125 USB-C Analog Headset Module and Headset Remote and Microphone Transmitter hardware design

3. 

   Configure with Cirrus Logic C125 Image Creator Tool.
   Use the C125 Image Creator Tool to customize the headset with configurations such as:

   • Customer-based USB descriptor strings (Manufacturer, Product Name, VID/PID)
   • Audio Quality (maximum audio sample rate)
   • 7-band parametric input/output EQ and 3-band parametric sidetone EQ

FAQ

• Where do I purchase C125?
  C125 is purchased through c125.proscalnext.com. All purchasing inquiries can be answered through Avnet support once registered through the link.
• Where do I go for hardware design, specifications, and mechanical/electrical drawings?
  See Accessory Design Guidelines: “Apple USB-C Analog Headset Module” and “Headset Remote and Microphone Transmitter.”
• How do I configure C125 USB settings, EQ, and audio settings?
  Download the Cirrus Logic C125 Image Creator Tool software using the link below. For additional support, reach out to c125support@cirrus.com.
• Can C125 be used as an audio adapter?
  C125 USB descriptors are programmed as a headset and cannot be reconfigured. C125 does not support USB-C to 3.5mm headset jack adapters.
• Does C125 convert audio from DSD?
  C125 is converted from PCM and not DSD.

Download C125 Image Creator Tool

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