CMX7261Q1

Telecom Overview

The CMX7261Q1 is a full-duplex multi-transcoder IC from CML Micro, utilizing FirmASIC technology to integrate multiple digital voice coding algorithms on a single chip. It supports Linear PCM, G.711, G.729A, CVSD, and G.723.1 via Function Image uploads. The device operates on a 3.0 V to 3.6 V supply with an operating temperature range of -40°C to +85°C. It features selectable power-saving modes, configurable GPIO, programmable digitally controlled attenuators, and interfaces including a host C-BUS port and a separate master/slave PCM serial interface.

Telecom Feature Summary

• Supports multiple digital voice coding algorithms including Linear PCM, G.711, G.729A, CVSD, and G.723.1 through uploadable Function Images
• Enables both full-duplex and half-duplex operation for flexible voice coding and transcoding applications
• Integrates auxiliary functions such as configurable GPIO, programmable input/output digitally controlled attenuators, and analogue gain adjustment

Telecom Applications

• Digital radio systems
• Personal area network voice links
• Privacy-type digital voice links
• Wireless PABX
• VoIP systems
• Software Defined Radios (SDR)

Telecom Procurement Notes

Verify the specific Function Image version required for your application, as different images support varying codec combinations. Confirm package availability between the 64-pin VQFN and LQFP options during ordering. Ensure that the host system can interface correctly with the C-BUS or PCM ports as specified in the datasheet. Check for any updated Function Images that may provide additional algorithmic support or performance enhancements.

Telecom Selection Notes

Select the appropriate Function Image based on the required codec set; FI-1.x supports G.729A while FI-2.x supports G.723.1. Consider the power consumption profiles of different transcoding modes when designing for battery-operated devices. Evaluate the need for external ADC/DAC components if using the PCM talk-through feature. Ensure the host microcontroller has sufficient processing capability to manage the C-BUS configuration and data transfer.

Telecom Part Context

The CMX7261 belongs to CML’s Dura Talk digital voice processor range, designed to replace discrete DSP solutions for voice coding tasks. Its FirmASIC architecture allows for customization and future algorithm updates without hardware changes. This positions it as a flexible alternative to fixed-function ASICs or general-purpose processors in voice-centric communication systems.

Telecom Replacement Considerations

No direct public substitute part numbers are confirmed for this component. Designers should evaluate other multi-transcoder ICs from CML Micro or competitors offering similar codec sets and interface capabilities. Verify pinout compatibility and software driver availability when considering alternative devices.