CML Microcircuits' CMX655D ultra-low power voice codec is designed for digital voice and sensor applications that require the ultra-low power consumption such as battery-powered and small form-factor devices.

Traditionally, voice codes have interfaced to electret microphones and speakers providing A to D and D to A functions using precision oversampling data converters. Advances in microphone design using MEMS techniques are changing this, along with higher efficiency speaker driver architectures such as Class D topologies. These advances enable significant reductions in power consumption which are needed to address applications such as voice control that require always-on operation. Such applications are often battery-powered, driving the need for ultra-low power consumption.

The CMX655D addresses these needs by offering ultra-low power and small size. The device interfaces via standard serial buses that are found on many microcontrollers, DSPs, and low-cost single-chip radio transceivers.