CMX655D Ultra-Low Power Voice Codec

By CML Microcircuits 96

CMX655D Ultra-Low Power Voice Codec

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.

  • Digital microphone MEMS support
  • High-efficiency Class D speaker driver
  • Ultra-low power consumption
  • 16-bit audio data
  • Supports conventional telephony and HD voice: 300 Hz to 3.4 kHz and 50 Hz to 7 kHz bandwidths
  • Supports audio bandwidths up to 21 kHz
  • Supports 8 KSPS, 16 KSPS, 32 KSPS, and 48 KSPS sample rates
  • Flexible serial audio interface
  • SPI™/TWI control interface
  • Small 24-lead VQFN package
  • 1.8 V to 3.6 V supply
  • Security alarm panels
  • Glass-break detection
  • Intercom and access systems
  • Mobile radio and accessories
  • Wired telephony
  • Voice controlled equipment