Digital Voice

CML Micro’s DuraTALK family of digital voice products comprises a range of flexible technologies supporting voice-data generation, coding, transcoding and decoding functions for digital communication systems, as well as many other in-band audio applications where there is a need for storage and playback.

Product Description Voice-data Scheme Voice-band Codec Supply Voltage
Typ. Current
Package Type Additional Features Key Benefits
CMX655D Ultra-low Power Voice Codec PCM
(linear, A-law, µ-law)
Yes 1.8 - 3.6 300µA 24-VQFN 1W Speaker Driver MEMS microphone support
Ultra-low operating power consumption
CMX7261 Digital Voice Multi-
G.729A, G.711, G.723.1
Yes 3.0 - 3.6 52 64-VQFN I/O Filters Performs as a group of
audio codecs.
CMX618 CMX638 Low-cost 2400bps Vocoder RALCWI ™ Yes 3.0 - 3.6 20 48-VQFN
I/O Filters Low-cost 2400bps Vocoder with robust FEC. CMX638 offer duplex operation.
CMX649 Adaptive Delta Modulation
(ADM) Codec
Yes 2.7 - 5.5 2.9 20-TSSOP
I/O Filters General purpose error
tolerant voice coding scheme.
CMX639 CVSD Voice Codec CVSD Yes 3.0 - 5.5 1.9 16-SOIC
I/O Filters General purpose error
tolerant voice coding scheme.


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