Analogue/Digital Voice

Audio and voice processing solutions including codecs, scramblers and vocoders for secure, high-quality communication systems.

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JIS C 0920

Analogue/Digital Voice: Secure, High-Quality Voice Communication Solutions

CML Micro’s Analogue / Digital Voice portfolio provides advanced audio processing solutions for secure and high-quality voice communication systems.

The range includes audio codecs, audio scramblers and vocoders, supporting efficient voice compression, signal integrity and secure transmission across a variety of communication platforms.

Designed for integration into professional and mission-critical systems, these devices enable clear, intelligible and reliable voice performance in environments where security, robustness and audio quality are essential. The portfolio supports both analogue and digital voice architectures, helping system designers implement flexible and efficient communication solutions.

Analogue/Digital Voice

Product	Description	Voice-data Scheme	Voice-band Codec	Supply Voltage (V)	Typ. Current (mA)	Package Type	Additional Features	Key Benefits
CMX639	CVSD Voice Codec	CVSD	Yes	3.0 - 5.5	1.9	16-SOIC 24-TSSOP	I/O Filters	General purpose error tolerant voice coding scheme.
CMX649	Adaptive Delta Modulation (ADM) Codec	ADM PCM CVSD	Yes	2.7 - 5.5	2.9	20-TSSOP 20-SOIC	I/O Filters	General purpose error tolerant voice coding scheme.
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

Product	Description	FDMA Systems	TDMA Systems	LD or I/Q Interface	Embedded Functions	Supply Voltage (V)	Typ. Current (mA)	Typ. Power Consumption (mW)	Package type
CMX264	Voice Scrambler	Analogue PMR/LMR	/	/	Frequency Domain Split-band Scrambler IC	3.0 - 3.7	3	/	24-SSOP
CMX7158	Duplex Audio Scrambler	PMR and LMR	/	/	DTMF, Selcall	3.0 - 3.6	6.3	/	48-VQFN
CMX823	Programmable Paging Tone Decoder	Tone Paging	/	LD	Selcall Tone Paging	2.7 - 5.5	1	/	16-SSOP

Product	Description	Voice-data Scheme	Voice-band Codec	Supply Voltage (V)	Typ. Current (mA)	Package Type	Additional Features	Key Benefits
CMX618/638	Low-cost 2400bps Vocoder	RALCWI ™	Yes	3.0 - 3.6	20	48-VQFN 48-LQFP	I/O Filters	Low-cost 2400bps Vocoder with robust FEC. CMX638 offer duplex operation.
CMX7261	Digital Voice Multi- transcoder	ADM, CVSD, PCM 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.