Digital Voice Products CMX7261 Voice Multi Transcoder Voice, PCM, CVSD, G.711 and G.729A Coding, Transcoding and Decoding Features
Full and Half-duplex Operation
Multiple Transcode Support • PCM to CVSD and CVSD to PCM • PCM to G.729A and G.729A to PCM • CVSD to G.729A and G.729A to CVSD • PCM µ-law or A or Linear to PCM µ-law or A or Linear Transcode
7261FI-1.x CVSD/PCM/G729A: Multiple Codec Support • PCM (linear, µ-law, A-law), CVSD, G.729A and G723.1 Codecs
7261FI-2.x PCM/G723.1:
Decoder Functions: •G.711,and G.723.1 decoding to analogue voice
Multiple transcoding support: •PCM to G.723.1 and reverse •PCM to G.711 and reverse •G.711 to G.723.1 and reverse
No External DSP or Codecs Required: Simply upload Function Image™
Transcoder (7261FI-1.x) Routing: • Choice of Input Sources: • C-BUS/Host, PCM Codec, Analogue Audio Input • Choice of Output Sources: C-BUS/Host, PCM Codec, Analogue Audio Output • Voice Activity Detection (VAD)
C-BUS Host Serial Data/Control Interface • SPI-like with Register Addressing • Read/Write 128byte FIFOs and Data Buffers •Streamline Transfers and Relax Host Service Latency
Four Auxiliary GPIO Functions
Encoder Functions: • Analogue voice/Ext. PCM to G.711 and G.723.1 encoding
As a member of the CML DuraTALK® family of digital voice products, the CMX7261 Multi-transcoder IC is a device supporting multiple speech codecs in a single chip. The CMX7261 acts as an audio codec capable of encoding analogue voice into linear µ-law or A-law PCM, CVSD or G.729A data formats. It is capable of decoding PCM, CVSD and G.729A back to analogue voice. It can also transcode data between PCM, CVSD and G.729A. Input and output signals may be passed through the C-BUS interface, the PCM port or the on-chip convertors (ADC/DAC). The device utilises CML’s proprietary FirmASIC component technology. On-chip sub-systems of this voice transcoder IC are configured by a Function Image data file that is uploaded during device initialisation and that defines the device's function and feature set. The Function Image can be loaded automatically from a host µC over the C-BUS serial interface or from an external memory device. The device's functions and features can be enhanced by subsequent Function Image releases, facilitating in-the-field upgrades.
Master/Slave PCM Serial Interface for External Audio Codec
Supply Requirement Range: 3.0 to 3.6 V Applications
Duplex and Half Duplex Digital Radio Systems
Personal Area Network Voice Links
Audio Transcoding Systems Requiring: • PCM Codec • CVSD Codec • Audio Codec • G.729A Codec Privacy-type Digital Voice Communications Wireless PBX Voice over IP (VoIP) Digital Software Defined Radio (SDR)
Download Datasheet
CMX7261 Brief Technical Basics Min
Typ
Max
Units
Support PE0601-7261 EvKit
Typical Supply Current at 3.0 to 3.6 V Idle (DIDD)
670
µA
Idle (AIDD)
17
µA
G.729A Decoder
7.7
mA
G.729A Encoder
19.7
mA
CVSD Decoder
4.4
mA
CVSD Encoder
4.5
mA
G.711 A-law Encoder
4.7
mA
G.711 A-law Decoder
4.6
mA
Transcoding Mode
84
Packages CMX7262Q1 CMX7262L9
64-lead VQFN 64-pin LQFP
Operating temp. -40 to +85°C