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PDF CMX7262 Data sheet ( Hoja de datos )
| Número de pieza | CMX7262 | |
| Descripción | TWELP Vocoder | |
| Fabricantes | Consumer Microcircuits Limited | |
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CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CMX7262
TWELP Vocoder
D/7262_FI-1.x/4 August 2013
DATASHEET
Advance Information
7262 FI-1.x Professional Radio Vocoder
Features
High-performance, low bit rate vocoder using
TWELP (Tri-wave Excited Linear Prediction)
technology
Crystal clear voice and excellent performance
in real-life radio operation
Excellent performance providing natural-
sounding speech and high quality non-voiced
signals such as emergency services sirens
Half-duplex operation
FEC built in to each vocoder frame
Noise Reduction
Integral voiceband audio codec (No external
DSP or codecs required)
C-BUS host serial interface
o Streaming input and output registers to
streamline transfers and relax host service
latency
Signal routing:
o Choice of input sources – C-BUS transfer
from host, analogue audio input
o Choice of output sources – C-BUS transfer
to host, analogue audio output
Auxiliary functions
o GPIOs
o Two differential audio outputs
o Single-ended speaker output
o Analogue input/output gain adjustment
o Analogue input multiplexer
o Analogue output multiplexer
Low power 3.3V operation with powersave
functions
Small 64-pin VQFN package
Applications
Half duplex digital radio systems
Personal area network voice links
Secure digital voice communications
Secure door access
Wireless PBX
VoIP applications
Digital Software Defined Radio (SDR)
Analogue In
Analogue Out
GPIOs
ADC
DAC
Digital
Filters
FIFO
Digital
Filters
Configuration
Function
Image™
CMX7262
Professional Radio Vocoder - TWELP
3.3V
C-BUS
Host
µC
3.3V
2013 CML Microsystems Plc
1 page  
TWELP Vocoder
CMX7262
History
Version
4
Changes
Initial Encoder Delay added:
Section 6.14: (register summary table) updated
Section 8.1: (register details) updated
Section 8.1.13: register description (Initial Encoder Delay $59) added
Section 9.2: Function Images updated
Miscellaneous typographical and editorial changes
Date
30/08/2013
3 Decoder Noise Gate added:
17/04/2013
Section 2.1: (block diagram) updated
Section 6.11: (Noise Gate) added
Section 6.14: (register summary table) updated
Section 8.1: (register details) updated
Section 8.1.16: new register description (Noise Gate Configuration $5E)
Section 9.2: Function Images updated
2 Test Mode added:
06/09/2012
Section 6.13 (register summary table) updated
Section 8.1 (register details) updated
Section 8.1.9, new register description (Frequency Control $52) added
Section 8.1.19 (description for VCTRL register) updated to include Test
Mode
Section 9.2, Function Images updated
Miscellaneous typographical and editorial changes
Added advice about connection to the exposed metal pad in Q1 package.
1 First approved version
26/07/2012
2013 CML Microsystems Plc
Page 5
D/7262_FI-1.x/4
5 Page 
TWELP Vocoder
4 PCB Layout Guidelines and Power Supply Decoupling
CMX7262
C20 10µF
C21 10nF
C22 10nF
C23 10µF
C24 10nF
C25 10nF
C26 22µF
C27 10nF
C28 10nF
C29 10µF
C30 10nF
C31 100nF
Figure 2 CMX7262 Power Supply and De-coupling
Notes:
To achieve good noise performance, VDD and VBIAS decoupling and protection of the receive path from
extraneous in-band signals is very important. It is recommended that the printed circuit board is laid out
with a ground plane in the CMX7262 area to provide a low-impedance connection between the VSS pins
and the VDD and VBIAS decoupling capacitors.
2013 CML Microsystems Plc
Page 11
D/7262_FI-1.x/4
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet CMX7262.PDF ] | |
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