CMX148 Datasheet, PDF (1/75 Pages) CML Microcircuits – Programmable Voice Scrambler

CML Microcircuits
CMX148
PMR Audio and Data Processor
COMMUNICATION SEMICONDUCTORS
D/148/6 November 2010
Audio Processing, DTMF and FFSK/MSK Data Modem
with Auxiliary Functions for use in Analogue PMR Systems
Features
• Concurrent Audio/Signalling/Data Operations
• Complete Audio-band Processing:
o Selectable Audio Processing Order
o Pre and De-emphasis
o Selectable 2.55/3.0 kHz Filtering
o Selectable Audio HPF Cut-off
o Compandor
o Limiter
• Programmable Voice Scrambler
• MSK/FFSK Data Modem with Packet or Free-
format Modes with FEC, CRC, Interleaving and
Scrambling
• DTMF and Audio Tone Encoder/Decoder
• Routing to Support Host µController Signalling
• Dual Auxiliary ADC, 4 Multiplexed Inputs
• 4 x Auxiliary DACs
• Dual Programmable System Clock Outputs
• Tx Outputs for Single, Two-Point or I/Q
Modulation
• Microphone and Discriminator Analogue
Inputs
• Digital Gain Adjustment
• Default 3.6864MHz Xtal/Clock
• C-BUS Serial Interface to Host µController
• Flexible Powersave Modes
• Low-power 3.3V Operation
• Sub-Audio Signalling Filters for CTCSS and DCS • Small VQFN and LQFP Packages
Audio Out
Mic Input
Auxiliary
Multiplexed
ADC Inputs
Filtered Signal for Host Decoding
Auxiliary
DACs
Host Generated Signalling
IRQ
CMX148
PMR Voice and Data
Processor
Modulator
Host µC
Discriminator
C-BUS
Reference Clock
3.3V Supply
RF
Tx Enable
Rx Enable
System Clock 1
System Clock 2
1. Brief Description
The CMX148 is a half-duplex, audio, signalling and data processing IC for use in PMR systems that utilise
the host µC to perform signalling, including CTCSS/DCS encoding/decoding. The device is intended for
use in general leisure and professional PMR terminals.
Comprehensive audio processing facilities include complete audio processing, filtering, companding, pre-
or de-emphasis and frequency inversion scrambling. The CMX148 features an FFSK/MSK data modem
for packetised or free-format data operations. Signal routing and filtering is included to assist host µC
based signal encoding/decoding applications.
A DTMF encoder/decoder, a full complement of auxiliary ADCs and DACs and dual synthesised clock
outputs are included in this low power PMR processor. The device also has flexible powersaving modes
and is available in 48-pin VQFN and LQFP packages.
© 2010 CML Microsystems Plc