CMX7161 Datasheet, PDF (1/4 Pages) CML Microcircuits – TDMA Digital Radio Processor

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CMX7161
TDMA Digital Radio Processor
Digital Mobile Radio (DMR) based systems
PP/7161/1 September 2013
Small 64-pin VQFN/LQFP
Introduction
2-slot TDMA is the digital radio
technology chosen by many
business critical PMR/LMR users
in the market today. DMR has
become a force within the digital
radio market, with its strong
foundation based on the ETSI
DMR standard.
A number of 2-slot TDMA
systems are currently being
implemented around the world,
these include DMR, PDT and
APCO P25 phase 2.
All these systems have the
essential market drivers: small
size, high performance, low cost
and fast time to market. In
many cases the software defined
radio (SDR)/radio platform
approach is the chosen route to
market in order to achieve the
core requirements.
The CMX7161 Digital Radio
Processor, combined with the
CMX994 Direct Conversion
Receiver, provides the ultimate
solution to achieve the 2-slot
TDMA market objectives.
The CMX7161 and CMX994 are
supported by the DE9943 SDR
demonstrator board that
provides a fast route to product
evaluation and system
development.
Applications
 2-slot TDMA Digital
Mobile Radio
 ETSI TS 102 361 Digital
Mobile Radio (DMR)
 Police Digital Trunking
(PDT) Radio
CMX7161 Brief Description
The CMX7161 is a digital radio processor intended for use in two-slot TDMA systems.
Function Image 7161FI-1.x implements a high performance radio modem specifically
targeted at the ETSI TS 102 361 standard for Digital Mobile Radio (DMR).
7161FI-1.x implements a half-duplex digital radio modem using root-raised-cosine
(=0.2) 4-FSK modulation in a 12.5kHz channel. Slot timing and synchronisation are handled
automatically by the device.
An integrated analogue interface (with no requirement for external codecs) supports direct
connection to the RF receive chip CMX994 Direct Conversion Receiver and in Tx, a two-point
modulation transmitter with a few external components can be implemented.
Intelligent auxiliary ADC, DAC and GPIO sub-systems are provided to minimise required host
interaction and host I/O resources. Two synthesised system clock generators develop clock
signals for off-chip use. The C-BUS/SPI master interface expands host C-BUS/SPI ports to
control external devices.
The CMX7161 operates from a 3.0V - 3.6V supply and is available in small 64-pin VQFN and
LQFP packages.
The device uses CML’s proprietary FirmASIC ^® component technology. On-chip sub-systems are
configured by a Function Image™ data file that is uploaded during device initialisation to define the
device's function and feature set.
Features
 9600bps 4FSK modem
 Hard/soft decision data bits
 Root-raised-cosine pulse shaping
 Automatic Frame sync detection
 Automatic tracking of symbol timing and
input I/Q dc offsets
 Embedded codecs (Analogue to digital
conversion)
 RAMDAC capability for PA ramping control
 Two-point modulation analogue outputs
 Direct connection to CMX994 Direct
Conversion Receiver IC
 Auxiliary Functions:
 Two programmable system clock
outputs
 Four ADCs with six selectable input
paths
 SPI Thru-port for interfacing to
synthesisers and other serially
controllable devices
 Four DACs
 FIFO based C-BUS interface for efficient
data transfer
 Small 64-pin VQFN/LQFP packages
Rx
Tx
CMX994
Direct Conversion
Receiver
I INPUT
Q INPUT
CMX7161
TDMA Digital Radio
Processor
Codec
DMR
Modem
PA
VCO 2 POINT MOD
Aux
ADCs
GPIOs
Aux
DACs
System
Clocks
Memory
C-BUS
Host
Micro
Vocoder
Display
Keypad
Codec
© 2013 CML Microsystems Plc
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