Product Preview
CMX7143
Multi-Mode Wireless Data Modem
September 2007/2
Function Image™ FI-2.0 = 4FSK Modem Operation
Function Image™ FI-1.0 = GMSK Modem Operation
Features
•
•
•
•
Modulation scheme set by Function Image™
Half-duplex operation
4.8kbps to 19.2kbps data rates
Fast frame sync detection AFSD
(Automatic Frame Sync Detection)
Raw data mode
Flexible packet data mode
(frame sync, payload, CRC and FEC)
‘Air compatible’ mode (CMX909B/FX919B)
Soft decision decoding option
C-BUS serial interface to host micro
RSSI processing
Flexibility built on
FirmASIC
®
technology
Features
(Continued)
2 x auxiliary ADCs with 4 mux I/Ps
4 x auxiliary DACs
2 x auxiliary system clocks
Flexible powersave modes
Low power (3.0V to 3.6V) operation
Small 48-pin LQFP and VQFN packages
•
•
•
•
•
•
•
Applications
Wireless data modems
Software defined modem systems
Point-to-point telemetry systems
M2M applications
Traffic location systems
General wireless telemetry
Transceiver control
Tx
C-BUS
Rx
SPI port connection
Aux. ADCs
OR Stored in Host Memory
RF
Transceiver
Aux. DACs
CMX7143
Multi-Mode
Wireless Data Modem
Flash E
2
Function Image™
Host
µC
Aux. Clocks
Modulation 1
Function Image™
Tx Enable
Modulation 2
Function Image™
Rx Enable
Modulation n
GPIO
Tx Trigger
System Overview Diagram
Brief Description
The CMX7143 is a flexible half duplex, multi-mode wireless data modem IC configured by the Function
Image™ (FI) that is uploaded to the device: GMSK modem operation with FI-1.0 and 4FSK modem
operation with FI-2.0.
The device implements a comprehensive wireless data modem function. Raw data and packet data
modes of operation are available; the packet mode being an enabler to achieve the lowest system
operating power by minimising the host microcontroller interaction. Communication to a host is via a
flexible serial bus (C-BUS). The device includes carrier sense function for LBT (Listen Before Transmit)
applications and can automatically control the transmit hardware, including a RAMDAC feature for PA
ramping.
Other features include two Auxiliary ADCs with four selectable inputs and four auxiliary DAC interfaces
(with an optional RAMDAC on the first DAC output, to facilitate transmitter power ramping). The device
has flexible powersaving modes and RSSI processing and is available in both LQFP and VQFN
packages.
© 2007 CML Microcircuits
1/5