CMX7143 Datasheet, PDF (1/5 Pages) CML Microcircuits – Multi-Mode Wireless Data Modem

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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
RF
Transceiver
Tx
Rx
Aux. ADCs
Aux. DACs
Aux. Clocks
Tx Enable
Rx Enable
GPIO
Transceiver control
C-BUS
SPI port connection OR Stored in Host Memory
CMX7143
Multi-Mode
Wireless Data Modem
Tx Trigger
Flash E²
Function Image™
Modulation 1
Function Image™
Modulation 2
Function Image™
Modulation n
Host µC
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
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