CML Microcircuits CMX7031Q1

The CMX7031/CMX7041 FI 1.5 is a full-function, half-duplex, audio, signalling and data processor IC. This makes it a suitable device for both the leisure radio markets (FRS, MURS, PMR446 and GMRS) and for professional radio products (PMR/LMR, Marine and Trunking) with or without signalling and data facilities. The device utilises CML’s proprietary FirmASIC component technology. On-chip sub-systems are configured by a Function Image: this is a data file that is uploaded during device initialisation and defines the device’s function and feature set. The Function Image can be loaded automatically from an external EEPROM or from a host μc ontroller over the built-in C-BUS serial interface. The device’s functions and features can be enhanced by subsequent Function Image releases, facilitating in-the-field upgrades. The CMX7031 features two on-chip RF synthesisers, with easy Rx/Tx frequency changeover, and programmable system clocks to minimise chip count in the final application. The CMX7041 is identical in functionality to the CMX7031 with the exception that the two on-chip RF Synthesisers have been deleted, which enables it to be supplied in a smaller package and with two extra GPIO pins. When loaded with Function Image 1.5, both devices perform simultaneous processing of sub-audio and inband signalling and audio band processing (including frequency inversion scrambling, companding and pre- or de-emphasis). Other features include a complete MSK/FFSK modem for packetised or free-format data, a DSC modem, two auxiliary ADC channels with four selectable inputs and up to 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 is available in both LQFP and VQFN packages.

• Concurrent Audio/Signalling/Data Operations
• Full Audio-band Processing: Pre and De-emphasis, Compandor, Scrambler and Selectable 2.55/3.0 kHz Filters
• 2 x RF Synthesisers (CMX7031 only)
• Inband Signalling: Selcall, DTMF, NOAA NWR
• 6 Analogue Inputs (Mic or Discriminator)
• 2 x Auxiliary ADCs and 4 x Auxiliary DACs
• C-BUS Serial Interface to Host μc ontroller
• Low-power (3.0V to 3.6V) Operation
• Available in 64-pin, 48-pin LQFP and VQFN Packages
• Selectable Audio Processing Order
• MSK/FFSK Data Modem with Packet or Freeformat Modes with FEC, CRC, Interleaving and Scrambling
• Enhanced DSC Modem for Marine Applications, offering support for DSC expansion sequences and transmission of continuous distress signals
• Sub-Audio Signalling: CTCSS, DCS, XTCSS
• Tx Outputs for Single, Two-Point or I/Q Mod.
• 559bps PSK Modulator
• 2 x Auxiliary System Clock Outputs
• Flexible Powersave Modes

• leisure radio markets (FRS, MURS, PMR446 and GMRS)
• professional radio products (PMR/LMR, Marine and Trunking)