CML Microcircuits releases new RF building block

New function images for CMX7131/7141 digital PMR processor also released

CML Microcircuits releases new RF building block

CML Microcircuits, a provider of low-power semiconductors for the global wireless and two-way radio communications markets, has released a new integrated Quadrature IF/RF Demodulator and Quadrature Modulator.

The CMX973 Quadrature Modulator/Demodulator is the latest RF building block from CML Microcircuits following on from the CMX970 and CMX971. The RF Building Block range is designed to provide the flexible, high performance ICs required for HF/VHF/UHF, professional radios, wireless data terminals, wireless microphones, marine and avionics radio systems.

The CMX973 forms the basis of a high-performance RF transceiver system combining a flexible IF/RF quadrature modulator and quadrature demodulator, in a single chip. Wide signal bandwidth at RF, 0dBm output, low noise and serial bus control delivers maximum flexibility and high-performance, all at an attractive low operating power.

The demodulator is suitable for superheterodyne architectures with IF frequencies of 20MHz to 300MHz and the device may be used in low IF systems or those converting down to baseband. The modulator converts directly from baseband to the desired transmit frequency 20MHz to 1GHz and features quadrature phase correction to minimise unwanted spectral components.

The CMX973’s quadrature architecture supports a wide range of modulation formats and standards. The differential inputs are ideal for direct connection to standard modems and interface ICs such as CML’s CMX7163, CMX7164, CMX910, CMX981 and CMX7861.

The CMX973 is available now, comes in an RF-optimised 32-lead VQFN package, measuring only 5mm x 5mm x 1mm. The CMX973 offers the designer excellent performance, flexibility and fast time-to-market.

The company has also released new function images for the CMX7131 and CMX7141 digital PMR processors.

It has added dPMR (Digital Private Mobile Radio) modes 1, 2 and 3 and ARIB STD-T102 to the CMX7131 and CMX7141. The devices are now digital PMR processors supporting 6 systems and growing; dPMR TS 102 490, DCR ARIB-T98, NXDN, Analogue PMR and now dPMR TS 102 658 and ARIB STD-T102.

The dPMR Mode 1, 2 and 3 Function Image implements a half-duplex 4FSK modem and a large proportion of the dPMR Air Interface, Data Link and Call Control layers. In conjunction with a suitable host and a limiter/discriminator-based RF transceiver, a compact, low-cost, low-power digital PMR radio conforming to ETSI's dPMR standard TS 102 658 can now be realised.

The 7131/7141FI-2.x Function Image implements a half-duplex 4FSK modem and a large proportion of the DCR Air Interface, Data Link and Call Control layers. In conjunction with a suitable host and a limiter/discriminator based RF transceiver, a compact, low cost, low power digital PMR radio conforming to ARIB’s T98 Digital Convenience Radio standard can be realised. Dual mode, analogue/digital PMR operation can also be achieved with the CMX7131/CMX7141.

The embedded functionality of the CMX7131/CMX7141 managing voice and data systems autonomously, including CMX6x8 Vocoder control, minimises host microcontroller interactions enabling the lowest operating power and therefore the longest battery life for a dPMR radio. Third party vocoders are also supported.

The CMX7131 is identical in functionality to the CMX7141 with the exception that two on-chip RF synthesisers have been added.

The devices are available now, have flexible power-saving modes and are available in both LQFP and VQFN packages.




Written by Wireless magazine
Wireless magazine

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