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CMX7241 Datasheet(PDF) 2 Page - CML Microcircuits |
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CMX7241 Datasheet(HTML) 2 Page - CML Microcircuits |
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2 / 94 page  PMR Common Platform Processor CMX7241/CMX7341 2015 CML Microsystems Plc Page 2 D/7241_7341_FI1.x/4 1 Brief Description The 7241/7341FI-1.x Function Image™ (FI) implements a half-duplex 4FSK modem and a large proportion of the dPMR TM Air Interface (physical) layer and Data Link layer. In addition, the device also supports Analogue FM voice modes with flexible signalling options. In conjunction with a suitable host and an RF transceiver, a compact, low-cost, low-power digital PMR radio conforming to ETSI’s dPMR TM standard TS 102 658 and Analogue EN 300 086 / TIA 603D can be realised. The device analyses incoming traffic, detects the modulation type and switches to the associated operating mode. This ensures that dual mode, analogue/digital PMR/ dPMR TM operation can be achieved on a single radio platform without the need to re-configure hardware or software by loading alternative FIs. The CMX7241 and CMX7341 when loaded with the FI are identical in functionality; the only difference between the two devices is in the input stage: the CMX7241 has single-ended inputs and the CMX7341 is a differential input version. The embedded functionality of the 7241/7341FI-1.x, managing voice and data systems autonomously, including CMX6x8 RALCWI Vocoder or CMX7262 TWELP Vocoder control (via the Auxiliary SPI/C-BUS interface), minimises host microcontroller interactions enabling the lowest operating power and therefore the longest battery life for a dPMR TM radio. The CMX7241/7341 can also provide audio codec functionality for vocoders under direct host control. The in-built signalling options allow the device to be implemented into legacy Analogue FM systems making use of CTCSS / DCS sub-audio signalling, Selcall / DTMF signalling or 1200/2400 bps FFSK trunked systems using MPT1327 or custom protocols. Both digital and analogue functionality can be active at the same time, allowing the host to auto-detect the type of signalling on the channel. The device allows the designer to choose between a conventional limiter/discriminator receiver architecture or an I/Q-based direct conversion architecture utilising the built-in support for the CMX994 Direct Conversion Receiver. 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 serial memory or host microcontroller over the built-in C-BUS serial interface. The device's functions and features may be enhanced by future Function Image™ releases, facilitating in-the-field upgrades. This document refers specifically to the features provided by Function Image ™ 7241/7341FI- 1.1.x.x 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 is available in the following packages: CMX7241 (VQFN and LQFP), CMX7341 (VQFN only). Note that text shown in pale grey indicates features that will be supported in future versions of the Function Image™. This datasheet is the first part of a two-part document comprising datasheet and user manual: the datasheet/user manual combination can be obtained by registering your interest in this product with your local CML representative. |
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