CMX7241/CMX73411 CML Microcircuits PMR Common Platform COMMUNICATION SEMICONDUCTORS Processor 7241/7341FI-2.x: DMR Air Interface Processor D/7241 7341 FI2.x/14 October 2016 DATASHEET Provisional Information Voice Codec supports external vocoders Features 2 (SPI/PCM/I S compatible - e.g. AMBE+2) Digital DMR Functions: Analogue FM Voice Rx/Tx modes DMR (ETSI TS 102 361-1) Compliant Analogue FM CTCSS/DCS support Air Interface Physical Layer (Layer 1) Analogue FM Selcall, DTMF and 1200 baud Air Interface Data Link Layer (Layer 2) FFSK support Tier 1: peer-to-peer mode (un-licensed) C-BUS Serial Interface to C Tier 2: conventional (licensed) mode Flexible Powersave Modes Tier 3: trunked mode support Low-power (3.3V) Operation Status and Data modes Dedicated hardware reset pin Tx Sequencer Single-ended inputs (CMX7241) Additional Features Differential inputs (CMX7341) 2 Auxiliary ADCs (4 Multiplexed Inputs) Available in LQFP or VQFN Packages 4 Auxiliary DACs (CMX7341 VQFN only) 2 Auxiliary System Clock Outputs Applications Tx Outputs for Two-point or I/Q Modulation Digital Mobile Radio Rx Inputs for Limiter/discriminator or CMX994A Direct Conversion (I/Q) Receiver C-BUS serial interface to CMX994A transceiver C-BUS SSP Tx en (Master) (Master) Rx en Mic in RAM DAC Audio out Tx en Rx en C-BUS Rx in T/R Rx I I In Rx Q Q In CMX994A Direct Conversion Receiver CMX7241/CMX7341 Vocoder PMR Tx out PA (AMBE3000) Common Platform LO in Processor F Ref C Mod 1 out Display Mod 2 out Frac-N PLL Aux DAC C-BUS Keypad VCO Loop Filter Ref Osc (Slave) Clk Master 19.2MHz 2016 CML Microsystems Plc PMR Common Platform Processor CMX7241/7341 1 Brief Description The 7241/7341FI-2 Function Image (FI) implements a half-duplex 4FSK modem and a large proportion of the DMR Air Interface (physical) layer and Data Link layer. In conjunction with a suitable host and an RF transceiver, a compact, low-cost, low-power digital PMR radio conforming to ETSIs DMR standard TS 102 361-1 can be realised. Conventional Analogue modes can be supported by re-loading the device with the 7241/7341FI-1 (I/Q Rx mode or LD Rx mode). The CMX7241 and CMX7341 are identical in functionality the only hardware differences between the two devices are: In the input stage: the CMX7241 has single-ended inputs whereas the CMX7341 is a differential input version, allowing for a direct interface to the CMX994. The CMX7341 uses two serial ports, one to control the CMX994A in C-BUS mode and the second in SPI- Master mode to provide an audio codec interface to an external vocoder. The embedded functionality of the 7241/7341FI-2, managing voice and data systems autonomously, including routing audio signals to/from the Vocoder (via the Auxiliary SPI/C-BUS interface), minimises host microcontroller interactions enabling the lowest operating power and therefore the longest battery life for a DMR radio. From 7241/7341FI-2.3.0.0 onwards, Analogue FM voice and signalling support is available to assist in 1 seamlessly migrating from, or allowing backwards compatibility with, legacy analogue radio modes . The device allows the designer to choose between conventional limiter/discriminator receiver architecture (CMX7241) or an I/Q-based direct conversion architecture (CMX7341) utilising the built-in support for the CMX994A Direct Conversion Receiver. The device utilises CMLs 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 from the 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-2.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: VQFN (CMX7241 and CMX7341) and LQFP (CMX7241 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. 1 Analogue FM Rx functionality is currently optimised only for Limiter/Discriminator mode. 2016 CML Microsystems Plc Page 2 D/7241 7341 FI2.x/14