The CMX7241/CMX7341 provides a common platform to support digital and analogue FDMA and 2-slot TDMA PMR/LMR.
Based on CML’s FirmASIC® component technology, a Function Image™ (FI) upload determines the CMX7241/CMX7341 overall function and operating characteristics. The CMX7241 and CMX7341 provide the same system functionality and can accept the same FI but are targeted at different system implementations:
The combination of CMX7341 and CMX994A/E ICs enables a small, low cost, low power consumption multi-standard PMR/LMR system to be realised.
Four Function Images are available, these can be downloaded from the CML Technical Portal (contact for access):
Devices are available through our distributors below:
Function Images
dPMR™ Air Interface + Analogue PMR/LMR – Function Image™ 7241/7341FI-1.x
DMR Air Interface + Analogue PMR/LMR – Function Image™ 7241/7341FI-2.x
NXDN + ARIB STD-T98/102 + Analogue PMR – Function Image™ 7241/7341FI-3.x
APCO P25 + Analogue PMR – Function Image™ 7241/7341FI-4.x
Function Image™ Roadmap includes:
Other features include: two auxiliary ADCs with four selectable inputs, four auxiliary DAC interfaces (with an optional RAMDAC on the first DAC output, to facilitate transmitter power ramping), GPIO and System Clock possibilities.
The devices have flexible powersaving modes and are available in the following packages: VQFN (CMX7241 and CMX7341) and LQFP (CMX7241 only).
CMX7341 Questions
Q: When using the CMX7341 I/Q AGC functionality, the currently used I/Q AGC step is reported back in the Aux 1 Data and Status Register ($A9). How do these steps relate to the current actual gain settings within the CMX994A/CMX994E and CMX7341 devices?
A: The gain adjustment steps are automatically controlled by the CMX7341 when I/Q AGC is enabled. When setting the optimal I/Q input signal level the CMX7341 will adjust its analogue input gain stage and LNA/VGA gain stages of the CMX994A/CMX994E. The reported step gain breakdown is as follows:
| AGC Steps | CMX994AE LNA Gain dB | CMX994AE VGA Gain dB | CMX7341 Input Gain dB | Total Gain dB |
|---|---|---|---|---|
| 8 | 0 | 0 | 19.2 | 19.2 |
| 7 | 0 | 0 | 12.8 | 12.4 |
| 6 | 0 | 0 | 6.4 | 6.4 |
| 5 | 0 | 0 | 0 | 0 |
| 4 | -12 | 0 | 0 | -12 |
| 3 | -18 | -6 | 0 | -24 |
| 2 | -18 | -18 | 0 | -36 |
| 1 | -18 | -30 | 0 | -48 |
| 0 | -18 | -42 | 0 | -60 |
A pair of scripts to realise analogue PMR voice transmission. Requires 2 x PE0403-734x Evaluation kits and 2 x PE0003 Controller kits.
This Configuration Guide is intended to illustrate the signal routing through the CMX7241 and CMX7341 as a visual aid to configuring the device for each specific operation. It is currently specific to Function ImagesTM 7241/7341FI-1.1.x.x but will be largely suitable for later revisions. The Configuration Guide is not intended to cover all of the hardware, functions or possible set-up modes. It is a virtual representation of the device and does not reflect the true architecture.
| PE0003
|
The PE0003 Evaluation Kit Interface Card is a global interface system for use with evaluation kits for CML’s new generation ICs, including FirmASIC™ based products. This greatly simplifies the approach to the evaluation and design-in process.
Documents |
| PE0403
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The PE0403 Platform Evaluation Kit is designed to assist in the evaluation and application development of the CMX724x and CMX734x ranges of FirmASIC® products.
Documents |
Knowledge Base
PE0403 724x Board Schematics. – Download PE0403-734x Board Schematics. – Download PE0403-7241 PE0403-7341 Quick Start. A simple guide to help users get started evaluating with the PE0403-7241 and PE0403-7341. – Please register or login to download PE0403-7341 Quick Start. A simple guide to help users get started evaluating the CMX7341 using a Direct Conversion Receiver, the CMX994E, as an analogue PMR receiver. Kits required: PE0403-7341, EV9942E and PE0003.- Please register or login to download C-BUS Guides. Guides to operation and interfacing. – Download |
