30 January 2012

Analogue front end for dsp/fpga/mcu based systems

CML Microcircuits' CMX7861 'FirmCODEC' is a full featured analogue front end for dsp/fpga/microcontroller based systems.

According to CML, the device is a combination of codec, embedded signal processing and auxiliary system support functions, allowing simple interfacing between analogue and digital systems that together improve overall system performance, reduce development time and overall system cost.

Modern day electronic systems, notably communication, control and monitoring are increasingly migrating to digital operations, an area dominated by dsp/fpga/microcontroller signal processing. However, the real world is essentially analogue, making analogue to digital and digital to analogue interfaces a crucial part of the overall design. FirmCODEC is designed to provide this solution.

The device is intended for use in a number of applications including radio systems performing the main data conversion and auxiliary operations for monitoring and control, operating in channel bandwidths up to 50kHz and interfacing rf devices to baseband dsp/fpga/microcontroller. Single ended and differential interface options are provided and I/Q based operation is supported.

Fully programmable on chip independent dual channel, digital channel filters can be utilised for signal conditioning purposes. An Intelligent four channel SAR a/d converter, four independent d/a converters and GPIO subsystems are said to perform valuable functions and minimise host interaction and resources. Two synthesised system clock generators develop clock signals for off chip use. The C-BUS/SPI master interface expands host C-BUS/SPI ports to control external devices.

Two general modes of operation are supported: codec mode and modem mode.

Codec mode is intended for applications where a general purpose codec is required. When in codec mode, the CMX7861 will provide d/a and a/d conversion, and a front end intelligent codec for the dsp/fpga/microcontroller.
Modem mode is suited to applications where the CMX7861 is used to transmit and receive modulated data. Modem mode provides a transmit signal interpolator which is designed to aid in the modulation process by converting mapped symbols to a filtered, modulated output. Receive channel filters are also provided.

The CMX7861 utilises CML's proprietary FirmASIC component technology that enables on chip subsystems to be configured by a Function Image data file, which is uploaded during device initialisation and defines the device's function and feature set. The Function Image can be loaded automatically from a host microcontroller over the C-BUS serial interface or from an external memory device. The device's functions and features can be enhanced by subsequent Function Image releases, facilitating in the field upgrades.

The CMX7861 operates from a 3.3V supply and includes selectable power saving modes. It is available in a 64VQFN package.

Chris Shaw

Supporting Information


CML Microcircuits (UK) Ltd

This material is protected by Findlay Media copyright
See Terms and Conditions.
One-off usage is permitted but bulk copying is not.
For multiple copies contact the sales team.

Do you have any comments about this article?

Add your comments


Your comments/feedback may be edited prior to publishing. Not all entries will be published.
Please view our Terms and Conditions before leaving a comment.

Related Articles

Dev kit features K1 gpu

NVIDIA has launched a development platform which it believes will open the door ...

'Significant' layout launch

Looking to address a range of PCB design challenges, including growing ...

HD audio for Raspberry Pi

A Hi-Fi add-on board, designed to bring HD audio to Raspberry Pi, has been ...

Dev kits for the masses

Raspberry Pi has been a phenomenon. As it celebrates its second birthday this ...

Accuracy enhanced

Many ATE systems are required to measure critical parameters with extreme ...

Integrating analogue

Mixed signal and analogue design has always been considered the 'harder' part ...

Rigid-Flex gudie to success

Designing for rigid flex presents a number of challenges to electronic and ...

Unleashing BeagleBone Black

This whitepaper from Texas Instruments tells you how to make the most of ...

Adding audio

This whitepaper from SiLabs tells you how to add class D audio to embedded ...

Class D audio chipset

International Rectifier has introduced a Class D audio chipset comprising the ...

Class D audio amp

Integrating an advanced 32step up/down volume control, the PAM8407 Class D ...

AdvancedTCA switch

VadaTech has introduced 40/10G Layer 3 managed switches for AdvancedTCA (ATCA).

DLP-enabled PCB lithography

Maskless Lithography uses DLP technology for PCB lithography machines for ...

TDA2x SoC for ADAS

Learn more about how the TDA2x SoC device enables fusion applications in ADAS.

DLP LightCrafter 4500

How to get started using the DLP LightCrafter 4500 evaluation module.

The benefit of experience

Those looking at the electronics industry will sometimes divide it into two ...

Most expensive component

With great apologies to William Shakespeare, "a resistor, a resistor, my ...

Is analogue design getting har

A recent survey by New Electronics suggests that 32% of electronics engineers ...

Tunç Doluca, ceo, Maxim

Maxim is responding to the changing needs of analogue electronics designers. ...

Dr Carsten Suckrow, Analog

The days of semiconductor companies manufacturing and selling discrete products ...

Pete Lomas, Raspberry Pi

The man who designed the hardware for the Raspberry Pi tells Chris Shaw what ...