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CMX7861 Datasheet(PDF) 2 Page - CML Microcircuits |
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CMX7861 Datasheet(HTML) 2 Page - CML Microcircuits |
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2 / 58 page  CMX7861 FirmCODEC ® Programmable Baseband Interface CMX7861 2012 CML Microsystems Plc Page 2 D/7861_FI-1.x/2 1 Brief Description 1.1 General The CMX7861 FirmCODEC ® is a general-purpose, dual-channel baseband interface device for use in DSP-based systems. The device is a combination of codec, embedded signal processing and auxiliary system support functions that, together, allow simple interfacing to analogue and digital systems. Single-ended and differential interface options are provided and I/Q-based operation is supported. The device can also be used in radio systems operating with channel bandwidths up to 50kHz, interfacing RF devices to baseband DSP/microcontroller, performing the main data conversion and auxiliary operations for monitoring and control. Fully-programmable on-chip digital channel filters can be utilised for signal conditioning purposes. Intelligent auxiliary ADC, DAC and GPIO sub-systems perform valuable functions and minimise host interaction and host I/O 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. The CMX7861 utilises CML’s proprietary FirmASIC component technology that enables on-chip sub- systems 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 µC 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 64-VQFN package. 1.2 Codec and Modem Modes 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 digital-to-analogue and analogue-to-digital conversion, producing a flat pass band over the sampled bandwidth. Simple programmable transmit and receive filter options are provided but there are no signal interpolation facilities available, and the maximum sample rate is limited. Modem mode is suited to applications where the CMX7861 is used to transmit modulated data and receive that data. Modem mode provides a transmit signal interpolator which will aid in the modulation process by converting mapped symbols to a filtered, modulated output. Receive channel filters are also provided, however filter design is more complex than codec mode as ADC and DAC roll off need to be considered when designing filters. Modem mode is, in general, more efficient than codec mode and is capable of providing a higher sample rate. This datasheet is the first part of a two-part document. |
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