CMX7861 Programmable Baseband Interface
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Product Preview PP7861/2 March 2012 (programmable DSP/FPGA/microcontroller baseband Interface) 64-pin VQFN The CMX7861 FirmCODEC® is specifically designed as front-end support to a DSP, FPGA or Microcontroller. It provides the necessary analogue to digital and digital to analogue conversion, plus a number of ‘smart’ functions that assist the DSP/FPGA/ Microcontroller. The device is a combination of codec, embedded signal processing and auxiliary systems that together improve overall system performance, reduce development time and overall system cost. Built on FirmASIC® technology, the CMX7861 FirmCODEC® provides flexibility, adaption and product evolution. The CMX7861 FirmCODEC ® is a general-purpose, dual-channel baseband interface device for use in DSP/FPGA/Microcontroller 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. General purpose DSP/FPGA/ Micro analogue interface Sensors Control systems Telemetry/SCADA/Data Digital narrowband radio Digital Mobile Radio (DMR) APCO P25 Software Defined Radio (SDR <6.25kHz to 25kHz channels Worldwide compatibility (ETSI, FCC part 90, ARIB) I/Q Radio/RF interface Tx/Rx: direct connect to zero IF transceiver Simple external RC filters Digital filters configurable for multiple RF channel spacings (DMR default) I/Q trims 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 operates from a 3.3V supply and includes selectable power saving modes. It is available in a 64-VQFN package. Dual signal/channel codecs 144ksps modem mode, 76ksps codec mode Two 16-bit ADCs and Two 14-bit DACs Programmable input and output gain Selectable input/output configuration Differential/single ended inputs/outputs Programmable input/output gain Speaker driver output Digital signal/channel filters Two fully programmable digital filters Filter design and configuration support Codec and modem operating modes C-BUS host serial interface FIFOs and streaming data transfer Master SSP interface External slave device control Serial Flash connection Pass-through mode Low-power 3.0V to 3.6V operation Multiple power-saving options Small 64-pin VQFN Package Intelligent front-end to a DSP/FPGA/microcontroller Flexible interfacing options General-purpose dual channel codec with ‘smart’ functions I/Q-based operation is supported ‘Smart’ functions: Reduce DSP/microcontroller processing overhead Reduce DSP/microcontroller power consumption Eliminate the need for the DSP in some applications Auxiliary functions reduce overall system component count, size and cost Built on FirmASIC ® technology the CMX7861 FirmCODEC ® assists: Reduced development time Provides a fast route to market Flexibility and forward evolution CML’s commitment to maximum support Analogue Systems Analogue Interface System Diagram © 2012 CML Microsystems Plc Digital Systems

CMX7861 DSP/FPGA/Microcontroller Programmable Baseband Interface Product Preview Codec and Modem Operating 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....

CMX7861 DSP/FPGA/Microcontroller Programmable Baseband Interface Product Preview Pin-out and Supply Decoupling Component Value Digital Ground Plane Active low reset from Analogue Ground Plane Evaluation Support Interfacing to a PC can be achieved with our PE0002 universal interface card with GUI and scripts available to assist product Technical Portal Universal Interface Board Evaluation Board not Include mold deflash or protrusions. Mechanical Outline of 64-pin VQFN (Ql) Bottom View nd ex Area 1 is located directly above Index Area 2 Depending on the method of lead termination at the edge...

CMX7861 DSP/FPGA/Microcontroller Programmable Baseband Interface Product Preview Electrical Specification Summary Operating Limits DVDD – DVSS AVDD – AVSS DVCORE – DVSS Supply Voltage: Operating Temperature Xtal Frequency External Clock Frequency DC Parameter - Supply Current All Powersaved AIDD + DIDD Idle Mode AIDD Tx Mode DIDD (DVDD = 3.3V, VDEC = 2.5V) Comprehensive technical datasheet and support material is available from the CML website. Click here to link to the CML website or search for: CMX7861 CML’s proprietary FirmASIC® component technology reduces cost, time to market and...