Medical Applications Guide (Rev. B - Mouser Electronics

Medical ImagingPET Scanners71➔8-Channel, 10- and 12-Bit, 40 to 70MSPS ADCswith Serialized LVDS InterfaceADS5270, ADS5271, ADS5272, ADS5273, ADS5277,ADS5240, ADS5242Get samples, datasheets, evaluation modules and app reports at:www.ti.com/sc/device/PARTnumber(Replace PARTnumber with ADS5270, ADS5271, ADS5272, ADS5273,ADS5277, ADS5240 or ADS5242 )The ADS527x family provides eight high-performance ADCs in a small80-lead TQFP package, making it possible to implement high channelcounts in high-performance ultrasound systems. The low power dissipationper channel extends battery life and allows the ADS527x to be used inportable ultrasounds applications as well. Available in 12-bit, 40 to70MSPS and 10-bit, 65MSPS versions, the ADS527x family has theflexibility to offer solutions across the entire spectrum of ultrasoundsystem applications. The ADS5240 and ADS5242 are 4-channel, 12-bit,40MSP and 65MSPS versions, respectively.Key Features• Eight 12- or 10-bit ADCs in one small 80-pin TQFP package• Conversion rates: 40, 50, 65, and 70MSPS• Power consumption: 123mW per channel at 65MSPS• SNR: 70.5dB for 12-bits at 10MHz IF• Individual channel power downApplications• Medical and other imaging• Portable test equipment• Wireless communicationsHigh-Speed Deserializer Aids Evaluation ofTI’s HS ADCs with Serialized LVDS OutputsADSDeSer-50EVMTo order complete evaluation module go to:http://focus.ti.com/docs/toolsw/folders/print/adsdeser-50evm.htmlThe ADSDeSer-50EVM is designed to interface to TI’s serializedlow-voltage differential signal (LVDS) output data converters with anoperating frequency of up to 70MHz and up to eight simultaneous datachannels. The ADSDeSer-50EVM provides an easy way to examinethe serialized data output from the serialized LVDS data converters bydeserializing the data and converting to a standard parallel data port.As there is no clock embedded, a synchronous clock output is providedseparately, along with the eight channels of data. This EVM can beused to evaluation the following ICs: ADS5270, ADS5271, ADS5272,ADS5273, ADS5240 and ADS5242.EVM Features• Accommodates 10- and 12-bit ADCs with up to 50MSPSsampling rate• LVDS Deserializer for up to 600Mbps• Up to eight channels simultaneously• Synchronous clock signalAlso Supplied• BOM• Datasheet• Populated EVM board• Schematic• User's GuideADCLKIN1 PIN1 NIN2 PIN2 NS/HS/HPLLADCADC6X ADCLK1X ADCLKSerializerSerializerLCLK PLCLK NADCLK POUT 1 POUT 1 NOUT 2 POUT 2 NAn additional application note from Xilinx ® , “Connecting Xilinx FPGAs toTexas Instruments ADS527x Series ADCs” (XAPP774 (v1.2)), is availableon the Xilinx website and describes how to connect a high-speedADS527x IC with serialized LVDS output to a Virtex-II or Virtex-IIPro FPGA. Lower speed ADC527x components can be connected toSpartan-3 FPGAs.IN3 PIN3 NIN4 PIN4 NIN5 PIN5 NS/HS/HS/HADCADCADCSerializerSerializerSerializerOUT 3 POUT 3 NOUT 4 POUT 4 NOUT 5 POUT 5 NTo highlight the performance of both the ADC and the FPGA, thereference design described in the application note uses the ADS5273,which is the highest speed sampling ADC. The ADS5273 interfaces toan XC2V250-6FG256 IC (to fit the Texas Instruments demo board)and to an XC2VP20-6FF896 IC (to fit Xilinx demo boards).IN6 PIN6 NIN7 PS/HS/HADCADCSerializerSerializerOUT 6 POUT 6 NOUT 7 POUT 7 NTo download this application note, go to:http://direct.xilinx.com/bvdocs/appnotes/XAPP774.pdfIN8 PIN8 NIN7 NS/H ADCReferenceRegistersSerializerControlOUT 8 POUT 8 NFor more information or to order TI’s deserializer EVM solution, go to:http://focus.ti.com/docs/toolsw/folders/print/adsdeser-50evm.htmlINT/EXT REF P REF N CS SDATA RESET PDVCMSCLKADS527x functional block diagram.TI’s reference to other companies’ products does not constitute TI’s recommendationor approval of such products for use in any application. See ‘Important Notice.’Texas Instruments 2Q 2007Medical Applications Guide