Medical Applications Guide (Rev. B - Mouser Electronics

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46➔Diagnostic, Patient Monitoring and TherapyComponent Recommendations for AED ApplicationsComponent Recommendations (Continued)Component Description Key Features Benefits Other TI SolutionsProcessors (Continued)MSP430FG461x Ultra Low Power 120 KB Flash, 8 KB RAM, SPI + I 2 C + UART/LIN + IrDA, 12 ch.12-bit ADC, 2 ch.12-bit DAC, A-comp, 3 op amp,16-bit MCU 160 LCD HW multiplierOMAP5910 OMAP Processor Dual-core architecture with both DSP and RISC DSP/BIOS software kernel foundation OMAP5912TMS320C5000 DSP Power efficient, high performancePower Management Productsbq20z90 Battery Fuel Gauge Instant accuracy better than 1% error over lifetime Automatically adjusts for battery aging, battery selfof the batterydischarge and temperature inefficienciesbq24100 Battery Charge Switch mode, 1100kHz switching frequency, >2A d/dt, min current primary charge termination methodManagementcharge currentbq24721 Battery Charge Multi-chemistry and multi-cell sync switch-mode charger High efficiency, pack and system protection functionsManagementbq29330 Battery Safety Battery pack full-protection analog front end Provides individual cell voltages and battery voltageto battery management hostDCP020515D Isolated DC/DC 2W, unregulated, up to 89% efficiency, 106W/in3 EN55022 Class B EMC performance, UL1950 component DCP02 seriesConverterpower densityTPS2041B USB Power Switches USB-compliant power source, short-circuit protection Single-chip power source solution for USB and TPS2051B, TPS2061memory cardsTPS2828 MOSFET Driver 2A output, 14ns rise and fall time, 24ns prop delay, inverting Drives FETs for high-voltage transformer TPS2829 non-invertingversionTPS3836 Voltage Supervisor 220nA supervisor with 10ms/200ms selectable delay time Circuit initialization and timing supervision TPS3809TPS61042 White LED Driver 30V, 500mA switch boost converter, 1MHz switching TPS61140frequencyUCC38C4x PWM Controller 14.9/9V on/off UVLO thresholds, 1MHz frequency, 50% UCC3804, UCC3809duty cycleUCD7100 Digital Control Driver Adjustable current limit, 3.3V, 10mA internal regulator Applications requiring fast local peak currentlimit protectionPreview products are listed in bold blue.New products are listed in bold red.Medical Applications Guide Texas Instruments 2Q 2007
Medical ImagingUltrasound/Portable Ultrasound47➔➔ In This SectionUltrasound/Portable Ultrasound 47Component Recommendations for Ultrasound/Portable Ultrasound 53CT Scanners 55Component Recommendations for CT Scanner Applications 58Magnetic Resonance Imaging (MRI) 59Component Recommendations for MRI Applications 63Digital X-Ray 65Component Recommendations for Digital X-Ray Applications 69PET Scanners 70Component Recommendations for PET Scanner Applications 72Power Management for Medical Imaging 74Ultrasound SystemsUltrasound systems, both medical and industrial, use focal imagingtechniques to achieve imaging performance far beyond what canbe achieved through a single-channel approach. Using an array ofreceivers, a high-definition image can be built by time shifting, scalingand intelligently summing echo energy. The concept of time shiftingand scaling receive signals from a transducer array provides theability to “focus” on a single point in the scan region. By subsequentlyfocusing at different points, an image is assembled.When initiating a scan, a pulse is generated and transmitted fromeach of the 8 to 512 transducer elements. These pulses are timed andscaled to “illuminate” a specific region of the body. After transmitting,the transducer element immediately switches into receive mode. Thepulse, now in the form of mechanical energy, propagates through thebody as high-frequency sound waves, typically in the range of 1 to15MHz. As it does, the signal weakens rapidly, falling off as thesquare of the distance traveled. As the signal travels, portions of thewave front energy are reflected. These reflections are the echoes thatthe receive electronics must detect. Signals reflected immediately willbe very strong, as they are from reflections close to the surface, whilereflections that occur long after the transmit pulse will be very weak,reflecting from deep in the body.Because of limits on the amount of energy that can be put into thebody, the industry must develop extremely sensitive receive electronics.At focal points close to the surface, the receive echoes are strong,requiring little if any amplification. This region is referred to as thenear field. But at focal points deep in the body, the receive echoes willbe extremely weak and must be amplified by a factor of 1000 or more.This region is referred to as the far field. These regions represent thetwo extremes in which the receive electronics must operate.In the high-gain (far field) mode, the limit of performance is the sumof all noise sources in the receive chain. The two largest contributorsof receive noise are the transducer/cable assembly and the receivelow noise amplifier (LNA). In low gain (near field), the limit ofHV MUX/DEMUXFETDriverT/RSwitchesTx BufferAmpLNAVCATGCPassiveLPFRx BufferAmpDACPassiveLPFTxBeamformer(FPGA)ADCBeamformerCentralControl UnitRxBeamformer(FPGA)TransducerCW (Analog)BeamformerADCSpectralDopplerProcessing(D-Mode)Image andMotionProcessing(B-Mode)ColorDoppler (PW)Processing(F-Mode)InterfaceTempSensorClockSourceAudioAmpDisplayAudio OutputPrimary SupplyAnalog Digital I/OSupplyCore SupplyLCD SupplyDC/DC BuckConverterLDODC/DC BuckConverterDC/DC BoostConverterLED SupplyBoostConverterDC/DCControllerSupply VoltageSupervisorReferencePower ManagementUltrasound system block diagram.Texas Instruments 2Q 2007www.ti.com/medicalMedical Applications Guide
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