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Applications in the Medical Market

Applications in the Medical Market

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Applications in the Medical Market

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  1. Applications in the Medical Market

  2. Agenda • IV Pump • Challenges & Market Trends • AD7142, AD5259, AD8666, ADuC7026 • EKG • System Overview • AD8220, AD7142, AD7685 • Doppler Blood Flow Monitor • Principles of Operation • AD8334, AD8333, AD7266, SSM2211, ADSP-21375

  3. I-V Pump Block Diagram

  4. Some examples of medical pumps Close-up of peristaltic pump mechanism. Used for some IV pumps and also for feeding pumps. Patient Controlled Analgesic and Epidural Pumps • Use stepper motors for precision control. • Push-button allows patient to control dose rate (within limits set by nurse)

  5. Introducing the ADuC702x Series Analog Output Analog Input Motor Sense Bubble Sense Core and Memory Additional Peripherals Digi-Pot Keypad Motor

  6. 12bit DAC GPIO BandgapReference 12bit DAC VREF 12bit DAC 12bit DAC RAM FlashCode &DataMemory 3-PhasePWM 12bitADC MUX ARM7TDMIMCU 41MHz SPI / I2C TemperatureMonitor WatchdogTimer SupplyMonitor Timers /Counters COMPARATOR JTAGEmulation SerialDownload PLA UART DAC ADuC702x ADuC702x • ADuC70196 ADC, 3 DAC, 6x6mm • ADuC70205 ADC, 4 DAC, 6x6mm • ADuC70218 ADC, 2 DAC, 6x6mm • ADuC702210 ADC, 0 DAC, 6x6mm • ADuC702410 ADC, 2 DAC, 9x9mm • ADuC702512 ADC, 0 DAC, 9x9mm • ADuC702612 ADC, 4 DAC, 14x14mm • ADuC702716 ADC, 0 DAC, 14x14mm

  7. ADuC702x Key Features • And Much More …… • 2 X GP Timers • WDT and Wake-Up Timer • Programmable PLA • UART, SPI and I2Cx2 Serial I/O • Up to 40 Pin GPIO Port • Power Supply Monitor • Three Phase PWM • Other • Specified for 3V operation (5V compatible I/O) • Temperature Range –40°C to +125°C • Packages: 6x6mm 40LFCSP; 9X9mm 64 LFCSP, 64 & 80-pin LQFP (BGA by end of 06) • 2mA/MHz current consumption • Low Cost Development System with Full Third-Party Support • ARM7TDMI MCU Core: • 16-/32-bit RISC architecture • 41MHz operation (Flash & SRAM) • Embedded JTAG for Debug • Memory Organisation • 8K Bytes SRAM in 2K X 32 Bits • 62K Bytes Flash/EE in 31K X 16 Bits • Retention – 20yrs, Endurance – 10K cycles • In-System Programming (ISP) via UART or JTAG Ports • External Memory interface (7026/7) • Analog I/O • Multi-Channel 12-bit, 1MHz ADC • Multiple 12-bit V-Output DACs • 40ppm/°C Vref, +3°C Temp Sensor • Uncommitted Comparator

  8. iCMOS AD8666 Low Cost 16V (+/-8V) 2mV Precision Low Noise, CMOS Rail-Rail Output Op Amps KEY BENEFITS • Low Cost, Low Noise 16V CMOS iCMOSTM Technology • Best in Class for Performance vs. Price over the competition • Excellent JFET alternative • High Voltage Supply in Small Package • +/-8V and +16V w/Rail-Rail output • SOT-23 for single AD8665 2mV, 10 nV/rtHz $0.58 1ku I BIAS TcVOS Noise Bandwidth Vos 10 µV/°C max. 10 nV/√Hz 4 MHz 2mV 1 pA max. AD8665 Single/ AD8666 Dual / AD8668 Quad • Single • SOT-23 & 8-ld SOIC, $0.58 @ 1kunits • Dual • 8-ld MSOP, SOIC, $0.78 @ 1kunits • Quad • 14-ld TSSOP, SOIC, $1.50 @ 1kunits

  9. AD5259 – 8-Bit NV I2C MSOP10 KEY FEATURES • 256-Position • MSOP-10 package • Nonvolatile Memory Maintains Wiper Settings • 5k, 10k, 50k, 100kΩ • I2C Compatible Serial Interface • Tri-state address pins: AD0, AD1Decodes 9 packages on same bus • Wiper Setting Read Back • RAB Tolerance Stored In EEMEM • Single Supply 2.7 V to 5.5 V • Separate VLOGIC and Bias VDD pins • Power-On Refresh < 200ms • 100-Year Data Retention TA=55°C 8-Bit AD5259 6-Bit AD5258 $0.64 @ 100 qty

  10. EKG Block Diagram

  11. Small signals: 0.2 – 2mV pk to pk. BW: 0.05Hz – 150Hz Large high frequency noise (EMG, movement artifacts) DC offset between signals on left & right arm 50/60 Hz interference Body/Lead interface: Requires high input impedance Amplifier Selection: AD8220 High input impedance. JFET Inputs Low current noise Rail to rail outputs. Small package. ½ size of competition Low power. 700uA 76 dB Min CMRR (G = 1) 20 pA Max Input Bias Current 5 pA Max Input Offset Current 1 nA Max Input Offset Current Over Temperature 10 µV/°C Max Input Offset Voltage Drift EXCELLENT AC SPECIFICATONS: 70 dB Min CMRR to 10 kHz (G = 1) 1 MHz –3 dB Bandwidth (G = 1) Low Settling Time 12 µs ECG ExampleSignal Conditioning Challenges

  12. ECG – ADC & VREF Requirements • Balance between performance & power consumption • Oversampling improves performance, but increases power & processing requirements • 16+ bits of resolution typically required • Serial output ADCs are easily isolated from the rest of the system • Low noise, low drift VREF to maintain accuracy • Recommend XFET VREF, like ADR36x • Portable applications need small packages & single supply operation. • Recommend AD7685: • 16 bits & 250KSPS • Low power in MSOP & QFN packages

  13. AD7688- Best ADC in MSOP and QFN PackageHigh Accuracy KEY BENEFITS • High Performance • 500kSPS, 95dB SNR typ • 2.3V to 5V Operation • 16-Bits NMC, 1.5LSB (0.5 typ) INL • Low Power: 1.35mW typ at 100kSPS • Features • Multiple ADC Daisy Chain, Busy Indicator • QFN (SOT23 size) package Also Available in 3X3mm QFN(CSP) Packages Price @ 1k $14.95

  14. Introduction to Capacitance Sensing:Shunt Mode • Excitation source connected to TX generates electric field between TX and RX • Grounded finger interferes with field, reducing total field measured at RX • CDC converts capacitance at RX to digital data • Excitation Source and CDC on chip, RX and TX on external sensor PCB • Contact less • Field range is 2mm+ above plastic sensor covering

  15. AD7142 & AD7142-1Programmable Capacitance to Digital Converter • 16 bit Sigma Delta CDC • 14 inputs • 240kHz Excitation Source • Programmable Sequencer • Update rate is 30Hz • Environmental Calibration • On-chip RAM • Runs automatically • Programmable Sensitivity • Different for each sensor • Serial Interface: SPI(AD7142) & I2C (AD7142-1) • 32-pin 5mm x 5mm LFCSP

  16. Registering a Sensor ActivationAdaptive Thresholds and Sensitivity • Sensor Activation is registered when measured CDC value for that sensor exceeds on-chip threshold • Threshold level can be adjusted on-chip to make sensors more or less sensitive to user touch • Threshold levels are continuously & automatically updated to cater for different fingers sizes

  17. Environmental Calibration • Changes in humidity and temperature can cause the ambient capacitance level measured from the sensors to drift over time. • With no calibration, the threshold levels remain constant. • False sensor activations, or no sensor activation, can occur when the threshold levels are not centred around the ambient value.

  18. Environmental Calibration • As the ambient capacitance value drifts, the on-chip calibration algorithm adjusts the sensor thresholds. • Now, when the sensor is activated, CDC value exceeds threshold and valid touch is registered.

  19. Doppler Blood Flow Monitor Blood Vessel with Red Blood Cells Incident & Reflected Waves Doppler Transducer

  20. Doppler Blood Flow Monitor Examples Transcranial Doppler – measures flow through blood vessels in the brain Veterinary Doppler – Measures blood pressure and blood flow in pets & livestock. Fetal heart monitor for home use:

  21. N P N P O O I I V V L L VPOS CM HILO V VPSL AD8334 V MID COML VGA INH + VOH - LNA G = -48 to 0 POST - + LMD AMP +21dB VOL LNA GAIN BIAS & BIAS CLAMP MODE INT INTERPOLATOR (V ) MID GAIN COMM ENBL ENBV RCLMP COMM AD8334 –100MHz Quad Channel VGA Key Features • LNA: • Ultra-Low Noise: 0.74 nV/rt-Hz; 2.5 pA/rt-Hz • Active Termination Match via External Resistor • VGA: • 48 dB Gain Range • Post-Amplifier with 12 dB Gain Switch • Output SNR Optimized for 10/12 bit ADCs • Fully Differential • Selectable Output Clamping Levels • Applications • Medical Ultrasound • High Performance AGC Systems • Communication Receivers Key Specs • 100 MHz BW • Single +5V Supply • Excellent Overload Behavior • Low Power: 145mW per channel Package (9mm x 9mm) 64-Lead LFCSP

  22. AD8333 –I&Q Demodulator & Phase Shifter Key Features • Dual Integrated I/Q Demodulator • 16 Phase Select on each Output • Quadrature Demod Accuracy • LO & RF Bandwidth – LF - 50 MHz • Baseband Bandwidth >500 kHz (determined by external filtering) • Supply: ±5 V • Power Down • Applications (General Purpose) • Medical Imaging • (CW Ultrasound Beam Forming) • Phased Array Systems • Radar • Adaptive Antennas • Communication Receivers Key Specs • Output Dynamic Range 161 dB/Hz • Power Dissipation (max) 190 mW/ch • Phase Accuracy 0.5° • Amplitude Balance  0.1 dB Package (5mm x 5mm) 32-Lead LFCSP

  23. AD7266: 2-Channel, Simultaneous Sampling ADC • Simultaneous sampling • 2 ADCs onboard • 12-bit • 2 MSPS throughput • 3 differential, 3 pseudo differential or 6 single ended channels • AD7265 is a 1MSPS version • Internal reference • Serial interface • 2 SDATA pins – data in succession if only one serial port • Power down modes – full and partial • 32 lead LFCSP/TQFP package

  24. SSM2211 Audio AmplifierDrives 1W into 8Ω Speaker • Also spec’ed as a 1.5W into 4-ohm speaker amplifier • The amplifier must deliver 300mA+ of output current SPEAKER 4-8W

  25. Audio products for Portable/Wireless Apps • SSM2211 • 1.5W Mono speaker driver (4Ω, <1%THD, 5V Supply) • For any portable application • SSM2250 • 1.5W Mono speaker driver with stereo headphone driver. • Ideal for Palmtop computers, MP3 players, Learning machine and other portable sound devices. • AD8592 • Stereo headphone/line-out driver with shutdown • Very low shutdown current • Low THD and good sound quality at low cost • High drive capability --- 250mA output current • Widely used in portable applications (MP3, Handsets, Games) • AD8541 • Low cost Microphone pre-amplifier • Low power for portable applications • SSM2167 Low Voltage Microphone Conditioner • Cutting edge solution to equalizing microphone volume for maximum performance in speakerphone applications.

  26. ADSP-21375 High Performance 32-bit Floating Point SHARC Processor KEY FEATURES 266 MHz SIMD SHARC Core, capable of 1596 MFLOPS peak performance 0.5 Mbits on chip SRAM 24 zero-overhead DMA channels Digital Applications Interface (DAI) enabling user-definable access to peripherals 4 serial ports (SPORTs) supporting I2S, left-justified sample pair, and TDM modes 2 SPI-compatible ports supporting master and slave modes 1 UART 1 TWI 2 full-featured timers

  27. Package • 208 lead MQFP Package Speed Price 266MHz $9.25 @ 1K ADSP-21375 High Performance 32-bit Floating Point SHARC Processor Benefits • SHARC processor supports 32-/40-bit floating-point operations, featuring ADI's Super Harvard Architecture, with a large on-chip SRAM, and an independent DMA engine with multiple internal busses to eliminate I/O bottlenecks • It is third-generation SHARC Processors, enabling “scalable performance” – customers gain the ability to spread development costs across multiple products based on a single platform design – reducing development time and maximizing return on investment. VisualDSP++ for SHARC Processors • Easy-to-use integrated software development and debugging environment (IDDE). Efficiently manage projects from start to finish from within a single interface. • To take a test drive, visit www.analog.com/aie/testdrive • Or for more information on ADI Processors:www.analog.com/processors

  28. Call to action Distribute booklets to your industrial customers Customers can order samples at special web page Maximum 3 samples per part number, maximum 12 samples per promotion Additional Resources More Medical Solutions from Analog Devices The latest Medical Solutions Bulletin Online seminar:Designing Touch Sensor Interfaces