Applications in the Medical Market

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Applications in the Medical Market
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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

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I-V Pump Block Diagram
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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)

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

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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 40C to 125C
• 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, 3C Temp Sensor
• Uncommitted Comparator

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AD8666 Low Cost 16V (/-8V)
iCMOS
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
Vos
Bandwidth
Noise
TcVOS
2mV
4 MHz
10 nV/vHz
10 µV/C max.
1 pA max.
AD8665 Single/ AD8666 Dual / AD8668 Quad

• Single
• SOT-23 8-ld SOIC, 0.58 _at_ 1kunits
• Dual
• 8-ld MSOP, SOIC, 0.78 _at_ 1kunits
• Quad
• 14-ld TSSOP, SOIC, 1.50 _at_ 1kunits

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AD5259 8-Bit NV I2C MSOP10
Key Benefit
LOW PRICE Nonvolatile Compact MSOP-10 Separate Bias supply from logic supply allows wider terminal voltage operation

• KEY FEATURES
• 256-Position
• MSOP-10 package
• Nonvolatile Memory Maintains Wiper Settings
• 5k, 10k, 50k, 100k?
• 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 lt 200ms
• 100-Year Data Retention TA55C

8-Bit AD5259 6-Bit AD5258 0.64 _at_ 100 qty
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EKG Block Diagram
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ECG ExampleSignal Conditioning Challenges

• 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)

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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

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AD7688- Best ADC in MSOP and QFN Package High
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
Resolution Input Channels INL, Max Interface Package
16 Bits 0-VREF 1 1.5LSBs SPI MSOP-10 QFN-10
Price _at_ 1k
14.95
AD7685, AD7686 AD7942, AD7946
Same as AD7688 except AD7685 Single ended,250kSPS, 2 LSB INL max AD7686 Single ended, 500kSPS, 2 LSB INL max AD7687 250k, Differential Same as AD7685 except 14-Bits AD7942/46250K/500KSPS, Single ended, 85dB SNR typ
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Introduction to Capacitance SensingShunt 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

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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

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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

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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.

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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.

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

Package (9mm x 9mm) 64-Lead LFCSP
Sampling Final Release
Now Apr 06

• Key Specs
• 100 MHz BW
• Single 5V Supply
• Excellent Overload Behavior
• Low Power 145mW per channel

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AD8333 IQ 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 gt500 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

Package (5mm x 5mm) 32-Lead LFCSP
Sampling Final Release
Now Released

• Key Specs
• Output Dynamic Range 161 dB/Hz
• Power Dissipation (max) 190 mW/ch
• Phase Accuracy ?0.5
• Amplitude Balance ? 0.1 dB

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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

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SSM2211 Audio AmplifierDrives 1W into 8O Speaker

• Also speced as a 1.5W into 4-ohm speaker
  amplifier
• The amplifier must deliver 300mA of output
  current

SPEAKER 4-8W
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Audio products for Portable/Wireless Apps

• SSM2211
• 1.5W Mono speaker driver (4?, lt1THD, 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.

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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

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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/tes
  tdrive
• Or for more information on ADI Processorswww.ana
  log.com/processors

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• 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