Medical Applications Guide (Rev. B - Mouser Electronics

78➔Medical InstrumentsMedical Instrumentation16-Bit, Parallel Input, Multiplying DACDAC8820Get samples, datasheets, evaluation modules and app reports at:www.ti.com/sc/device/DAC8820The DAC8820 is a multiplying DAC designed to operate from a single2.7V to 5.5V supply. The applied external reference input voltagedetermines the full-scale output current. An internal feedback resistorprovides temperature tracking for the full-scale output when combinedwith an external, current-to-voltage precision amplifier. A parallelinterface offers high-speed communications.Key Features• INL: ±0.5LSB• DNL: ±1LSB• 16-bit monotonic• Low noise: 10nV/ Hz• Low power: I DD = 2µA• Analog power supply: +2.7V to +5.5V• Settling time: 0.5µs• 4-quadrant multiplying reference• Reference bandwidth: 8MHz• Packaging: SSOP-28Applications• Instrumentation• Automatic test equipment• Digitally controlled calibration• Industrial controlD0…D15WRDAC8820Parallel BusV DDInputRegisterR1R1R COMR2DACRegisterREFR OFSR OFSDACR FBR FBI OUTAGNDHigh-Voltage, Wideband, FET-Input OperationalAmplifierTHS4631Get samples, datasheets, evaluation modules and app reports at:www.ti.com/sc/device/THS4631The THS4631 is a high-speed, FET-input op amp designed forapplications requiring wideband operation, high-input impedance andhigh power supply voltages. By providing a 210MHz gain bandwidthproduct, ±15V supply operation and 100pA input bias current, theTHS4631 is capable of simultaneous wideband transimpedance gainand large output signal swing. The fast 1000V/µs slew rate allows forfast settling times and good harmonic distortion at high frequencies.Key Features• High bandwidth:• 325MHz in unity gain• 210MHz gain bandwidth product• High slew rate:• 900V/µs (G = 2)• 1000V/µs (G = 5)• Low distortion: –76dB, SFDR at 5MHz• Input bias current: 100pA (max)• Input voltage noise: 7nV/ Hz• Input impedance: 109 || 3.9pF• Wide supply range: ±5V to ±15V• Packaging: SOIC-8, MSOP-8 PowerPADApplications• Wideband photodiode amplifier• High-speed transimpedance gain stage• Test and measurement systems• Current-DAC output buffer• Active filtering• High-speed signal integrator• High-impedance bufferRSTLDACControlLogicDGNDC FDAC8820 functional block diagram.λ–V (Bias)R FR LPhotodiode circuit.Medical Applications Guide Texas Instruments 2Q 2007