Medical Applications Guide (Rev. B - Mouser Electronics

Consumer and Portable Medical DevicesPortable Medical9➔15ppm/°C (max), 100µA, SOT23-3 SeriesVoltage ReferencesREF3112, REF3120, REF3125, REF3130, REF3133,REF3140Get samples, datasheets, evaluation modules and app reports at:www.ti.com/sc/device/PARTnumber(Replace PARTnumber with REF3112, REF3120, REF3125, REF3130,REF3133 or REF3140)The REF31xx is a family of precision, low-power, low-dropout seriesvoltage references. The REF31xx does not require a load capacitor, butis stable with any capacitive load and can sink/source up to 10mA ofoutput current. Unloaded, the REF31xx can be operated on suppliesdown to 5mV above the output voltage.ProductVoltage (V)REF3112 1.25REF3120 2.048REF3125 2.5REF3130 3.0REF3133 3.3REF3140 4.096Key Features• Low dropout: 5mV• High output current: ±10mA• High accuracy: 0.2% (max)• Low I Q : 115µA (max)• Excellent specified drift performance:• 15ppm/°C (max) from 0°C to +70°C• 20ppm/°C (max) from –40°C to +125°CApplications• Medical equipment• Data acquisition systems• Portable, battery-powered equipment• Handheld test equipment2.5VREF3112V INV OUT = 1.25VGND0.1µF0V to1.25VBasic data acquisition system.V REF+In–InADS8324GNDV CCCSD OUTDCLOCK5Ω1µF to 10µF2.5V SupplyV S1µF to 10µFMicrocontroller1.8V, microPower CMOS Operational AmplifierZerø-Drift SeriesOPA333, OPA2333Get samples, datasheets, evaluation modules and app reports at:www.ti.com/sc/device/OPA333 or www.ti.com/sc/device/OPA2333The OPA333 series of CMOS operational amplifiers uses a proprietaryauto-calibration technique to simultaneously provide very low offsetvoltage (10µV max) and near-zero drift over time and temperature.These miniature, high-precision, low quiescent current amplifiers offerhigh-impedance inputs that have a common-mode range 100mVbeyond the rails and rail-to-rail output that swings within 50mV ofthe rails. Single or dual supplies as low as +1.8V (±0.9V) and up to+5.5V (±2.75V) may be used. The OPA333 family offers excellentCMRR without the crossover associated with traditional complementaryinput stages. This design results in superior performance fordriving analog-to-digital converters (ADCs) without degradation ofdifferential linearity.Key Features• Low offset voltage: 10µV (max)• Zero drift: 0.05µV/°C (max)• 0.01Hz to 10Hz noise: 1.1µV PP• Quiescent current: 17µA• Supply voltage: 1.8V to 5.5V• Rail-to-rail input/output• Packaging: SC70, SOT23Applications• Medical instrumentation• Temperature measurements• Battery-powered instruments• Electronic scales• Handheld equipment+5V0.1mF+- -+ +K- TypeThermocouple40.7mV/°CD1REF3140R 46.04kΩ4.096VR 16.04kΩR 22.94kΩR 6200ΩR 360.4ΩOPA333 in temperature measurement circuit.R 531.6kΩR 2549ΩZero Adj.R 9150kΩ+5VOPA3330.1mF+V OTexas Instruments 2Q 2007Medical Applications Guide