Medical Applications Guide (Rev. B - Mouser Electronics

30➔Diagnostic, Patient Monitoring and TherapyPulse OximetryDual, Current-Input, 20-Bit Charge Digitizing ADCDDC112Get samples, datasheets, evaluation modules and app reports at:www.ti.com/sc/device/DDC112The DDC112 is a dual input, wide dynamic range, charge-digitizingADC which allows low-level current output ICs to be connecteddirectly to its inputs. Charge integration is continuous as each inputuses two integrators; while one is being digitized, the other isintegrating. In addition to the internal programmable full-scaleranges, external integrating capacitors allow an additional usersettable,full-scale range of up to 1000pC. A high-speed serialshift register, which holds the result of the last conversion, canbe configured to allow multiple, cascaded DDC112s, minimizinginterconnections.Key Features• Single-chip solution for measuring photodiodes• High precision, true integrating function• Low noise: 3.2ppm, rms• Outstanding linearity: ±0.005% INL reading ±0.5ppm FSR• Programmable full-scale: 50 to 1000pc• Single supply: +5V supply• Packaging: SO-28, TQFP-32Applications• Blood analysis• Liquid/gas chromatography• Direct photosensor digitization• Infrared pyrometry1.1nV/ Hz Noise, Low-Power,Precision Op AmpOPA211Get samples, datasheets, evaluation modules and app reports at:www.ti.com/OPA211The OPA211 series achieves very low 1.1nV/ Hz noise density witha supply current of only 3.6mA. It offers rail-to-rail output swing tomaximize dynamic range. In precision data acquisition systems, theOPA211 provides