LMP90078 Datasheet | National Semiconductor

.Data Sheet.co.kr LMP90080/LMP90079/LMP90078/LMP90077 Sensor AFE System: Multi-Channel, Low-Power 16Bit Sensor AFE with True Continuous Background Calibration LMP90080/LMP90079/ LMP90078/LMP90077 August 30, 2011 Sensor AFE System: Multi-Channel, Low-Power 16-Bit Sensor AFE with True Continuous Background Calibration 1.0 General Description The LMP90080/LMP90079/LMP90078/LMP90077 are highly integrated, multi-channel, low-power 16-bit Sensor AFEs. The devices feature a precision, 16-bit Sigma Delta Analogto-Digital Converter (ADC) with a low-noise programmable gain amplifier and a fully differential high impedance analog input multiplexer. A true continuous background calibration feature allows calibration at all gains and output data rates without interrupting the signal path. The background calibration feature essentially eliminates gain and offset errors across temperature and time, providing measurement accuracy without sacrificing speed and power consumption. Another feature of the LMP90080/LMP90079/LMP90078/ LMP90077 is continuous background sensor diagnostics, allowing the detection of open and short circuit conditions and out-of-range signals, without requiring user intervention, resulting in enhanced system reliability. Two sets of independent external reference voltage pins allow multiple ratiometric measurements. In addition, two matched programmable current sources are available in the LMP90080/LMP90078 to excite external sensors such as resistive temperature detectors and bridge sensors. Furthermore, seven GPIO pins are provided for interfacing to external LEDs and switches to simplify control across an isolation barrier. Collectively, these Features make the LMP90080/LMP90079/ LMP90078/LMP90077 plete analog front-ends for lowpower, precision sensor applications such as temperature, pressure, strain gauge, and industrial process control. The LMP90080/LMP90079/LMP90078/LMP90077 are guaranteed over the extended temperature range of -40°C to +125°...