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LMP90079 Datasheet(PDF) 1 Page - Texas Instruments |
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LMP90079 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 64 page  LMP90077, LMP90078, LMP90079, LMP90080 www.ti.com SNAS521F – JULY 2011 – REVISED MARCH 2013 LMP90080/LMP90079/LMP90078/LMP90077 Sensor AFE System: Multi-Channel, Low- Power 16-Bit Sensor AFE with True Continuous Background Calibration Check for Samples: LMP90077, LMP90078, LMP90079, LMP90080 1 FEATURES APPLICATIONS 23 • 16-Bit Low-Power Sigma Delta ADC • Temperature and Pressure Transmitters • True Continuous Background Calibration at All • Strain Gauge Interface Gains • Industrial Process Control • In-Place System Calibration Using Expected Value Programming DESCRIPTION The LMP90080/LMP90079/LMP90078/LMP90077 are • Low-Noise Programmable Gain (1x - 128x) highly integrated, multi-channel, low-power 16-bit • Continuous Background Open/Short and Out Sensor AFEs. The devices feature a precision, 16-bit of Range Sensor Diagnostics Sigma Delta Analog-to-Digital Converter (ADC) with a • 8 Output Data Rates (ODR) with Single-Cycle low-noise programmable gain amplifier and a fully Settling differential high impedance analog input multiplexer. A true continuous background calibration feature • 2 Matched Excitation Current Sources from allows calibration at all gains and output data rates 100 µA to 1000 µA (LMP90080/LMP90078) without interrupting the signal path. The background • 4-DIFF / 7-SE Inputs (LMP90080/LMP90079) calibration feature essentially eliminates gain and • 2-DIFF / 4-SE Inputs (LMP90078/LMP90077) offset errors across temperature and time, providing measurement accuracy without sacrificing speed and • 7 General Purpose Input/Output Pins power consumption. • Chopper-Stabilized Buffer for Low Offset Another feature of the LMP90080/LMP90079 • SPI 4/3-Wire with CRC Data Link Error /LMP90078/LMP90077 is continuous background Detection sensor diagnostics, allowing the detection of open • 50 Hz to 60 Hz Line Rejection at ODR ≤13.42 and short circuit conditions and out-of-range signals, SPS without requiring user intervention, resulting in enhanced system reliability. • Independent Gain and ODR Selection per Channel Two sets of independent external reference voltage • Supported by WEBENCH® Sensor AFE pins allow multiple ratiometric measurements. In addition, two matched programmable current sources Designer are available in the LMP90080/LMP90078 to excite • Automatic Channel Sequencer external sensors such as resistive temperature detectors and bridge sensors. Furthermore, seven KEY SPECIFICATIONS GPIO pins are provided for interfacing to external • ENOB/NFR: Up to 16/16 Bits LEDs and switches to simplify control across an isolation barrier. • Offset Error (typ): 8.4 nV Collectively, these features make the LMP90080 • Gain Error (typ): 7 ppm /LMP90079/LMP90078/LMP90077 complete analog • Total Noise: <10 µV-rms front-ends for low-power, precision sensor • Integral Non-Linearity (INL Max): ±1 LSB applications such as temperature, pressure, strain • Output Data Rates (ODR): 1.6775 - 214.65 SPS gauge, and industrial process control. The LMP90080/LMP90079/LMP90078/LMP90077 are • Analog Voltage, VA: +2.85 to +5.5 V ensured over the extended temperature range of - • Operating Temp Range: -40 to 125°C 40°C to +125°C and are available in a 28-pin • Package: 28 Pin Exposed Pad package with an exposed pad. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 WEBENCH is a registered trademark of Texas Instruments. 3 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2011–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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