LMP9007x/LMP90080 Sensor AFE System: Multi-Channel, Low-Power 16-Bit Sensor AFE With True Continuous Background Calibration
1 Features
- 16-Bit Low-Power Sigma Delta ADC
- True Continuous Background Calibration at All Gains
- In-Place System Calibration Using Expected Value Programming
- Low-Noise Programmable Gain (1x - 128x)
- Continuous Background Open/Short and Out of Range Sensor Diagnostics
- 8 Output Data Rates (ODR) with Single-Cycle Settling
- 2 Matched Excitation Current Sources from 100 µA to 1000 µA (LMP90080/LMP90078)
- 4-DIFF / 7-SE Inputs (LMP90080/LMP90079)
- 2-DIFF / 4-SE Inputs (LMP90078/LMP90077)
- 7 General Purpose Input/Output Pins
- Chopper-Stabilized Buffer for Low Offset
- SPI 4/3-Wire with CRC Data Link Error Detection
- 50 Hz to 60 Hz Line Rejection at ODR ≤13.42 SPS
- Independent Gain and ODR Selection per Channel
- Supported by WEBENCH® Sensor AFE Designer
- Automatic Channel Sequencer
-
Key Specifications
- ENOB/NFR: Up to 16/16 Bits
- Offset Error (typ): 8.4 nV
- Gain Error (typ): 7 ppm
- Total Noise: <10 µV-rms
- Integral Non-Linearity (INL Max): ±1 LSB
- Output Data Rates (ODR): 1.6775–214.65 SPS
- Analog Voltage, VA: 2.85 to 5.5 V
- Operating Temp Range: –40°C to 125°C
- Package: 28 Pin Exposed Pad
2 Applications
- Temperature and Pressure Transmitters
- Strain Gauge Interface
- Industrial Process Control
3 Description
The LLMP9007x and LMP90080 are highly integrated, multi-channel, low-power 16-bit Sensor AFEs. The devices feature a precision, 16-bit Sigma Delta Analog-to-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.
Device Information(1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| LMP90077 | HTSSOP (28) | 9.70 mm × 4.40 mm |
| LMP90078 | ||
| LMP90079 | ||
| LMP90080 |
- For all available packages, see the orderable addendum at the end of the datasheet.
Typical Sensor Application
4 Revision History
Changes from G Revision (January 2015) to H Revision
Changes from F Revision (March 2013) to G Revision
- Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section Go
- Added footnote to INL, GE, and Crosstalk specifications.Go
- Changed tDOD1 specification. Go
- Deleted CH_STS and ADC_DOUTM from Compute the CRC... sentence.Go
- Added sentence to the end of the RESET and RESTART section.Go
Changes from E Revision (March 2013) to F Revision
- Changed layout of National Data Sheet to TI formatGo
