24-Bit, 214.6-SPS, 7-ch delta-sigma ADC for sensors with 2x IDACs
Product details
Parameters
Package | Pins | Size
Features
- 24-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 to 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 (LMP90100/LMP90098) - 4-DIFF / 7-SE Inputs (LMP90100/LMP90099)
- 2-DIFF / 4-SE Inputs (LMP90098/LMP90097)
- 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 WEBENCHR Sensor AFE Designer
- Automatic Channel Sequencer
- Key Specifications
- ENOB/NFR Up to 21.5/19 Bits
- Offset Error (Typical) 8.4 nV
- Gain Error (Typical) 7 ppm
- Total Noise < 10 µV-rms
- Integral Nonlinearity (INL Maximum) ± 15 ppm
of FSR - Output Data Rates (ODR) 1.6775 - 214.65
SPS - Analog Voltage, VA 2.85 to 5.5 V
- Operating Temp Range –4°C to 125°C
- 28-Pin HTSSOP Exposed Pad
Description
The LMP90xxx is a highly integrated, multichannel, low-power, 24-bit Sensor AFEs. The devices features a precision, 24-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.
Another feature of the LMP90100/LMP90099/LMP90098/LMP90097 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 LMP90100/LMP90098 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 LMP90100/LMP90099/LMP90098/LMP90097 complete analog front-ends for low-power, precision sensor applications such as temperature, pressure, strain gauge, and industrial process control. The LMP90100/LMP90099/LMP90098/LMP90097 are ensured over the extended temperature range of –40°C to +125°C and are available in a 28-pin HTSSOP package with an exposed pad.
Similar but not functionally equivalent to the compared device:
Technical documentation
| Type | Title | Date | |
|---|---|---|---|
| * | Datasheet | LMP90100 and LMP9009x Sensor AFE System: Multichannel, Low-Power, 24-Bit Sensor AFE With True Continuous Background Calibration datasheet (Rev. S) | Jan. 26, 2016 |
| User guides | SPIO-4 Precision Signal-Path Controller Board User Guide (Rev. A) | May 05, 2018 | |
| Application notes | Digital Filter Types in Delta-Sigma ADCs | Jun. 27, 2017 | |
| Application notes | LMP90100 True Continuous Background Calibration (Rev. B) | May 01, 2013 | |
| Application notes | MSP430 Interface to LMP90100 Code Library Application Report (Rev. A) | May 01, 2013 | |
| Application notes | Microcontroller Firmware Considerations for the National LMP90100 Sensor AFE (Rev. A) | May 01, 2013 | |
| User guides | LMP90100 Sensor AFE Evaluation Board User's Guide (Rev. A) | Jul. 31, 2012 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
ADC-INPUT-CALC is an online tool that provides support for designing the input buffer to an analog-to-digital converter (ADC). It offers 24 different op-amp based buffer circuits that can be used to drive an ADC input. The available topologies cover differential, single-ended and transformer-coupled (...)
Description
Already own the LMP90100EB and SPIO-4 boards? |
The LMP90100EB is the evaluation board for the LMP90XXX family. In order to interface this board to a PC, a SPIO-4 digital controller board (order both boards separately) is required (...)
Features
Contents:
- LMP90100 Evaluation Board
Additional Tools required for evaluation:
- Temperature, pressure, or strain-gauge sensor of your choice (optional)
- SPI0-4 digital controller board (order this board separately)
- LMP90100EB User's Guide
- WEBENCH® Sensor AFE Design Software and LMP90100 Evaluation (...)
Description
The SPIO-4 Digital Controller board is used to read registers, write registers, and capture data from various TI's Sensor AFE and other signal path products. The device evaluation board (for example: LMP90100EB) should be equipped with the GPSI-16 or GPSI-32 header to connect to the SPIO-4 board (...)
Software development
Design tools & simulation
Features
- Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
- Noise calculations
- Common unit translation
- Solves common amplifier circuit design problems
- Gain selections using standard resistors
- Filter configurations
- Total noise for common amplifier configurations
- (...)
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| HTSSOP (PWP) | 28 | View options |
Ordering & quality
Support & training
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Training series
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Hands-on Experiment – System Power Scaling
This hands-on experiment shows the impact that ADC sampling rate has on the system power consumption.
