Overview
The LMP90100MHX/NOPB is a highly integrated, multichannel, low-power, 24-bit Sensor Analog Front-End (AFE) produced by Texas Instruments. This device 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. It is designed for versatility and accuracy in various sensor applications, including temperature, pressure, strain gauge, and industrial process control. The device operates over an extended temperature range of -40°C to 125°C and is available in a 28-pin HTSSOP package with an exposed pad.
Key Specifications
| Parameter | Value |
|---|---|
| Resolution (Bits) | 24 |
| Sample Rate (max) (SPS) | 214.65 |
| Number of Input Channels | 7 |
| Interface Type | SPI 4/3-wire with CRC |
| Input Type | Differential, Single-ended |
| Architecture | Delta-Sigma |
| Reference Mode | External |
| Input Voltage Range (V) | 0 to 5.5 |
| Analog Supply Voltage (V) | 2.85 to 5.5 |
| Digital Supply Voltage (V) | 2.7 to 5.5 |
| Operating Temperature Range (°C) | -40 to 125 |
| Power Consumption (typ) (mW) | 1.2 |
| 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 |
Key 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
- 4-DIFF / 7-SE Inputs and 2-DIFF / 4-SE Inputs
- 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
Applications
- Temperature and Pressure Transmitters
- Strain Gauge Interface
- Industrial Process Control
Q & A
- What is the resolution of the LMP90100MHX/NOPB ADC?
The LMP90100MHX/NOPB has a 24-bit resolution. - What is the maximum sample rate of the LMP90100MHX/NOPB?
The maximum sample rate is 214.65 SPS. - How many input channels does the LMP90100MHX/NOPB support?
The device supports 7 input channels. - What is the operating temperature range of the LMP90100MHX/NOPB?
The operating temperature range is -40°C to 125°C. - Does the LMP90100MHX/NOPB support continuous background calibration?
Yes, it supports true continuous background calibration at all gains. - What types of inputs does the LMP90100MHX/NOPB support?
The device supports differential and single-ended inputs. - What is the power consumption of the LMP90100MHX/NOPB?
The typical power consumption is 1.2 mW. - Does the LMP90100MHX/NOPB have built-in sensor diagnostics?
Yes, it has continuous background open/short and out-of-range sensor diagnostics. - What is the purpose of the excitation current sources in the LMP90100MHX/NOPB?
The excitation current sources are used to excite external sensors such as resistive temperature detectors and bridge sensors. - Is the LMP90100MHX/NOPB supported by any design tools?
Yes, it is supported by WEBENCH Sensor AFE Designer.
