Multi-Channel, Low Power 24-Bit Sensor AFE with True Continuous Background Calibration - LMP90100

LMP90100 (ACTIVE)

Multi-Channel, Low Power 24-Bit Sensor AFE with True Continuous Background Calibration

Description

The LMP90100/LMP90099/LMP90098/LMP90097 are highly integrated, multi-channel, 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.

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 - 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 Webench Sensor AFE Designer
  • Automatic Channel Sequencer

Key Specifications

  • ENOB/NFR Up to 21.5/19 bits
  • Offset Error (typ) 8.4 nV
  • Gain Error (typ) 7 ppm
  • Total Noise < 10 µV-rms
  • Integral Non-Linearity (INL max) ±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 -40°C to 125 °C
  • Package 28 Pin HTSSOP exposed pad

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Parametrics Compare all products in Temperature & Pressure Analog Front End

 
# Input Channels
Analog Voltage AV/DD (Max) (V)
Analog Voltage AV/DD (Min) (V)
Applications
Integrated Features
Interface
Resolution (Bits)
Sample Rate (max) (SPS)
Supply Current (mA)
Operating Temperature Range (C)
Rating
Pin/Package
LMP90100 LMP90077 LMP90078 LMP90079 LMP90080 LMP90097 LMP90098 LMP90099
7     4     4     7     7     4     4     7    
5.5     5.5     5.5     5.5     5.5     5.5     5.5     5.5    
2.85     2.85     2.85     2.85     2.85     2.85     2.85     2.85    
RTD/Thermistor
Thermocouple    
RTD/Thermistor
Thermocouple    
RTD/Thermistor
Thermocouple    
RTD/Thermistor
Thermocouple    
RTD/Thermistor
Thermocouple    
RTD/Thermistor
Thermocouple    
RTD/Thermistor
Thermocouple    
RTD/Thermistor
Thermocouple    
Continuous Background Calibration
Current Sources (iDACs)
PGA    
Continuous Background Calibration
Current Sources (iDACs)
PGA    
Continuous Background Calibration
Current Sources (iDACs)
PGA    
Continuous Background Calibration
Current Sources (iDACs)
PGA    
Continuous Background Calibration
Current Sources (iDACs)
PGA    
Continuous Background Calibration
Current Sources (iDACs)
PGA    
Continuous Background Calibration
Current Sources (iDACs)
PGA    
Continuous Background Calibration
Current Sources (iDACs)
PGA    
Serial SPI     Serial SPI     Serial SPI     Serial SPI     Serial SPI     Serial SPI     Serial SPI     Serial SPI    
24     16     16     16     16     24     24     24    
214SPS     214SPS     214SPS     214SPS     214SPS     214SPS     214SPS     214SPS    
0.4     0.4     0.4     0.4     0.4     0.4     0.4     0.4    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
28HTSSOP     28HTSSOP     28HTSSOP     28HTSSOP     28HTSSOP     28HTSSOP     28HTSSOP     28HTSSOP    

Featured tools and software

WEBENCH® SensorAFE LMP90100
 
Sensor AFE Designer
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Companion parts

Part # Name Product Family Comments
LMP90080   Multi-Channel, Low-Power 16-Bit Sensor AFE with True Continuous Background Calibration   Temperature & Pressure Signal Conditioning - Temperature & Pressure Analog Front End    16-bit, 2 matched current source, 4 differential/7 single-ended inputs  
LMP90079   Multi-Channel, Low-Power 16-Bit Sensor AFE with True Continuous Background Calibration   Temperature & Pressure Signal Conditioning - Temperature & Pressure Analog Front End    16-bit, no current source, 4 differential/7 single-ended inputs  
LMP90078   Multi-Channel, Low-Power 16-Bit Sensor AFE with True Continuous Background Calibration   Temperature & Pressure Signal Conditioning - Temperature & Pressure Analog Front End    16-bit, 2 matched current sources, 2 differential/4 single-ended inputs  
LMP90077   Multi-Channel, Low-Power 16-Bit Sensor AFE with True Continuous Background Calibration   Temperature & Pressure Signal Conditioning - Temperature & Pressure Analog Front End    16-bit, no current source, 2 differential/4 single-ended inputs  
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