LMP90100_13 Datasheet, PDF (1/69 Pages) Texas Instruments – LMP90100/LMP90099/LMP90098/LMP90097 Sensor AFE System: Multi-Channel, Low Power 24-Bit Sensor AFE with True Continuous Background Calibration

LMP90100
www.ti.com
SNAS510P – JANUARY 2011 – REVISED MARCH 2013
LMP90100/LMP90099/LMP90098/LMP90097 Sensor AFE System: Multi-Channel, Low
Power 24-Bit Sensor AFE with True Continuous Background Calibration
Check for Samples: LMP90100
FEATURES
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•23 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
APPLICATIONS
• Temperature and Pressure Transmitters
• Strain Gauge Interface
• Industrial Process Control
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.
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
TRI-STATE is a registered trademark of National Semiconductor Corporation.
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3
PRODUCTION DATA information is current as of publication date.
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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