LMP90080-Q1 Datasheet, PDF (1/65 Pages) Texas Instruments – Multi-Channel 16-Bit Sensor AFE with Background Calibration

LMP90080-Q1
www.ti.com
SNIS186A – MAY 2013 – REVISED JANUARY 2014
LMP90080-Q1 Multi-Channel 16-Bit Sensor AFE with Background Calibration
Check for Samples: LMP90080-Q1
FEATURES
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•23 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
• 4-DIFF / 7-SE Inputs
• 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
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, V_A: +4.75V to +5.5 V
• Operating Temp Range: -40 to +150°C
• Package: 28 Pin Exposed Pad
APPLICATIONS
• Temperature and Pressure Transmitters
• Strain Gauge Interface
• Industrial Process Control
DESCRIPTION
The LMP90080-Q1 is a highly integrated, multi-
channel, low-power 16-bit Sensor AFE. 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.
Another feature of the LMP90080-Q1 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 LMP90080-Q1 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 LMP90080-Q1
a complete analog front-end for low-power, precision
sensor applications such as temperature, pressure,
strain gauge, and industrial process control. The
LMP90080-Q1 is ensured over the extended
temperature range of -40°C to +150°C and is
available in a 28-pin package with an exposed pad.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
WEBENCH is a registered trademark of Texas Instruments.
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All other trademarks are the property of their respective owners.
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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.
Copyright © 2013–2014, Texas Instruments Incorporated