LMP90100_16 Datasheet, PDF (1/74 Pages) Texas Instruments – Sensor AFE System: Multichannel, Low-Power, 24-Bit Sensor AFE

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LMP90100, LMP90099, LMP90098, LMP90097
SNAS510S – JANUARY 2011 – REVISED JANUARY 2016
LMP90100 and LMP9009x Sensor AFE System: Multichannel, Low-Power, 24-Bit Sensor
AFE With True Continuous Background Calibration
1 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 WEBENCH^® 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
1
– Analog Voltage, VA 2.85 to 5.5 V
– Operating Temp Range –40°C to 125°C
– 28-Pin HTSSOP Exposed Pad
2 Applications
• Temperature and Pressure Transmitters
• Strain Gauge Interface
• Industrial Process Control
3 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.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
LMP90097
LMP90098
LMP90099
HTSSOP (28)
9.70 mm x 4.40 mm
LMP90100
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Typical Application Schematic
VA
VREFP1 VREFN1
VIO
VA
IB1 IB2
SCLK
LM90xxx 24-bit Sensor AFE Family of Products
CSB
Micro-
Product
Channel Configuration
Current Sources
1
VIN0
SDO/DRDYB
Controller
+
...
2
VIN2
LMP90100
SDI
LMP90100 4 Differential/7 Single-Ended
Yes
...
LMP90099 4 Differential/7 Single-Ended
No
3
VIN4
-
...
4
VIN6/VREFP2
D0
LMP90098 2 Differential/4 Single-Ended
Yes
...
LEDs/
VIN7/
D6/DRDYB
Switches _{LMP90097 2 Differential/4 Single-Ended}
No
VREFN2 GND
CLK/XIN XOUT
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.