LMP90077_16 Datasheet, PDF (1/70 Pages) Texas Instruments – Sensor AFE System: Multi-Channel, Low-Power 16-Bit Sensor AFE

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LMP90077, LMP90078, LMP90079, LMP90080
SNAS521H – JULY 2011 – REVISED JANUARY 2016
LMP9007x/LMP90080 Sensor AFE System: Multi-Channel, Low-Power 16-Bit Sensor AFE
With True Continuous Background Calibration
1 Features
•1 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 (LMP90080/LMP90078)
• 4-DIFF / 7-SE Inputs (LMP90080/LMP90079)
• 2-DIFF / 4-SE Inputs (LMP90078/LMP90077)
• 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: 2.85 to 5.5 V
– Operating Temp Range: –40°C to 125°C
– Package: 28 Pin Exposed Pad
2 Applications
• Temperature and Pressure Transmitters
• Strain Gauge Interface
• Industrial Process Control
3 Description
The LLMP9007x and LMP90080 are highly
integrated, multi-channel, low-power 16-bit Sensor
AFEs. 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LMP90077
LMP90078
LMP90079
HTSSOP (28) 9.70 mm × 4.40 mm
LMP90080
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical Sensor Application
VA
VREFP1 VREFN1
VIO
VA
IB1 IB2
SCLK
LM90xxx 16-bit Sensor AFE Family of Products
CSB
Micro-
Product
Channel Configuration
Current Sources
1
VIN0
SDO/DRDYB
Controller
+
...
2
VIN2
LMP90080
SDI
LMP90080 4 Differential/7 Single-Ended
Yes
...
LMP90079 4 Differential/7 Single-Ended
No
3
VIN4
-
...
4
VIN6/VREFP2
D0
LMP90078 2 Differential/4 Single-Ended
Yes
...
LEDs/
VIN7/
D6/DRDYB
Switches _{LMP90077 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.