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LMP90077 Datasheet

(LMP90077 - LMP90080) Sensor AFE System

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LMP90080/LMP90079/
LMP90078/LMP90077
August 30, 2011
Sensor AFE System: Multi-Channel, Low-Power 16-Bit
Sensor AFE with True Continuous Background Calibration
1.0 General Description
The LMP90080/LMP90079/LMP90078/LMP90077 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 calibra-
tion feature essentially eliminates gain and offset errors
across temperature and time, providing measurement accu-
racy without sacrificing speed and power consumption.
Another feature of the LMP90080/LMP90079/LMP90078/
LMP90077 is continuous background sensor diagnostics, al-
lowing the detection of open and short circuit conditions and
out-of-range signals, without requiring user intervention, re-
sulting 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/LMP90078 to excite external sensors such as re-
sistive temperature detectors and bridge sensors. Further-
more, seven GPIO pins are provided for interfacing to external
LEDs and switches to simplify control across an isolation bar-
rier.
Collectively, these features make the LMP90080/LMP90079/
LMP90078/LMP90077 complete analog front-ends for low-
power, precision sensor applications such as temperature,
pressure, strain gauge, and industrial process control. The
LMP90080/LMP90079/LMP90078/LMP90077 are guaran-
teed over the extended temperature range of -40°C to +125°
C and are available in a 28-pin TSSOP package.
2.0 Features
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
3.0 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)
±1LSB
■ Output Data Rates (ODR) 1.6775 SPS - 214.65 SPS
■ Analog Voltage, VA
+2.85V to +5.5V
■ Operating Temp Range
-40°C to 125°C
■ Package
28-Pin TSSOP
4.0 Applications
Temperature and Pressure Transmitters
Strain Gauge Interface
Industrial Process Control
5.0 Typical Application
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 2011 National Semiconductor Corporation 301697
30169774
www.national.com
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National Semiconductor Electronic Components Datasheet

LMP90077 Datasheet

(LMP90077 - LMP90080) Sensor AFE System

No Preview Available !

www.DataSheet.co.kr
6.0 Block Diagram
FIGURE 1. Block Diagram
30169775
• True Continuous Background Calibration
The LMP90080/LMP90079/LMP90078/LMP90077 feature a
16 bit ΣΔ core with continuous background calibration to com-
pensate for gain and offset errors in the ADC, virtually elimi-
nating any drift with time and temperature. The calibration is
performed in the background without user or ADC input in-
terruption, making it unique in the industry and eliminating
down time associated with field calibration required with other
solutions. Having this continuous calibration improves perfor-
mance over the entire life span of the end product.
• Continuous Background Sensor Diagnostics
Sensor diagnostics are also performed in the background,
without interfering with signal path performance, allowing the
detection of sensor shorts, opens, and out-of-range signals,
which vastly improves system reliability. In addition, the fully
flexible input multiplexer described below allows any input pin
to be connected to any ADC input channel providing addi-
tional sensor path diagnostic capability.
• Flexible Input MUX Channels
The flexible input MUX allows interfacing to a wide range of
sensors such as thermocouples, RTDs, thermistors, and
bridge sensors. The LMP90080/LMP90079’s multiplexer sup-
ports 4 differential channels while the LMP90078/LMP90077
supports 2. Each effective input voltage that is digitized is VIN
= VINx – VINy, where x and y are any input. In addition, the
input multiplexer of the LMP90080/LMP90079 also supports
7 single-ended channels (LMP90078/LMP90077 supports 4),
where the common ground is any one of the inputs.
• Programmable Gain Amplifiers (FGA & PGA)
The LMP90080/LMP90079/LMP90078/LMP90077 contain
an internal 16x fixed gain amplifier (FGA) and a 1x, 2x, 4x, or
8x programmable gain amplifier (PGA). This allows accurate
gain settings of 1x, 2x, 4x, 8x, 16x, 32x, 64x, or 128x through
configuration of internal registers. Having an internal amplifier
eliminates the need for external amplifiers that are costly,
space consuming, and difficult to calibrate.
• Excitation Current Sources (IB1 & IB2) - LMP90080/
LMP90078
Two matched internal excitation currents, IB1 and IB2, can be
used for sourcing currents to a variety of sensors. The current
range is from 100 µA to 1000 µA in steps of 100 µA.
www.national.com
2
Datasheet pdf - http://www.DataSheet4U.net/


Part Number LMP90077
Description (LMP90077 - LMP90080) Sensor AFE System
Maker National Semiconductor
PDF Download

LMP90077 Datasheet PDF






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