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PDF LMP90080 Data sheet ( Hoja de datos )
| Número de pieza | LMP90080 | |
| Descripción | (LMP90077 - LMP90080) Sensor AFE System | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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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
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
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7.0 Ordering Information
Product
LMP90080
LMP90079
LMP90078
LMP90077
Channel Configuration
4 Differential / 7 Single-Ended
4 Differential / 7 Single-Ended
2 Differential / 4 Single-Ended
2 Differential / 4 Single-Ended
Current Sources
Yes
No
Yes
No
Order Code
LMP90080MH/NOPB
LMP90080MHE/NOPB
LMP90080MHX/NOPB
LMP90079MH/NOPB
LMP90079MHE/NOPB
LMP90079MHX/NOPB
LMP90078MH/NOPB
LMP90078MHE/NOPB
LMP90078MHX/NOPB
LMP90077MH/NOPB
LMP90077MHE/NOPB
LMP90077MHX/NOPB
Temperature Range
Description
−40°C to +125°C 28-Lead TSSOP Package, Rail of 48
−40°C to +125°C 28-Lead TSSOP Package, Reel of 250
−40°C to +125°C 28-Lead TSSOP Package, Reel of 2500
−40°C to +125°C 28-Lead TSSOP Package, Rail of 48
−40°C to +125°C 28-Lead TSSOP Package, Reel of 250
−40°C to +125°C 28-Lead TSSOP Package, Reel of 2500
−40°C to +125°C 28-Lead TSSOP Package, Rail of 48
−40°C to +125°C 28-Lead TSSOP Package, Reel of 250
−40°C to +125°C 28-Lead TSSOP Package, Reel of 2500
−40°C to +125°C 28-Lead TSSOP Package, Rail of 48
−40°C to +125°C 28-Lead TSSOP Package, Reel of 250
−40°C to +125°C 28-Lead TSSOP Package, Reel of 2500
8.0 Connection Diagram
30169776
See Pin Descriptions for specific information regarding options LMP90079, LMP90078, and LMP90077.
5 www.national.com
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
TABLE 1. ENOB (Noise Free Resolution) vs. Sampling Rate and Gain at VA = VIO = VREF = 3V
ODR (SPS)
1
1.6775
16 (16)
3.355
16 (16)
6.71 16 (16)
13.42
16 (16)
26.83125 16 (16)
53.6625
16 (16)
107.325
16 (16)
214.65
16 (16)
2
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
4
16 (16)
16 (16)
16 (16)
16 (15.5)
16 (16)
16 (16)
16 (16)
16 (15.5)
Gain
8 16
16 (16)
16 (16)
16 (16)
16 (16)
16 (15.5) 16 (16)
16 (15)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (15.5) 16 (16)
16 (15)
16 (16)
32
16 (16)
16 (16)
16 (16)
16 (15.5)
16 (16)
16 (16)
16 (15.5)
16 (15)
64
16 (16)
16 (16)
16 (15)
16 (15)
16 (15.5)
16 (15)
16 (14.5)
16 (14.5)
128
16 (15.5)
16 (14.5)
16 (14.5)
16 (14)
16 (15)
16 (14.5)
16 (14)
16 (13.5)
TABLE 2. RMS Noise (µV) vs. Sampling Rate and Gain at VA = VIO = VREF = 3V
ODR (SPS)
1
1.6775
3.08
3.355
4.56
6.71 6.15
13.42
8.60
26.83125 3.35
53.6625
4.81
107.325
6.74
214.65
9.52
2
1.90
2.70
4.10
5.85
2.24
3.11
4.51
6.37
4
1.53
2.21
3.16
4.29
1.65
2.37
3.38
4.72
Gain of the ADC
8 16
1.27 0.23
1.67 0.34
2.39 0.51
3.64 0.67
1.33 0.33
1.90 0.44
2.66 0.63
3.79 0.90
32
0.21
0.27
0.40
0.54
0.27
0.39
0.54
0.79
64
0.15
0.24
0.37
0.51
0.26
0.37
0.52
0.72
128
0.14
0.26
0.35
0.49
0.25
0.36
0.49
0.70
TABLE 3. ENOB (Noise Free Resolution) vs. Sampling Rate and Gain at VA = VIO = VREF = 5V
SPS
1.6775
3.355
6.71
13.42
26.83125
53.6625
107.325
214.65
1
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
2
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
4
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
Gain of the ADC
8 16
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
32
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
16 (16)
64
16 (16)
16 (16)
16 (16)
16 (15.5)
16 (16)
16 (16)
16 (15.5)
16 (15)
128
16 (16)
16 (15.5)
16 (15)
16 (15)
16 (15.5)
16 (15)
16 (14.5)
16 (14)
SPS
1.6775
3.355
6.71
13.42
26.83125
53.6625
107.325
214.65
TABLE 4. RMS Noise (µV) vs. Sampling Rate and Gain at VA = VIO = VREF = 5V
1
2.68
3.86
5.23
7.94
2.90
4.11
5.74
8.25
2
1.65
2.36
3.49
5.01
1.86
2.60
3.72
5.31
4
1.24
1.78
2.47
3.74
1.34
1.90
2.72
3.82
Gain of the ADC
8 16
1.00 0.22
1.47 0.34
2.09 0.44
2.94 0.61
1.08 0.29
1.50 0.39
2.11 0.56
2.97 0.79
32
0.19
0.27
0.34
0.50
0.24
0.35
0.48
0.68
64
0.17
0.22
0.30
0.45
0.23
0.32
0.46
0.64
128
0.16
0.22
0.32
0.43
0.23
0.31
0.44
0.63
11
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LMP90080.PDF ] | |
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