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PDF LMP90098 Data sheet ( Hoja de datos )
| Número de pieza | LMP90098 | |
| Descripción | (LMP90097 - LMP90100) Sensor AFE System | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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LMP90100/LMP90099/
LMP90098/LMP90097
July 25, 2011
Sensor AFE System: Multi-Channel, Low Power 24-Bit
Sensor AFE with True Continuous Background Calibration
1.0 General Description
The LMP90100/LMP90099/LMP90098/LMP90097 are highly
integrated, multi-channel, 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 fea-
ture essentially eliminates gain and offset errors across tem-
perature and time, providing measurement accuracy without
sacrificing speed and power consumption.
Another feature of the LMP90100/LMP90099/LMP90098/
LMP90097 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
LMP90100/LMP90098 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 LMP90100/LMP90099/
LMP90098/LMP90097 complete analog front-ends for low
power, precision sensor applications such as temperature,
pressure, strain gauge, and industrial process control. The
LMP90100/LMP90099/LMP90098/LMP90097 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
■ 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 - 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
3.0 Key Specifications
■ ENOB/NFR
Up to 21.5/19 bits
■ Offset Error (typ)
8.4 nV
■ Gain Error (typ)
7 ppm
■ Total Noise
< 10 µV-rms
■ Integral Non-Linearity (INL max)
±15 ppm of FSR
■ 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 301395
30139574
www.national.com
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
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7.0 Ordering Information
Product
LMP90100
LMP90099
LMP90098
LMP90097
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
LMP90100MH/NOPB
LMP90100MHE/NOPB
LMP90100MHX/NOPB
LMP90099MH/NOPB
LMP90099MHE/NOPB
LMP90099MHX/NOPB
LMP90098MH/NOPB
LMP90098MHE/NOPB
LMP90098MHX/NOPB
LMP90097MH/NOPB
LMP90097MHE/NOPB
LMP90097MHX/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
30139576
See Pin Descriptions for specific information regarding options LMP90099, LMP90098, and LMP90097.
5 www.national.com
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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
20.5 (18)
3.355
20 (17.5)
6.71 19.5 (17)
13.42
19 (16.5)
26.83125 20.5 (18)
53.6625
20 (17.5)
107.325
19.5 (17)
214.65
19 (16.5)
2
20.5 (18)
20 (17.5)
19.5 (17)
18.5 (16)
20 (17.5)
19.5 (17)
19 (16.5)
18.5 (16)
4
19.5 (17)
19 (16.5)
18.5 (16)
18 (15.5)
19.5 (17)
19 (16.5)
18.5 (16)
18 (15.5)
Gain
8 16
19 (16.5) 20.5 (18)
18.5 (16) 20 (17.5)
18 (15.5) 19.5 (17)
17.5 (15) 19 (16.5)
19 (16.5) 20 (17.5)
18.5 (16) 19.5 (17)
18 (15.5) 19 (16.5)
17.5 (15) 18.5 (16)
32
19.5 (17)
19 (16.5)
18.5 (16)
18 (15.5)
19 (16.5)
18.5 (16)
18 (15.5)
17.5 (15)
64
19 (16.5)
18.5 (16)
17.5 (15)
17.5 (15)
18 (15.5)
17.5 (15)
17 (14.5)
17 (14.5)
128
18 (15.5)
17 (14.5)
17 (14.5)
16.5 (14)
17.5 (15)
17 (14.5)
16.5 (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
21.5 (19)
21 (18.5)
20.5 (18)
20 (17.5)
21.5 (19)
21 (18.5)
20.5 (18)
20 (17.5)
2
21.5 (19)
21 (18.5)
20 (17.5)
19.5 (17)
21 (18.5)
20.5 (18)
20 (17.5)
19.5 (17)
4
20.5 (18)
20 (17.5)
19.5 (17)
19 (16.5)
20.5 (18)
20 (17.5)
19.5 (17)
19 (16.5)
Gain of the ADC
8 16
20 (17.5) 21 (18.5)
19.5 (17) 20.5 (18)
19 (16.5) 20 (17.5)
18.5 (16) 20 (17.5)
20 (17.5) 21 (18.5)
19.5 (17) 20.5 (18)
19 (16.5) 20 (17.5)
18.5 (16) 19.5 (17)
32
20.5 (18)
20 (17.5)
19.5 (17)
19 (16.5)
20 (17.5)
19.5 (17)
19 (16.5)
18.5 (16)
64
19.5 (17)
19 (16.5)
19 (16.5)
18 (15.5)
19.5 (17)
18.5 (16)
18 (15.5)
17.5 (15)
128
18.5 (16)
18 (15.5)
17.5 (15)
17.5 (15)
18 (15.5)
17.5 (15)
17 (14.5)
16.5 (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 62 Páginas | |
| PDF Descargar | [ Datasheet LMP90098.PDF ] | |
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