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INA229 Datasheet(PDF) 31 Page - Texas Instruments

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Part # INA229
Description  INA229 85-V, 20-Bit, Ultra-Precise Power/Energy/Charge Monitor With SPI Interface
PDF  40 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

INA229 Datasheet(HTML) 31 Page - Texas Instruments

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ADC conversion time and data averaging offers increased signal-to-noise ratio and achieves the highest
dynamic range with lowest offset. The profile of the noise at lower signals levels is dominated by the system
noise that is comprised mainly of 1/f noise or white noise. The INA229 effective resolution of the ADC can be
increased by increasing the conversion time and increasing the number of averages.
Table 8-2 summarizes the output data rate conversion settings supported by the device. The fastest conversion
setting is 50 µs. Typical noise-free resolution is represented as Effective Number of Bits (ENOB) based on
device measured data. The ENOB is calculated based on noise peak-to-peak values, which assures that full
noise distribution is taken into consideration.
Table 8-2. INA229 Noise Performance
ADC CONVERSION
TIME PERIOD [µs]
OUTPUT SAMPLE
AVERAGING [SAMPLES]
OUTPUT SAMPLE PERIOD
[ms]
NOISE-FREE ENOB
(±163.84-mV)
(ADCRANGE = 0)
NOISE-FREE ENOB
(±40.96-mV)
(ADCRANGE = 1)
50
1
0.05
12.4
10.4
84
0.084
12.6
10.4
150
0.15
13.3
11.4
280
0.28
13.8
11.8
540
0.54
14.2
12.4
1052
1.052
14.5
12.6
2074
2.074
15.3
13.3
4120
4.12
16.0
13.8
50
4
0.2
13.1
11.4
84
0.336
13.9
11.8
150
0.6
14.3
12.2
280
1.12
14.9
12.8
540
2.16
15.1
13.0
1052
4.208
15.8
13.8
2074
8.296
16.1
14.3
4120
16.48
16.5
14.4
50
16
0.8
13.9
12.3
84
1.344
14.7
12.9
150
2.4
15.1
13.0
280
4.48
15.8
13.7
540
8.64
16.3
14.3
1052
16.832
16.5
14.6
2074
33.184
17.1
15.3
4120
65.92
17.7
15.9
50
64
3.2
15.0
13.3
84
5.376
15.9
13.8
150
9.6
16.4
14.4
280
17.92
16.9
14.5
540
34.56
17.7
15.3
1052
67.328
17.7
15.9
2074
132.736
18.1
16.3
4120
263.68
18.7
16.5
www.ti.com
INA229
SLYS023 – DECEMBER 2020
Copyright © 2020 Texas Instruments Incorporated
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