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INA239 Datasheet(PDF) 30 Page - Texas Instruments

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Part # INA239
Description  INA239 85-V, 16-Bit, High-Precision Power Monitor With SPI Interface
PDF  44 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

INA239 Datasheet(HTML) 30 Page - Texas Instruments

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Table 8-2. INA239 Noise Performance (continued)
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
256
12.8
15.7
13.7
84
21.504
15.7
14.7
150
38.4
15.7
15.7
280
71.68
16.0
15.7
540
138.24
16.0
15.7
1052
269.312
16.0
16.0
2074
530.944
16.0
16.0
4120
1054.72
16.0
16.0
50
512
25.6
15.7
14.1
84
43
16.0
15.7
150
76.8
16.0
15.7
280
143.36
16.0
15.7
540
276.48
16.0
15.7
1052
538.624
16.0
16.0
2074
1061.888
16.0
16.0
4120
2109.44
16.0
16.0
50
1024
51.2
15.7
14.7
84
86.016
15.7
15.7
150
153.6
16.0
16.0
280
286.72
16.0
16.0
540
552.96
16.0
16.0
1052
1077.248
16.0
16.0
2074
2123.776
16.0
16.0
4120
4218.88
16.0
16.0
8.1.4 Input Filtering Considerations
As previously discussed, INA239 offers several options for noise filtering by allowing the user to select the
conversion times and number of averages independently in the ADC_CONFIG register. The conversion times
can be set independently for the shunt voltage and bus voltage measurements to allow added flexibility in
monitoring of the power-supply bus.
The internal ADC has good inherent noise rejection; however, the transients that occur at or very close to the
sampling rate harmonics can cause problems. Because these signals are at 1 MHz and higher, they can be
managed by incorporating filtering at the input of the device. Filtering high frequency signals enables the use of
low-value series resistors on the filter with negligible effects on measurement accuracy. For best results, filter
using the lowest possible series resistance (typically 100 Ω or less) and a ceramic capacitor. Recommended
values for this capacitor are between 0.1 µF and 1 µF. Figure 8-1 shows the device with a filter added at the
input.
Overload conditions are another consideration for the device inputs. The device inputs are specified to tolerate
±40 V differential across the IN+ and IN– pins. A large differential scenario might be a short to ground on the
load side of the shunt. This type of event can result in full power-supply voltage across the shunt (as long the
power supply or energy storage capacitors support it). Removing a short to ground can result in inductive
kickbacks that could exceed the 40-V differential or 85-V common-mode absolute maximum rating of the device.
Inductive kickback voltages are best controlled by Zener-type transient-absorbing devices (commonly called
transzorbs) combined with sufficient energy storage capacitance. See the Transient Robustness for Current
Shunt Monitors reference design which describes a high-side current shunt monitor used to measure the voltage
developed across a current-sensing resistor when current passes through it.
INA239
SLYS027 – JANUARY 2021
www.ti.com
30
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Product Folder Links: INA239



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