INA228 datasheet(15/50 Pages) TI

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defined as fNOTCH= 1 / (2 x TCT). This means that the filter cut-off frequency will scale proportionally with the data

output rate as described. ADC Frequency Response shows the filter response when the 1.052 ms conversion

time period is selected.

−60

−50

−40

−30

−20

−10

100

10k

100k

Frequency (Hz)

G001

Conversion time = 1.052 ms, single

conversion only

Figure 7-3. ADC Frequency Response

7.3.4.2 Flexible Conversion Times and Averaging

ADC conversion times for shunt voltage, bus voltage and temperature can be set independently from 50 μs to

4.12 ms. The flexibility in conversion time allows for robust operation in a variety of noisy environments. The

device also allows for programmable averaging times from a single conversion all the way to an average of

1024 conversions. The amount of averaging selected applies uniformly to all active measurement inputs. The

ADC_CONFIG register shown in Table 7-6 provides additional details on the supported conversion times and

averaging modes. The INA228-Q1 effective resolution of the ADC can be increased by increasing the conversion

time and increasing the number of averages. Figure 7-4 and Figure 7-5 shown below illustrate the effect of

conversion time and averaging on a constant input signal.

Figure 7-4. Noise vs Conversion Time (Averaging = 1)

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INA228-Q1

SLYS022A – JUNE 2020 – REVISED JUNE 2021

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INA228 Datasheet(PDF) 15 Page - Texas Instruments