INA700 datasheet(17/50 Pages) TI

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7.3.5.1 Low Latency Digital Filter

The device integrates a low-pass digital filter that performs both decimation and filtering on the ADC output data,

which helps with noise reduction. The digital filter is automatically adjusted for the different output data rates

and always settles within one conversion cycle. The user has the flexibility to choose different output conversion

time periods TCT from 50 µs to 4.12 ms. With this configuration the first amplitude notch appears at the Nyquist

frequency of the output signal that is determined by the selected conversion time period (see Equation 1).

fNOTCH= 12×TCT

(1)

This means that the filter cut-off frequency will scale proportionally with the data output rate as described. Figure

7-7 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 7-7. ADC Frequency Response

7.3.5.2 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 shows additional details on the supported conversion times and

averaging modes. The INA700 effective resolution of the ADC can be increased by increasing the conversion

time and increasing the number of averages. Figure 7-8 and Figure 7-9 both show the effect of conversion time

and averaging on a constant input signal.

Number of Conversions

2000

4000

6000

8000

10000

Conversion Time: 50 µs

Conversion Time: 1.052 ms

Conversion Time: 4.120 ms

Figure 7-8. Noise vs Conversion Time (Averaging = 1)

www.ti.com

INA700

SBOSAB4A – MAY 2023 – REVISED SEPTEMBER 2023

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