INA745AIRELR datasheet(18/50 Pages) TI2

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6.3.5.2 Flexible Conversion Times and Averaging

ADC conversion times for bus voltage can be set independently from 50μs to 4.12ms. The total conversion time

for current includes an additional conversion time for temperature, and can be varied from 100μs to 8.24ms. 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 7-4 provides additional details on the supported conversion times and averaging modes. The

INA745x effective resolution of the ADC can be increased by increasing the conversion time and increasing

the number of averages. Figure 6-9 and Figure 6-10 shown below illustrate the effect of conversion time and

averaging on a constant input signal.

Number of Conversions

2000

4000

6000

8000

10000

Conversion Time: 50µs

Conversion Time: 1.052ms

Conversion Time: 4.120ms

Figure 6-9. Noise vs Conversion Time (Averaging = 1)

Number of Conversions

2000

4000

6000

8000

10000

Conversion Time: 50µs

Conversion Time: 1.052ms

Conversion Time: 4.120ms

Figure 6-10. Noise vs Conversion Time (Averaging = 128)

Settings for the conversion time and number of conversions averaged impact the effective measurement

resolution. For more detailed information on how averaging reduces noise and increases the effective number of

bits (ENOB) see ADC Output Data Rate and Noise Performance.

6.3.6 Integrated Precision Oscillator

The internal timebase of the device is provided by an internal oscillator that is trimmed to less than 0.5%

tolerance at room temperature. The precision oscillator is the timing source for ADC conversions, as well as

the time-count used for calculation of energy and charge. The digital filter response varies with conversion time;

therefore the precise clock verifies that the filter response and notch frequency consistency across temperature.

On power up, the internal oscillator and ADC take roughly 300µs to reach <1% error stability. After the clock

stabilizes, the ADC data output is accurate to the electrical specifications provided in Specifications.

INA745A, INA745B

SBOSAC3B – JULY 2023 – REVISED AUGUST 2025

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