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INA3221-Q1 Datasheet(PDF) 17 Page - Texas Instruments |
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INA3221-Q1 Datasheet(HTML) 17 Page - Texas Instruments |
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17 / 45 page  í120 í80 í40 0 40 80 120 0 Conversion Time: 140 µs Conversion Time: 332 µs Conversion Time: 1.1 ms 200 400 600 800 1000 Number of Conversions 17 INA3221-Q1 www.ti.com SBOS776B – MARCH 2016 – REVISED MARCH 2016 Product Folder Links: INA3221-Q1 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Device Functional Modes (continued) 8.4.2.2 Averaging and Conversion-Time Considerations The INA3221-Q1 has programmable conversion times for both the shunt- and bus-voltage measurements. The selectable conversion times for these measurements range from 140 μs to 8.244 ms. The conversion-time settings, along with the programmable-averaging mode, enable the INA3221-Q1 to optimize available timing requirements in a given application. For example, if a system requires data to be read every 2 ms with all three channels monitored, configure the INA3221-Q1 with the conversion times for the shunt- and bus-voltage measurements set to 332 μs. The INA3221-Q1 can also be configured with a different conversion-time setting for the shunt- and bus-voltage measurements. This approach is common in applications where the bus voltage tends to be relatively stable, and allows for the time focused on the bus voltage measurement to be reduced relative to the shunt-voltage measurement. For example, the shunt-voltage conversion time can be set to 4.156 ms with the bus-voltage conversion time set to 588 μs for a 5-ms update time. There are trade-offs associated with the conversion-time and averaging-mode settings. The averaging feature significantly improves the measurement accuracy by effectively filtering the signal. This approach allows the INA3221-Q1 to reduce the amount of noise in the measurement caused by noise coupling into the signal. A greater number of averages allows the INA3221-Q1 to be more effective in reducing the measurement noise component. The trade-off to this noise reduction is that the averaged value has a longer response time to input- signal changes. This aspect of the averaging feature is mitigated to some extent with the critical-alert feature that compares each single conversion to determine if a measured signal (with noise component) has exceeded the maximum acceptable level. The selected conversion times also have an impact on measurement accuracy. This effect can seen in Figure 25. The multiple conversion times shown in Figure 25 illustrate the impact of noise on measurement. These curves shown do not use averaging. In order to achieve the highest-accuracy measurement possible, use a combination of the longest allowable conversion times and highest number of averages, based on system timing requirements. Figure 25. Noise Versus Conversion Time |
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