SBOSAI9B December 2023 – March 2024 INA500
PRODMIX
Refer to the PDF data sheet for device specific package drawings
The INA500 is an integrated difference amplifier that processes large differential voltages while simultaneously rejecting larger common-mode voltages. The device offers a low power consumption of 13.5µA (typical) and has a smaller form factor.
With the specifications above, the device is a good fit for portable applications that are powered with single cell or coin-cell batteries. Often, these systems do not need sophisticated battery management technology but a solution that is rather simple and small-size. In a few other systems, battery monitoring ICs are preferred to perform sophisticated functions including cell balancing, protection, voltage and current sensing and so forth but these systems still need a secondary level of protection or redundancy with a simpler and reliable solution for system integrity. It is in these scenarios, the amplifier based battery monitoring application shown below could be quite useful.
Figure 8-2 shows an example circuit that monitors a 12V battery voltage and interfaces it to an ADC that is powered using a 3V power supply. The main advantage for using difference amplifiers in this application is the elimination of ground bounce, which is a common-mode signal, when measuring the battery voltage. These ground bounce signals, when not rejected, are capable of causing errors in the range of few milli-volts to tens or hundreds of milli-volts.