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[FAQ] Selecting low cost amplifiers for battery testers

Other Parts Discussed in Thread: TLV9162, TLV9152

Battery test applications require voltage accuracy of 0.01% or 100 ppm of the full-scale range after system calibration. General-purpose amplifiers with 1µV/°C input offset drift can easily meet this requirement since 1µV/°C in ppm is 0.4ppm/°C drift for 2.5V full-scale range.  For 10°C ambient temperature change, the total uncalibrated error is only about 4ppm. This is very small compared to total error budget of 100ppm.

The TLV9162, TLV9152, and TLV9102 devices can support supply voltages of 16V with a typical offset voltage drift specification of <1µV/°C.  The OPA2992 is comparable to the TLV9162, but supports up to 40V, and the LM358B is a cost-optimized device with similar specs.

 Here is a comparison of the 2-channel variants of these devices. 1-ch and 4-ch variants are also available.

 

 *Note that prices are shown here just for comparison. Actual price of the devices could be different, and will depend on volume and time when it is ordered.

Since maximum offset drift is often important, this spec is often given as a distribution bar graph in the datasheet.  For example, here is the figure for offset drift in the TLV9152 datasheet:

If you would like to evaluate any of these devices, you can order samples from samples.ti.com or work with your local TI sales representative.