DocID026915 Rev 1

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AN4586

Precision op amps

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Precision op amps

Table 5 lists some precision op amps that might be used for differential to single-ended

measurements.

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Conclusion

In this application note, we looked at the three main architectures that allow us to perform

differential measurements by rejecting the Vicm. Each has its own pros and cons such as a

better CMRR, simpler architecture, high input impedance, or a smaller offset on the output

voltage.

This document highlights the importance of having very accurate resistors. For precise

differential measurements, a 1 % resistor may be not enough. We also saw that a high

precision op amp is useful for limiting the offset on the output voltage.

Table 5. Some precision op amps

Part number

Vio max (µV)

Vcc range (V)

GBP (Hz)

TSZ121

5

1.8 to 5.5

400 k

TSV731

200

1.5 to 5.5

900 k

TSX711

200

2.7 to 16

2.7 M

TS512A

500

6 to 30

3 M