OA4ZHA datasheet(20/35 Pages) STMICROELECTRONICS

20 / 35 page

Application information

OA1ZHA, OA2ZHA, OA4ZHA

20/35

DocID025994 Rev 2

5.5

Input offset voltage drift over temperature

The maximum input voltage drift variation over temperature is defined as the offset

variation related to the offset value measured at 25 °C. The operational amplifier is one of

the main circuits of the signal conditioning chain, and the amplifier input offset is a major

contributor to the chain accuracy. The signal chain accuracy at 25 °C can be compensated

during production at application level. The maximum input voltage drift over temperature

enables the system designer to anticipate the effect of temperature variations.

The maximum input voltage drift over temperature is computed using Equation 1.

Equation 1

where T = -40 °C and 125 °C.

The OA1ZHA, OA2ZHA and OA4ZHA CMOS datasheet maximum value is guaranteed by

measurements on a representative sample size ensuring a Cpk (process capability index)

greater than 1.3.

5.6

Rail-to-rail output

The operational amplifier output levels can go close to the rails: to a maximum of 30 mV

above and below the rail when connected to a 10

kΩ resistive load to VCC/2.

∆V

∆T

ma x

io T

io 25

–

25 °C

–

°C

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