TSX631 datasheet(18/31 Pages) STMICROELECTRONICS

18 / 31 page

Application information

TSX63x, TSX63xA

18/31

DocID024293 Rev 1

Application information

4.1

Operating voltages

The amplifiers of the TSX63x and TSX63xA series can operate from 3.3 to 16 V. Their

parameters are fully specified at 3.3, 5, 10 and 16 V power supplies. However, the

parameters are very stable in the full VCC range. Additionally, the main specifications are

guaranteed in extended temperature ranges from -40 ° C to +125 ° C.

4.2

Rail-to-rail input

The TSX63x and TSX63xA are built with two complementary PMOS and NMOS input

differential pairs. The devices have a rail-to-rail input, and the input common mode range is

extended from VCC-- 0.1 V to VCC+ + 0.1 V.

However, the performance of these devices is clearly optimized for the PMOS differential

pairs (which means from VCC- - 0.1V to VCC+ - 1.65V).

Beyond VCC+ - 1.65 V, the op-amp is still functional but with a degraded performance as can

be observed in the electrical characteristics section of this datasheet (mainly Vio).

These performances are suitable for a number of applications requiring rail-to-rail input and

output.

The devices are guaranteed without phase reversal.

4.3

Input offset voltage drift over temperature

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

variation related to 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

with T = -40 °C and 125 °C.

The datasheet maximum value is guaranteed by a measurement on a representative

sample size ensuring a Cpk (process capability index) greater than 2.

ΔVio

ΔT

------------

max

Vio T

() Vio 25° C

()

–

T25

° C

–

---------------------------------------------------

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