Figure 27. Phase reversal test schematic

VCC+

VCC-

Vout

Vinp

5 V

2.5 V

AM00483

+

_

Figure 28. No phase reversal

-2.0

-2.0

-1.0

0.0

0.0

1.0

2.0

2.0

3.0

4.0

4.0

5.0

6.0

6.0

-1

0

1

2

3

4

5

6

VCC = 5.5 V

Vinn = 2.75 V

Vinp (V)

AM00484

5.4

Rail-to-rail output

The operational amplifier output levels can go close to the rails: 35 mV maximum above and below the rail when

connected to a 10 kΩ resistive load to VCC/2.

5.5

Driving resistive and capacitive loads

To drive high capacitive loads, adding an in-series resistor at the output can improve the stability of the device

(see Figure 29 for the recommended in series value). Once the in-series resistor has been selected, the stability

of the circuit should be tested on the bench and simulated with simulation models. The Rload is placed in parallel

with the capacitive load. The Rload and the in-series resistor create a voltage divider which introduces an error

proportional to the ratio Rs/Rload. By keeping Rs as low as possible, this error is generally negligible.

Figure 29. In-series resistor versus capacitive load

0.1

1.0

10.0

100.0

1

10

100

Stable

Minimum serial resistor to be added to a given

capacitive load in order to ensure stability

VCC = 5 V, Vicm = 2.5 V, T = 25 °C, R load

Unstable

Capacitive load (nF)

AM00485

5.6

Input offset voltage drift over the 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.

TSV521, TSV522, TSV524,TSV521A, TSV522A, TSV524A

Application information

DS8862 - Rev 4

page 14/29