DocID024568 Rev 4

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TSX9291, TSX9292

Application information

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Application information

4.1

Operating voltages

The TSX929x series of operation amplifiers can operate from 4 V to 16 V. Parameters are

fully specified at 4.5 V, 10 V, and 16 V power supplies. However, parameters are very stable

temperature range of -40 to +125 °C.

4.2

Rail-to-rail input

The TSX9291 and TSX9292 are designed with two complementary PMOS and NMOS input

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

performances (see Figure 19). Performances are still suitable for a large number of

applications requiring the rail-to-rail input feature.

TSX9291 and TSX9292 are designed to prevent phase reversal.

4.3

Input pin voltage range

The TSX929x series has internal ESD diode protection on the inputs. These diodes are

connected between the input and each supply rail to protect MOSFETs inputs from

electrostatic discharges.

Thus, if the input pin voltage exceeds the power supply by 0.5 V, the ESD diodes become

conductive and excessive current could flow through them. To prevent any permanent

damage, this current must be limited to 10 mA. This can be done by adding a resistor, Rs, in

series with the input pin (Figure 35). The Rs resistor value has to be calculated for a 10 mA

current limitation on the input pins.

Figure 35. Limiting input current with a series resistor