TSX920 datasheet(17/32 Pages) STMICROELECTRONICS

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TSX920, TSX921, TSX922, TSX923

Application information

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Application information

5.1

Operating voltages

The TSX92x operational amplifiers can operate from 4 V to 16 V. The parameters are fully

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

the full VCC range. Additionally, main specifications are guaranteed in the extended

temperature range from -40 to 125 °C.

5.2

Rail-to-rail input

The TSX92x series is designed with two complementary PMOS and NMOS input

differential pairs. The device has 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 this device is

clearly optimized for the PMOS differential pairs (which means from (VCC-) - 0.1 V to

(VCC+) - 2 V).

Beyond (VCC+) - 2 V, the operational amplifier is still functional but with downgraded

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

applications requiring the rail-to-rail input feature.

The TSX92x operational amplifiers are designed to prevent phase reversal.

5.3

Input pin voltage range

The TSX92x operational amplifiers have internal ESD diode protections 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 in

series with the input pin (Figure 38: "Limiting input current with a series resistor"). The

resistor value has to be calculated for a 10 mA current limitation on the input pins.

Figure 38: Limiting input current with a series resistor

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