OA1ZHA datasheet(19/35 Pages) STMICROELECTRONICS

19 / 35 page

OA1ZHA, OA2ZHA, OA4ZHA

Application information

DocID025994 Rev 2

19/35

5.2

Operating voltages

OA1ZHA, OA2ZHA and OA4ZHA CMOS op amp can operate from 1.8 to 5.5 V. The

parameters are fully specified for 1.8 V, 3.3 V, and 5 V power supplies. However, the

parameters are very stable in the full ςΧΧ range and several characterization curves show

the OA1ZHA, OA2ZHA and OA4ZHA op amp characteristics at 1.8 V and 5.5 V.

Additionally, the main specifications are guaranteed in extended temperature ranges from

-40 to 125 ° C.

5.3

Input pin voltage ranges

OA1ZHA, OA2ZHA and OA4ZHA CMOS op amp can operate from 1.8 to 5.5 V. The

parameters are fully specified for 1.8 V, 3.3 V, and have internal ESD diode protection on

the inputs. These diodes are connected between the input and each supply rail to protect

the input MOSFETs from electrical discharge.

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

conductive and excessive current can flow through them. Without limitation this over

current can damage the device.

In this case, it is important to limit the current to 10 mA, by adding resistance on the input

pin, as described in Figure 42: "Input current limitation".

Figure 42: Input current limitation

5.4

Rail-to-rail input

OA1ZHA, OA2ZHA and OA4ZHA CMOS op amp have a rail-to-rail input, and the input

common mode range is extended from (VCC-) - 0.1 V to (VCC+) + 0.1 V.

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