IOVERLOAD

10 mA max

5

NŸ

VIN

VOUT

+5 V

Current-limiting resistor

required if input voltage

exceeds supply rails by

> 0.3 V.

13

OPA1671

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SBOS931B – JANUARY 2019 – REVISED AUGUST 2019

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7.3 Feature Description

7.3.1 Operating Voltage

The OPA1671 op amp can be used with single or dual supplies from an operating range of VS = 1.7 V (±0.85 V)

up to 5.5 V (±2.75 V).

CAUTION

Supply voltages greater than 6 V can permanently damage the device (see Absolute

Maximum Ratings)

Key parameters that vary over the supply voltage or temperature range are shown in the Typical Characteristics

section.

7.3.2 Input Bias Current

Typically, input bias current is approximately ±10 pA. Input voltages exceeding the power supplies, however, can

cause excessive current to flow into or out of the input pins. Momentary voltages greater than the power supply

can be tolerated if the input current is limited to 10 mA. This limitation is easily accomplished with an input

resistor, as shown in Figure 30.

Unlike many operational amplifiers, there are no diodes connected between the positive and negative input

terminals. As a result, differential voltages up to the full supply voltage do not cause any significantly higher

current flow into the inputs.

Figure 30. Input Current Protection

7.3.3 Common-Mode Voltage Range

The OPA1671 features true rail-to-rail inputs, allowing full common mode operation from the negative supply

voltage to the positive supply voltage. This full common mode operation is achieved with complimentary N-

channel and P-channel differential input pairs. The N-channel pair is active for input voltages close to the positive

rail, typically (V+) – 1.25 V to (V+) The P-channel is active for common-mode inputs from (V–) to (V+) – 1.25 V.

There is a small transition region, typically from (V+) – 1.25 V to (V+) – 1 V. In this region, the offset voltage

transitions between the P-channel and N-channel offset values. Figure 5 shows the difference between offset in

the P and N regions.