OPA375 datasheet(29/64 Pages) TI

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The OPAx375 family incorporates internal electrostatic discharge (ESD) protection circuits on all pins, as shown

above. These ESD protection diodes also provide in-circuit, input overdrive protection, as long as the current is

limited to 10 mA as stated in Section 7.1. Figure 8-3 shows how a series input resistor may be added to the

driven input to limit the input current. The added resistor contributes thermal noise at the amplifier input and its

value should be kept to a minimum in noise-sensitive applications.

5 kW

10-mA max

V+

OUT

OVERLOAD

Device

Figure 8-3. Input Current Protection

8.3.6 Typical Specifications and Distributions

Designers often have questions about a typical specification of an amplifier in order to design a more robust

circuit. Due to natural variation in process technology and manufacturing procedures, every specification of an

amplifier will exhibit some amount of deviation from the ideal value, like an amplifier's input offset voltage. These

deviations often follow Gaussian ("bell curve"), or normal, distributions and circuit designers can leverage this

information to guardband their system, even when there is not a minimum or maximum specification in Section

7.6.

0.00002%

-1

-21

-31

-41

-51

-61

+21

+31

+41

+51

+61

34.13% 13.59%

34.13%

13.59%

2.145%

2.145% 0.13185%

0.13185%

0.00312%

Figure 8-4. Ideal Gaussian Distribution

Figure 8-4 shows an example distribution, where µ, or mu, is the mean of the distribution, and where σ,

or sigma, is the standard deviation of a system. For a specification that exhibits this kind of distribution,

approximately two-thirds (68.26%) of all units can be expected to have a value within one standard deviation, or

one sigma, of the mean (from µ–σ to µ+σ).

Depending on the specification, values listed in the typical column of Section 7.6 are represented in different

ways. As a general rule of thumb, if a specification naturally has a nonzero mean (for example, like gain

bandwidth), then the typical value is equal to the mean (µ). However, if a specification naturally has a mean near

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OPA375, OPA2375

SBOS886E – NOVEMBER 2017 – REVISED AUGUST 2021

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