OPA320SAIDBVT datasheet(17/58 Pages) TI2

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500

1000

Time( s)

250

750

250

500

OUT

V = 2.5V

OPA320

V+

OUT

10mA, Max

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OPA320, OPA2320, OPA320S, OPA2320S

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SBOS513F – AUGUST 2010 – REVISED DECEMBER 2016

Product Folder Links: OPA320 OPA2320 OPA320S OPA2320S

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Feature Description (continued)

7.3.2 Input and ESD Protection

The OPA320 incorporates internal electrostatic discharge (ESD) protection circuits on all pins. In the case of

input and output pins, this protection primarily consists of current-steering diodes connected between the input

and power-supply pins. These ESD protection diodes also provide in-circuit input overdrive protection, provided

that the current is limited to 10 mA as stated in the Absolute Maximum Ratings. Many input signals are inherently

current-limited to less than 10 mA; therefore, a limiting resistor is not required. Figure 33 shows how a series

input resistor (RS) may be added to the driven input to limit the input current. The added resistor contributes

thermal noise at the amplifier input and the value should be kept to the minimum in noise-sensitive applications.

Figure 33. Input Current Protection

7.3.3 Rail-to-Rail Input

The OPA320 product family features true rail-to-rail input operation, with supply voltages as low as ±0.9 V

(1.8 V). The design of the OPA320 amplifiers include an internal charge-pump that powers the amplifier input

stage with an internal supply rail at approximately 1.6 V above the external supply (VS+). This internal supply rail

allows the single differential input pair to operate and remain very linear over a very wide input common mode

range. A unique zero-crossover input topology eliminates the input offset transition region typical of many rail-to-

rail, complementary input stage operational amplifiers. This topology allows the OPA320 to provide superior

common-mode performance (CMRR > 110 dB, typical) over the entire common-mode input range, which extends

100 mV beyond both power-supply rails. When driving analog-to-digital converters (ADCs), the highly linear VCM

range of the OPA320 assures maximum linearity and lowest distortion.

7.3.4 Phase Reversal

The OPA320 op amps are designed to be immune to phase reversal when the input pins exceed the supply

voltages, therefore providing further in-system stability and predictability. Figure 34 shows the input voltage

exceeding the supply voltage without any phase reversal.

Figure 34. No Phase Reversal

OPA320SAIDBVT Datasheet(PDF) 17 Page - Texas Instruments

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