R

S

OPA322

V+

V

IN

V

OUT

I

10mA,Max

OVERLOAD

4

3

2

1

0

1

2

3

4

-

-

-

-

-500

1000

Time( s)

m

-250

0

750

250

500

V

OUT

V

IN

V = 2.5V

±

S

OPA322, OPA322S

OPA2322, OPA2322S

OPA4322, OPA4322S

SBOS538C

– JANUARY 2011 – REVISED NOVEMBER 2011

www.ti.com

APPLICATION INFORMATION

OPERATING VOLTAGE

The OPA322 series op amps are unity-gain stable and can operate on a single-supply voltage (1.8 V to 5.5 V), or

a split-supply voltage (

±0.9 V to ±2.75 V), making them highly versatile and easy to use. The power-supply pins

should have local bypass ceramic capacitors (typically 0.001

μF to 0.1 μF). These amplifiers are fully specified

from +1.8 V to +5.5 V and over the extended temperature range of

–40°C to +125°C. Parameters that can exhibit

variance with regard to operating voltage or temperature are presented in the Typical Characteristics.

INPUT AND ESD PROTECTION

The OPA322 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, as long as

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

inherently current-limited to less than 10 mA; therefore, a limiting resistor is not required. Figure 26 shows how a

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

applications.

Figure 26. Input Current Protection

PHASE REVERSAL

The OPA322 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 27 shows the input voltage

exceeding the supply voltage without any phase reversal.

Figure 27. No Phase Reversal

12

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© 2011, Texas Instruments Incorporated

Product Folder Link(s): OPA322 OPA322S OPA2322 OPA2322S OPA4322 OPA4322S