OPA320 datasheet(13/37 Pages) NSC

13 / 37 page

500

1000

Time( s)

250

750

250

500

OUT

V = 2.5V

OPA320

V+

OUT

10mA,Max

OVERLOAD

OPA320, OPA2320

OPA320S, OPA2320S

www.ti.com

SBOS513E – AUGUST 2010 – REVISED JUNE 2013

APPLICATION INFORMATION

RAIL-TO-RAIL INPUT

OPERATING VOLTAGE

The OPA320 product family features true rail-to-rail

input operation, with supply voltages as low as ±0.9V

The OPA320 series op amps are unity-gain stable

(1.8V). The design of the OPA320 amplifiers include

and can operate on a single-supply voltage (1.8V to

an internal charge-pump that powers the amplifier

5.5V), or a split supply voltage (±0.9V to ±2.75V),

input

stage

with

internal

supply

rail

making them highly versatile and easy to use. The

approximately 1.6V above the external supply (VS+).

power-supply pins should have local bypass ceramic

This internal supply rail allows the single differential

capacitors (typically 0.001

μF to 0.1μF). The OPA320

input pair to operate and remain very linear over a

amplifiers are fully specified from +1.8V to +5.5V and

very wide input common-mode range. A unique zero-

over the extended temperature range of –40°C to

crossover input topology eliminates the input offset

+125°C. Parameters that can exhibit variance with

transition

region

typical

many

rail-to-rail,

regard to operating voltage or temperature are

complementary input stage operational amplifiers.

presented in the Typical Characteristics.

This topology allows the OPA320 to provide superior

common-mode

performance

(CMRR

110dB,

INPUT AND ESD PROTECTION

typical) over the entire common-mode input range,

The

OPA320

incorporates

internal

electrostatic

which extends 100mV beyond both power-supply

discharge (ESD) protection circuits on all pins. In the

rails.

When

driving

analog-to-digital

converters

case of input and output pins, this protection primarily

(ADCs), the highly linear VCM range of the OPA320

consists

current-steering

diodes

connected

assures maximum linearity and lowest distortion.

between the input and power-supply pins. These ESD

protection

diodes

also

provide

in-circuit

input

PHASE REVERSAL

overdrive protection, provided that the current is

The OPA320 op amps are designed to be immune to

limited to 10mA as stated in the Absolute Maximum

phase reversal when the input pins exceed the supply

Ratings. Many input signals are inherently current-

voltages,

therefore

providing

further

in-system

limited to less than 10mA; therefore, a limiting resistor

stability and predictability. Figure 34 shows the input

is not required. Figure 33 shows how a series input

voltage exceeding the supply voltage without any

resistor (RS) may be added to the driven input to limit

phase reversal.

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

Figure 34. No Phase Reversal

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