OPA320 datasheet(12/31 Pages) TI1

12 / 31 page

OPA320

V+

OUT

10mA,Max

OVERLOAD

-500

1000

Time( s)

-250

750

250

500

OUT

V = 2.5V

OPA320, OPA2320

OPA320S, OPA2320S

SBOS513D

– AUGUST 2010 – REVISED NOVEMBER 2011

www.ti.com

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

over the extended temperature range of

–40°C to

zero-crossover input topology eliminates the input

+125

°C. Parameters that can exhibit variance with

offset transition region typical of 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

voltages,

therefore

providing

further

in-system

current-limited to less than 10mA; therefore, a limiting

stability and predictability. Figure 30 shows the input

resistor is not required. Figure 29 shows how a series

voltage exceeding the supply voltage without any

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

phase reversal.

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 29. Input Current Protection

Figure 30. No Phase Reversal

Submit Documentation Feedback

Product Folder Link(s): OPA320 OPA2320 OPA320S OPA2320S

OPA320 Datasheet(PDF) 12 Page - Texas Instruments

OPA320 Datasheet(HTML) 12 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

Datasheet Download

Link URL