OPA378 datasheet(10/31 Pages) TI2

10 / 31 page

3.0

(V)

2.0

2.5

1.5 -1.0 -0.5

2.0

0.5 1.0 1.5

2.5 3.0

V = 2.75V

10TypicalUnitsShown

5kW

OPA378

10mAmax

+5V

OUT

OVERLOAD

Current-limitingresistor

requiredifinputvoltage

exceedssupplyrailsby

0.5V.

OPA378

OPA2378

SBOS417D – JANUARY 2008 – REVISED OCTOBER 2009

www.ti.com

APPLICATIONS INFORMATION

The OPA378 and OPA2378 are unity-gain stable,

precision operational amplifiers that are free from

phase reversal. The use of proprietary Zerø-Drift

circuitry gives the benefit of low input offset voltage

over time and temperature as well as lowering the 1/f

noise

component.

This

design

provides

the

optimization of gain, noise, and power, making the

OPA378 series one of the best performers in this

bandwidth range. As a result of the high PSRR, this

device works well in applications that run directly from

battery power without regulation. They are optimized

for

low-voltage,

single-supply

operation.

These

miniature,

high-precision,

low

quiescent

current

amplifiers offer high-impedance inputs that have a

common-mode range 100mV beyond the supplies,

excellent CMRR, and a rail-to-rail output that swings

within 10mV of the supplies. This design results in

Figure 26. Offset Voltage versus Common-Mode

superior performance for driving analog-to-digital

Voltage

converters (ADCs) without degradation of differential

linearity.

Normally, input bias current is about 150pA; however,

input voltages exceeding the power supplies can

OPERATING VOLTAGE

cause excessive current to flow into or out of the

input pins. Momentary voltages greater than the

The OPA378 and OPA2378 can be used with single

power supply can be tolerated if the input current is

or dual supplies from an operating range of VS =

limited to 10mA. This limitation is easily accomplished

+2.2V (±1.1V) and up to VS = +5.5V (±2.75V). This

with an input resistor, as Figure 27 shows.

device does not require symmetrical supplies, only a

differential

supply

voltage

2.2V

5.5V.

power-supply rejection ratio of 1.5

μV/V (typical)

ensures that the device functions with an unregulated

battery source. Supply voltages higher than +7V can

permanently damage the device; see the Absolute

Maximum Ratings table. Key parameters are assured

over the specified temperature range, TA = –40°C to

+125°C. Parameters that vary over the supply voltage

or temperature range are shown in the Typical

Characteristics section of this data sheet.

INPUT VOLTAGE

Figure 27. Input Current Protection

The OPA378 and OPA2378 input common-mode

voltage range extends 0.05V beyond the supply rails.

The OPA378 achieves a common-mode rejection

ratio of 112dB (typical) over the common-mode

voltage range. Figure 26 shows the variation of offset

voltage over the entire specified common-mode

range for 10 typical units.

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