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APPLICATION INFORMATION

OPERATING VOLTAGE

IN-

Pre-OutputDriver

OUT

IN+

V-

V+

OPA211

OPA2211

SBOS377D – OCTOBER 2006 – REVISED FEBRUARY 2008

negative output voltage swing. With the OPA211

The OPA211 and OPA2211 are unity-gain stable,

series, power-supply voltages do not need to be

precision op amps with very low noise. Applications

equal. For example, the positive supply could be set

with noisy or high impedance power supplies require

to

+25V

with

the

negative

supply

at

–5V

or

decoupling capacitors close to the device pins. In

vice-versa.

most

cases,

0.1

µF capacitors are adequate.

Figure 38 shows a simplified schematic of the

The common-mode voltage must be maintained

OPA211. This die uses a SiGe bipolar process and

within

the

specified

range.

In

addition,

key

contains 180 transistors.

parameters

are

assured

over

the

specified

temperature

range,

=

–40

°C to +125°C.

Parameters that vary significantly with operating

voltage or temperature are shown in the Typical

OPA211 series op amps operate from ±2.25V to

Characteristics.

±18V

supplies

while

maintaining

excellent

performance. The OPA211 series can operate with as

little as +4.5V between the supplies and with up to

+36V

between

the

supplies.

However,

some

applications

do

not

require

equal

positive

and

Figure 38. OPA211 Simplified Schematic

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Product Folder Link(s): OPA211 OPA2211