Precision Micropower, OVP, RRIO

Operational Amplifier

ADA4091-2/ADA4091-4

Rev. E

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FEATURES

Single-supply operation: 2.7 V to 36 V

Wide input voltage range

Rail-to-rail output swing

Low supply current: 200 µA/amplifier

Wide bandwidth: 1.2 MHz

Slew rate: 0.46 V/µs

Low offset voltage: 250 µV maximum

No phase reversal

Overvoltage protection (OVP)

25 V above/below supply rails at ±5 V

12 V above/below supply rails at ±15 V

APPLICATIONS

Industrial process control

Battery-powered instrumentation

Power supply control and protection

Telecommunications

Remote sensors

Low voltage strain gage amplifiers

DAC output amplifiers

GENERAL DESCRIPTION

The ADA4091-2 dual and ADA4091-4 quad are micropower,

single-supply, 1.2 MHz bandwidth amplifiers featuring rail-to-

rail inputs and outputs. They are guaranteed to operate from a

+2.7 V to +30 V single supply as well as from ±1.35 V to ±15 V

dual supplies.

The ADA4091 family features a unique input stage that allows

the input voltage to exceed either supply safely without any phase

reversal or latch-up; this is called overvoltage protection, or OVP.

Applications for these amplifiers include portable telecom-

munications equipment, power supply control and protection,

and interface for transducers with wide output ranges. Sensors

requiring a rail-to-rail input amplifier include Hall effect, piezo-

electric, and resistive transducers.

The ability to swing rail-to-rail at both the input and output enables

designers, for example, to build multistage filters in single-supply

systems and to maintain high signal-to-noise ratios (SNR).

The ADA4091 family is specified over the extended industrial

temperature range of −40°C to +125°C. The ADA4091 family is

part of the growing selection of 36 V, low power op amps from

Analog Devices, Inc., (see Table 1).

PIN CONFIGURATIONS

OUTA

1

–INA

2

+INA

3

–V

4

+V

8

OUTB

7

–INB

6

+INB

5

ADA4091-2

TOP VIEW

(Not to Scale)

Figure 1. 8-Lead, Narrow-Body SOIC (R-8)

1

OUTA

2

–INA

3

+INA

4

–V

7 OUTB

8 +V

6 –INB

5 +INB

TOP VIEW

ADA4091-2

(Not to Scale)

NOTES

EXPOSED PAD TO V–.

Figure 2. 8-Lead LFCSP (CP-8-9)

ADA4091-4

1

2

3

4

5

6

7

–INA

+INA

+V

OUTB

–INB

+INB

OUTA

14

13

12

11

10

9

8

–IND

+IND

–V

OUTC

–INC

+INC

OUTD

TOP VIEW

(Not to Scale)

Figure 3. 14-Lead TSSOP (RU-14)

12

11

10

1

3

4

–IND

+IND

V–

9

+INC

–INA

V+

2

+INA

+INB

TOP

VIEW

ADA4091-4

NOTES

1. NC = NO CONNECT.

2. IT IS RECOMMENDED TO CONNECT THE

EXPOSED PAD TO V–.

Figure 4. 16-Lead LFCSP (CP-16-17)

The ADA4091-2 is available in 8-lead, plastic SOIC and 8-lead

LFCSP packages. The ADA4091-4 is available in 14–lead TSSOP

and 16-lead LFCSP surface-mount packages.

Table 1. Low Power, 36 V Operational Amplifiers

Family

Rail-to-Rail I/O

PJFET

Low Noise

Single

OP1177

Dual

ADA4091-2

AD8682

OP2177

Quad

ADA4091-4

AD8684

OP4177