10 μA, Rail-to-Rail I/O, Zero Input

Crossover Distortion Amplifiers

ADA4505-2/ADA4505-4

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

©2008 Analog Devices, Inc. All rights reserved.

FEATURES

PSRR: 100 dB minimum

CMRR: 105 dB typical

Very low supply current: 10 μA per amplifier maximum

1.8 V to 5 V single-supply or ±0.9 V to ±2.5 V dual-supply

operation

Rail-to-rail input and output

3 mV offset voltage maximum

Very low input bias current: 0.5 pA typical

APPLICATIONS

Pressure and position sensors

Remote security

Medical monitors

Battery-powered consumer equipment

Hazard detectors

PIN CONFIGURATIONS

V+

8

OUT B

7

–IN B

6

+IN B

5

ADA4505-2

TOP VIEW

(Not to Scale)

Figure 1. 8-Lead MSOP (RM-8)

BALL A1

CORNER

(BALL SIDE DOWN)

ADA4505-2

TOP VIEW

OUT B

V+

OUT A

A1

A2

A3

+IN B

V–

+IN A

C1

C2

C3

–IN B

–IN A

B1

B3

Figure 2. 8-Ball WLCSP (CB-8-2)

ADA4505-4

1

2

3

4

5

6

7

N A

A

V+

–I

+IN

OUT

–I

+IN

B

N B

B

UT A

14

13

12

11

10

9

8

–IN D

+IN D

V–

OU

–IN C

+IN C

OU

TOP VIEW

(Not to Scale)

T C

T D

O

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

GENERAL DESCRIPTION

The ADA4505-2/ADA4505-4 are dual and quad micropower

amplifiers featuring rail-to-rail input and output swings while

operating from a single 1.8 V to 5 V power supply or from dual

±0.9 V to ±2.5 V power supplies.

Employing a new circuit technology, these low cost amplifiers

offer zero input crossover distortion (excellent PSRR and CMRR

performance) and very low bias current, while operating with a

supply current of less than 10 μA per amplifier.

This combination of features makes the ADA4505-2/ADA4505-4

amplifiers ideal choices for battery-powered applications because

they minimize errors due to power supply voltage variations

over the lifetime of the battery, and maintain high CMRR even

for a rail-to-rail op amp.

Remote battery-powered sensors, handheld instrumentation

and consumer equipment, hazard detectors (for example, smoke,

fire, and gas), and patient monitors can benefit from the features

of the ADA4505-2/ADA4505-4 amplifiers.

The ADA4505-2/ADA4505-4 are specified for both the industrial

temperature range (−40°C to +85°C) and the extended industrial

temperature range (−40°C to +125°C). The ADA4505-2 dual

amplifier is available in standard 8-lead MSOP and 8-ball WLCSP

packages. The ADA4505-4 quad amplifier is available in a 14-lead

TSSOP package.

The ADA4505-2/ADA4505-4 are members of a growing series

of zero crossover op amps offered by Analog Devices, Inc.,

including the AD8506/AD8508, which also operate from a

single 1.8 V to 5 V power supply or from dual ±0.9 V to ±2.5 V

power supplies.