Precision Low Noise CMOS Rail-to-Rail

Input/Output Operational Amplifiers

AD8605/AD8606/AD8608

Rev. D

Information furnished by Analog Devices is believed to be accurate and reliable.

However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

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

Tel: 781.329.4700 www.analog.com

FEATURES

Low offset voltage: 65 µV maximum

Low input bias currents: 1 pA maximum

Low noise: 8 nV/√

Wide bandwidth: 10 MHz

High open-loop gain: 120 dB

Unity gain stable

Single-supply operation: 2.7 V to 5.5 V

MicroCSP™

GENERAL DESCRIPTION

The AD8605, AD8606, and AD8608

are single, dual, and quad

rail-to-rail input and output, single-supply amplifiers. They

feature very low offset voltage, low input voltage and current

noise, and wide signal bandwidth. They use Analog Devices’

patented DigiTrim® trimming technique, which achieves

superior precision without laser trimming.

The combination of low offsets, low noise, very low input bias

currents, and high speed makes these amplifiers useful in a

wide variety of applications. Filters, integrators, photodiode

amplifiers, and high impedance sensors all benefit from the

combination of performance features. Audio and other ac

applications benefit from the wide bandwidth and low

distortion. Applications for these amplifiers include optical

control loops, portable and loop-powered instrumentation,

and audio amplification for portable devices.

The AD8605, AD8606, and AD8608 are specified over the

extended industrial temperature range (−40°C to +125°C). The

AD8605 single is available in the 5-lead SOT-23 and 5-bump

MicroCSP packages. The 5-bump MicroCSP offers the smallest

available footprint for any surface-mount operational amplifier.

The AD8606 dual is available in an 8-lead MSOP package and a

narrow SOIC surface-mount package. The AD8608 quad is

available in a 14-lead TSSOP and a narrow 14-lead SOIC

package. MicroCSP, SOT, MSOP, and TSSOP versions are

available in tape and reel only.

Protected by U.S. Patent No. 5,969,657; other patents pending.

APPLICATIONS

Photodiode amplification

Battery-powered instrumentation

Multipole filters

Sensors

Barcode scanners

Audio

FUNCTIONAL BLOCK DIAGRAMS

–IN

+IN

V+

OUT

AD8605

V–

02731-D-001

AD8608

–IN A

V–

+IN A

OUT B

–IN B

V+

+IN B

OUT

02731-D-005

Figure 1. 5-Lead SOT-23 (RT Suffix) Figure 2. 8-Lead SOIC (R Suffix)

AD8605 ONLY

OUT V+

V–

+IN –IN

TOP VIEW

(BUMP SIDE DOWN)

02731-D-006

–IN A

+IN A

V+

+IN B

–IN B

OUT B

OUT D

–IN D

+IN D

V–

+IN C

–IN C

OUT C

OUT A

AD8608

02731-D-004

Figure 3. 5-Bump MicroCSP

(CB Suffix)

Figure 4. 14-Lead SOIC (R Suffix)

–IN A

+IN A

V–

OUT B

–IN B

+IN B

V+

AD8606

OUT A

02731-D-003

–IN A

+IN A

V+

+IN B

–IN B

UT B

–IN D

+IN D

V–

OUT D

–IN C

OUT C

+IN C

AD8608

02731-D-002

Figure 5. 8-Lead MSOP (RM Suffix) Figure 6. 14-Lead TSSOP (RU Suffix)

AD8605/AD8606/AD8608

Rev. D | Page 2 of 20

TABLE OF CONTENTS

5 V Electrical Specifications............................................................ 3

2.7 V Electrical Specifications......................................................... 5

Absolute Maximum Ratings............................................................ 6

ESD Caution.................................................................................. 6

Typical Performance Characteristics ............................................. 7

Application Information................................................................ 13

Output Phase Reversal............................................................... 13

Maximum Power Dissipation ................................................... 13

Input Overvoltage Protection................................................... 13

THD + Noise............................................................................... 13

Total Noise Including Source Resistors................................... 14

Channel Separation.................................................................... 14

Capacitive Load Drive ............................................................... 14

Light Sensitivity .......................................................................... 15

MicroCSP Assembly Considerations....................................... 15

I-V Conversion Applications ........................................................ 16

Photodiode Preamplifier Applications .................................... 16

Audio and PDA Applications ................................................... 16

Instrumentation Amplifiers...................................................... 17

D/A Conversion ......................................................................... 17

Outline Dimensions....................................................................... 18

Ordering Guide .......................................................................... 19

REVISION HISTORY

5/04—Data Sheet Changed from Rev. C to Rev. D

Updated Format............................................................. Universal

Edit to Light Sensitivity Section ...............................................16

Updated Outline Dimensions...................................................19

Changes to Ordering Guide ......................................................20

7/03—Data Sheet Changed from Rev. B to Rev. C

Changes to Features.......................................................................1

Change to General Description...................................................1

Addition to Functional Block Diagrams .................................... 1

Addition to Absolute Maximum Ratings ...................................4

Addition to Ordering Guide ........................................................4

Change to Equation In Maximum Power Dissipation

Section........................................................................................11

Added Light Sensitivity Section.................................................12

Added New Figure 8 and Renumbered Subsequent Figures .13

Added New MicroCSP Assembly Considerations Section ....13

Changes to Figure 9.....................................................................13

Change to Equation in Photodiode Preamplifier

Applications Section ................................................................13

Changes to Figure 12...................................................................14

Change to Equation in D/A Conversion Section....................14

Updated Outline Dimensions ...................................................15

3/03—Data Sheet Changed from Rev. A to Rev. B

Changes to Functional Block Diagram....................................... 1

Changes to Absolute Maximum Ratings.................................... 4

Changes to Ordering Guide ....................................................... 4

Changes to Figure 9 .................................................................... 13

Updated Outline Dimensions.................................................... 15

11/02—Data Sheet Changed from Rev. 0 to Rev. A

Change to Electrical Characteristics........................................... 2

Changes to Absolute Maximum Ratings.................................... 4

Changes Ordering Guide ............................................................. 4

Change to TPC 6 .......................................................................... 5

Updated Outline Dimensions.................................................... 15

AD8605/AD8606/AD8608

Rev. D | Page 3 of 20

5 V ELECTRICAL SPECIFICATIONS

Table 1. @ V

= 5 V, V

= V

/2, T

= 25°C, unless otherwise noted.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage V

AD8605/AD8606 V

= 3.5 V, V

= 3 V 20 65 µV

AD8608 V

= 3.5 V, V

= 2.7 V 20 75 µV

= 5 V, V

= 0 V to 5 V 80 300 µV

−40°C < T

< +125°C 750 µV

Input Bias Current I

0.2 1 pA

AD8605/AD8606 −40°C < T

< +85°C 50 pA

AD8605/AD8606 −40°C < T

< +125°C 250 pA

AD8608 −40°C < T

< +85°C 100 pA

AD8608 −40°C < T

< +125°C 300 pA

Input Offset Current I

0.1 0.5 pA

−40°C < T

< +85°C 20 pA

−40°C < T

< +125°C 75 pA

Input Voltage Range 0 5 V

Common-Mode Rejection Ratio CMRR V

= 0 V to 5 V 85 100 dB

−40°C < T

< +125°C 75 90 dB

Large Signal Voltage Gain A

= 0.5 V to 4.5 V 300 1,000 V/mV

= 2 kΩ, V

= 0 V

Offset Voltage Drift

AD8605/AD8606 ∆V

/∆T 1 4.5 µV/°C

AD8608 ∆V

/∆T 1.5 6.0 µV/°C

INPUT CAPACITANCE

Common-Mode Input Capacitance 8.8 pF

Differential Input Capacitance 2.59 pF

OUTPUT CHARACTERISTICS

Output Voltage High V

= 1 mA 4.96 4.98 V

= 10 mA 4.7 4.79 V

−40°C < T

< +125°C 4.6 V

Output Voltage Low V

= 1 mA 20 40 mV

= 10 mA 170 210 mV

−40°C < T

< +125°C 290 mV

Output Current I

OUT

±80 mA

Closed-Loop Output Impedance Z

OUT

f = 1 MHz, A

= 1 10 Ω

POWER SUPPLY

Power Supply Rejection Ratio PSRR

AD8605/AD8606 V

= 2.7 V to 5.5 V 80 95 dB

AD8608 V

= 2.7 V to 5.5 V 77 92 dB

−40°C < T

< +125°C 70 90 dB

Supply Current/Amplifier I

= 0 V 1 1.2 mA

−40°C < T

< +125°C 1.4 mA

DYNAMIC PERFORMANCE

Slew Rate SR R

= 2 kΩ 5 V/µs

Settling Time t

To 0.01%, 0 V to 2 V step < 1 µs

Full Power Bandwidth BW

< 1% distortion 360 kHz

Gain Bandwidth Product GBP 10 MHz

Phase Margin

65 Degrees

Part #	AD8608AR
Description	OP Amp Quad GP R-R I/O 5.5V 14-Pin SOIC N - Rail/Tube
Category	IC
Availability	In Stock
Qty	15

Qty	Price
1 - 3	$3.30628
4 - 6	$2.63000
7 - 9	$2.47971
10 - 12	$2.30438
13 +	$2.05390

AD8608AR

Related Items

Technical Document