ANALOG DEVICES AD8605, AD8608 Service Manual

Precision, Low Noise, CMOS, Rail-to-Rail,

Input/Output Operational Amplifiers

AD8605/AD8606/AD8608

Rev. L

rights of third parties that may result from its use. Specifications subject to change without notice. No

Trademarks and registered trademarks are the property of thei r respective owners.

Fax: [phone] ©2002–2012 Analog Devices, Inc. All rights reserved.

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AD8605

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AD8606

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AD8605 ONLY

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AD8608

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AD8606

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AD8608

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Data Sheet

FEATURES

Low offset voltage: 65 µV maximum
Low input bias currents: 1 pA maximum
Low noise: 8 nV/√Hz
Wide bandwidth: 10 MH
High open-loop gain: 1000 V/mV
Unity gain stable
Single-supply operation: 2.7 V to 5.5 V
5-ball WLCSP for single (AD8605) and 8-ball WLCSP for

dual (AD8606)

APPLICATIONS

Photodiode amplification
Battery-powered instrumentation
Multipole filters
Sensors
Barcode scanners
Audio

Z

PIN CONFIGURATIONS

Figure 1. 5-Lead SOT-23 (RJ Suffix) Figure 2. 8-Ball WLCSP (CB Suffix)

GENERAL DESCRIPTION

The AD8605, AD8606, and AD86081 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 the Analog Devices,
Inc. 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 5-lead SOT-23 and 5-ball WLCSP

packages. The AD8606 dual is available in an 8-lead MSOP, an
8-ball WLSCP, and a narrow SOIC surface-mounted package.
The AD8608 quad is available in a 14-lead TSSOP package and
a narrow 14-lead SOIC package. The 5-ball and 8-ball WLCSP
offer the smallest available footprint for any surface-mounted
operational amplifier. The WLCSP, SOT-23, MSOP, and TSSOP
versions are available in tape-and-reel only.

1

Protected by U.S. Patent No. 5,969,657.

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

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

Figure 3. 5-Ball WLCSP (CB Suffix) Figure 4. 14-Lead SOIC_N (R Suffix)

Figure 5. 8-Lead MSOP (RM Suffix),

Figure 6. 14-Lead TSSOP (RU Suffix)

8-Lead SOIC_N (R Suffix)

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com

AD8605/AD8606/AD8608 Data Sheet

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications ....................................................................................... 1

General Description ......................................................................... 1

Pin Configurations ........................................................................... 1

Revision History ............................................................................... 3

5 V Electrical Specifications ............................................................ 4

2.7 V Electrical Specifications ......................................................... 6

Absolute Maximum Ratings ............................................................ 8

ESD Caution .................................................................................. 8

Typical Performance Characteristics ............................................. 9

Applications Information .............................................................. 16

Output Phase Reversal ............................................................... 16

Maximum Power Dissipation ................................................... 16

Input Overvoltage Protection ................................................... 16

THD + Noise ............................................................................... 16

Total Noise Including Source Resistors ................................... 17

Channel Separation .................................................................... 17

Capacitive Load Drive ............................................................... 17

Light Sensitivity .......................................................................... 18

WLCSP Assembly Considerations ........................................... 18

I-V Conversion Applications ........................................................ 19

Photodiode Preamplifier Applications .................................... 19

Audio and PDA Applications ................................................... 19

Instrumentation Amplifiers ...................................................... 20

DAC Conversion ........................................................................ 20

Outline Dimensions ....................................................................... 21

Ordering Guide .......................................................................... 24

Rev. L | Page 2 of 24

Data Sheet AD8605/AD8606/AD8608

REVISION HISTORY

2/12—Rev. K to Rev. L

Changed Functional Block Diagrams Section to Pin

Configuration Section ................................................................. 1

Changes to Figure 11 ................................................................... 9

Added Figure 33 ......................................................................... 13

8/11—Rev. J to Re v. K

Changes to Figure 20 ................................................................... 2

Updated Outline Dimensions ................................................... 20

Changes to Ordering Guide ...................................................... 23

8/10—Rev. I to R e v. J

Changes to Figure 10 and Figure 11 .......................................... 9

Changes to Figure 15 ................................................................. 10

Changes to Figure 36 ................................................................. 13

Changes to Figure 42 ................................................................. 14

Updated Outline Dimensions ................................................... 20

Changes to Ordering Guide ...................................................... 23

9/08—Rev. H to Rev. I

Changes to Input Overvoltage Protection Section ................ 15

Changes to Ordering Guide ...................................................... 22

2/08—Rev. G to Rev. H

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

Changes to Table 1 ....................................................................... 4

Changes to Table 2 ....................................................................... 6

Changes to Figure 11 ................................................................... 9

Changes to Figure 13, Figure 14, and Figure 16 Captions .... 10

Changes to Figure 15, Figure 17, and Figure 18 ..................... 10

Changes to Figure 34 and Figure 35 Captions ........................ 13

Changes to Figure 36 ................................................................. 13

Changes to Figure 37 Caption .................................................. 14

Changes to Figure 38 and Figure 41 ........................................ 14

Changes to Figure 45 ................................................................. 15

Changes to Audio and PDA Applications Section ................. 18

Changes to Figure 52 ................................................................. 18

Changes to Ordering Guide ...................................................... 22

10/07—Rev. F to Rev. G

Changes to Figure 2 ...................................................................... 1

Updated Outline Dimensions ................................................... 20

8/07—Rev. E to Re v. F

Added 8-Ball WLCSP Package ..................................... Universal

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

Changes to Table 1 ....................................................................... 3

Changes to Table 2 ....................................................................... 5

Changes to Table 4 ....................................................................... 7

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

Changes to Ordering Guide ...................................................... 21

1/06—Rev. D to Rev. E

Changes to Table 1 ....................................................................... 3

Changes to Table 2 ....................................................................... 5

Changes to Table 4 ........................................................................ 6

Changes to Figure 12 Caption ..................................................... 8

Changes to Figure 26 and Figure 27 Captions ....................... 11

Changes to Figure 33 Caption .................................................. 12

Changes to Figure 44 ................................................................. 14

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

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

5/04—Rev. C to R e v. D

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

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

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

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

7/03—Rev. B to R e v. 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; Renumbered Subsequently .................. 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—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—Rev. 0 to Rev. A

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

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

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

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

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

5/02—Revision 0: Initial Version

Rev. L | Page 3 of 24

AD8605/AD8606/AD8608 Data Sheet

Offset Voltage

VOS

Input Bias Current

IB

0.2

1

pA

−40°C < TA < +85°C

20

pA

IL= 10 mA

170

210

mV

AD8608

VS = 2.7 V to 5.5 V

77

92 dB

Phase Margin

ΦM 65 Degrees

5 V ELECTRICAL SPECIFICATIONS

VS = 5 V, VCM = VS/2, TA = 25°C, unless otherwise noted.

Table 1.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

AD8605/AD8606 (Except WLCSP) VS = 3.5 V, VCM = 3 V 20 65 µV
AD8608 VS = 3.5 V, VCM = 2.7 V 20 75 µV
AD8605/AD8606/AD8608 VS = 5 V, VCM = 0 V to 5 V 80 300 µV

−40°C < TA < +125°C 750 µV

AD8605/AD8606 −40°C < TA < +85°C 50 pA
AD8605/AD8606 −40°C < TA < +125°C 250 pA
AD8608 −40°C < TA < +85°C 100 pA
AD8608 −40°C < TA < +125°C 300 pA

Input Offset Current IOS 0.1 0.5 pA

−40°C < TA < +125°C 75 pA

Input Voltage Range 0 5 V

Common-Mode Rejection Ratio CMRR VCM = 0 V to 5 V 85 100 dB

−40°C < TA < +125°C 75 90 dB

Large Signal Voltage Gain AVO RL = 2 kΩ, VO = 0.5 V to 4.5 V 300 1000 V/mV

Offset Voltage Drift

AD8605/AD8606 ΔVOS/ΔT −40°C < TA < +125°C 1 4.5 µV/°C
AD8608 ΔVOS/ΔT −40°C < TA < +125°C 1.5 6.0 µV/°C

INPUT CAPACITANCE

Common-Mode Input Capacitance C

Differential Input Capacitance C
OUTPUT CHARACTERISTICS

Output Voltage High VOH IL = 1 mA 4.96 4.98 V

IL = 10 mA 4.7 4.79 V

−40°C < TA < +125°C 4.6 V

Output Voltage Low VOL IL = 1 mA 20 40 mV

8.8 pF

COM

2.6 pF

DIFF

−40°C < TA < +125°C 290 mV

Output Current I

Closed-Loop Output Impedance Z
POWER SUPPLY

Power Supply Rejection Ratio PSRR

AD8605/AD8606 VS = 2.7 V to 5.5 V 80 95 dB
AD8605/AD8606 WLCSP VS = 2.7 V to 5.5 V 75 92 dB

−40°C < TA < +125°C 70 90 dB

Supply Current/Amplifier ISY I

−40°C < TA < +125°C 1.4 mA
DYNAMIC PERFORMANCE

Slew Rate SR RL = 2 kΩ, CL = 16 pF 5 V/µs

Settling Time tS To 0.01%, 0 V to 2 V step, AV = 1 <1 µs

Unity Gain Bandwidth Product GBP 10 MHz

±80 mA

OUT

f = 1 MHz, AV = 1 1 Ω

OUT

= 0 mA 1 1.2 mA

OUT

Rev. L | Page 4 of 24

Data Sheet AD8605/AD8606/AD8608

Current Noise Density

in

f = 1 kHz

0.01 pA/√Hz

Parameter Symbol Conditions Min Typ Max Unit

NOISE PERFORMANCE

Peak-to-Peak Noise en p-p f = 0.1 Hz to 10 Hz 2.3 3.5 µV p-p
Voltage Noise Density en f = 1 kHz 8 12 nV/√Hz
en f = 10 kHz 6.5 nV/√Hz

Rev. L | Page 5 of 24

AD8605/AD8606/AD8608 Data Sheet

Offset Voltage

VOS

Input Bias Current

IB

0.2

1

pA

−40°C < TA < +85°C

20

pA

Output Current

I

±30 mA

POWER SUPPLY

Supply Current/Amplifier

I

I

= 0 mA

1.15

1.4

mA

Slew Rate

SR

RL = 2 kΩ, CL = 16 pF

5 V/µs

2.7 V ELECTRICAL SPECIFICATIONS

VS = 2.7 V, VCM = VS/2, TA = 25°C, unless otherwise noted.

Table 2.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

AD8605/AD8606 (Except WLCSP) VS = 3.5 V, VCM = 3 V 20 65 µV
AD8608 VS = 3.5 V, VCM = 2.7 V 20 75 µV
AD8605/AD8606/AD8608 VS = 2.7 V, VCM = 0 V to 2.7 V 80 300 µV

−40°C < TA < +125°C 750 µV

AD8605/AD8606 −40°C < TA < +85°C 50 pA
AD8605/AD8606 −40°C < TA < +125°C 250 pA
AD8608 −40°C < TA < +85°C 100 pA
AD8608 −40°C < TA < +125°C 300 pA

Input Offset Current IOS 0.1 0.5 pA

−40°C < TA < +125°C 75 pA

Input Voltage Range 0 2.7 V

Common-Mode Rejection Ratio CMRR VCM = 0 V to 2.7 V 80 95 dB

−40°C < TA < +125°C 70 85 dB

Large Signal Voltage Gain AVO RL = 2 kΩ, VO = 0.5 V to 2.2 V 110 350 V/mV

Offset Voltage Drift

AD8605/AD8606 ΔVOS/ΔT −40°C < TA < +125°C 1 4.5 µV/°C
AD8608 ΔVOS/ΔT −40°C < TA < +125°C 1.5 6.0 µV/°C

INPUT CAPACITANCE

Common-Mode Input Capacitance C

Differential Input Capacitance C
OUTPUT CHARACTERISTICS

Output Voltage High VOH IL = 1 mA 2.6 2.66 V

−40°C < TA < +125°C 2.6 V

Output Voltage Low VOL IL = 1 mA 25 40 mV

−40°C < TA < +125°C 50 mV

Closed-Loop Output Impedance Z

8.8 pF

COM

2.6 pF

DIFF

OUT

f = 1 MHz, AV = 1 1.2 Ω

OUT

Power Supply Rejection Ratio PSRR

AD8605/AD8606 VS = 2.7 V to 5.5 V 80 95 dB
AD8605/AD8606 WLCSP VS = 2.7 V to 5.5 V 75 92 dB
AD8608 VS = 2.7 V to 5.5 V 77 92 dB

−40°C < TA < +125°C 70 90 dB

−40°C < TA < +125°C 1.5 mA
DYNAMIC PERFORMANCE

Settling Time tS To 0.01%, 0 V to 1 V step, AV = 1 <0.5 µs

Unity Gain Bandwidth Product GBP 9 MHz

Phase Margin Φ

SY

M

OUT

50 Degrees

Rev. L | Page 6 of 24

Data Sheet AD8605/AD8606/AD8608

Current Noise Density

in

f = 1 kHz

0.01 pA/√Hz

Parameter Symbol Conditions Min Typ Max Unit

NOISE PERFORMANCE

Peak-to-Peak Noise en p-p f = 0.1 Hz to 10 Hz 2.3 3.5 µV p-p
Voltage Noise Density en f = 1 kHz 8 12 nV/√Hz
en f = 10 kHz 6.5 nV/√Hz

Rev. L | Page 7 of 24

AD8605/AD8606/AD8608 Data Sheet

All Packages

−65°C to +150°C

All Packages

−65°C to +150°C

14-Lead TSSOP (RU)

148

23

°C/W

ABSOLUTE MAXIMUM RATINGS

Table 3.

Parameter Rating

Supply Voltage 6 V
Input Voltage GND to V
Differential Input Voltage 6 V
Output Short-Circuit Duration to GND Observe Derating Curves
Storage Temperature Range

Operating Temperature Range

All Packages −40°C to +125°C
Junction Temperature Range

Lead Temperature (Soldering, 60 sec) 300°C

S

Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.

Table 4.

Package Type θ

5-Ball WLCSP (CB) 170 °C/W
5-Lead SOT-23 (RJ) 240 92 °C/W
8-Ball WLCSP (CB) 115 °C/W
8-Lead MSOP (RM) 206 44 °C/W
8-Lead SOIC_N (R) 157 56 °C/W
14-Lead SOIC_N (R) 105 36 °C/W

1

θJA is specified for the worst-case conditions, that is, a device soldered in a

circuit board for surface-mount packages.

1

θJC Unit

JA

ESD CAUTION

Rev. L | Page 8 of 24