ANALOG DEVICES AD8607 Service Manual

Precision Micropower, Low Noise CMOS,

Rail-to-Rail Input/Output Operational Amplifiers

FEATURES

Low offset voltage: 50 μV maximum
Low input bias current: 1 pA maximum
Single-supply operation: 1.8 V to 5 V
Low noise: 22 nV/√Hz
Micropower: 50 μA maximum
Low distortion
No phase reversal
Unity gain stable

APPLICATIONS

Battery-powered instrumentation
Multipole filters
Sensors
Low power ASIC input or output amplifiers

GENERAL DESCRIPTION

The AD8603/AD8607/AD8609 are single/dual/quad micro­power rail-to-rail input and output amplifiers, respectively, that
feature very low offset voltage as well as low input voltage and
current noise.

These amplifiers use a patented trimming technique that achieves
superior precision without laser trimming. The parts are fully
specified to operate from 1.8 V to 5.0 V single supply or from
±0.9 V to ±2.5 V dual supply. The combination of low offsets, low
noise, very low input bias currents, and low power consumption
makes the AD8603/AD8607/AD8609 especially useful in portable
and loop-powered instrumentation.

The ability to swing rail to rail at both the input and output
enables designers to buffer CMOS ADCs, DACs, ASICs, and
other wide output swing devices in low power, single-supply
systems.

The AD8603 is available in a tiny 5-lead TSOT package. The
AD8607 is available in 8-lead MSOP and 8-lead SOIC packages.
The AD8609 is available in 14-lead TSSOP and 14-lead SOIC
packages.

AD8603/AD8607/AD8609

PIN CONFIGURATIONS

OUT

1

AD8603

TOP VIEW

V–

2

(Not to Scale)

+IN

3

Figure 1. 5-Lead TSOT (UJ Suffix)

1

OUT A

–IN A

+IN A

V–

AD8607

2

TOP VIEW

3

(Not to Scale)

4

Figure 2. 8-Lead MSOP (RM Suffix)

OUT A

1

V–

AD8607

2

3

TOP VIEW

(Not to Scale)

4

–IN A

+IN A

Figure 3. 8-Lead SOIC (R Suffix)

1

OUT A

2

–IN A

3

+IN A

V+

+IN B

–IN B

OUT B

AD8609

TOP VIEW

4

(Not to Scale)

5

6

7

Figure 4. 14-Lead TSSOP (RU Suffix)

OUT A

1

2

–IN A

3

+IN A

+IN B

–IN B

OUT B

V+

AD8609

TOP VIEW

4

(Not to Scale)

5

6

7

Figure 5. 14-Lead SOIC (R Suffix)

5

4

8

7

6

5

8

7

6

5

14

13

12

11

10

14

13

12

11

10

9

8

V+

OUT B

–IN B

+IN B

9

8

V+

–IN

V+

OUT B

–IN B

+IN B

OUT D

–IN D

+IN D

V–

+IN C

–IN C

OUT C

OUT D

–IN D

+IN D

V–

+IN C

–IN C

OUT C

04356-001

04356-002

04356-003

04356-004

4356-005

Rev. C

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: [phone] www.analog.com
Fax: [phone] ©2003–2008 Analog Devices, Inc. All rights reserved.

AD8603/AD8607/AD8609

TABLE OF CONTENTS

Features .............................................................................................. 1

Applicat ions ....................................................................................... 1

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

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

Revision History ............................................................................... 2

Specifications ..................................................................................... 3

Electrical Characteristics ............................................................. 3

Absolute Maximum Ratings ............................................................ 5

ESD Caution .................................................................................. 5

Typical Performance Characteristics ............................................. 6

REVISION HISTORY

6/08—Rev. B to Rev. C

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

Changes to Table 2 ............................................................................ 4

Changes to Figure 15 ........................................................................ 7

Changes to Figure 33 ...................................................................... 10

Changes to Figure 45 and Figure 47 ............................................. 13

Updated Outline Dimensions ....................................................... 14

Changes to Ordering Guide .......................................................... 16

6/05—Rev. A to Rev. B

Updated Figure 49 .......................................................................... 15

Changes to Ordering Guide .......................................................... 17

10/03—Rev. 0 to Rev. A

Added AD8607 and AD8609 Parts .................................. Universal

Changes to Specifications ................................................................ 3

Changes to Figure 35 ...................................................................... 10

Added Figure 41 .............................................................................. 11

8/03—Revision 0: Initial Version

Applicat ions ..................................................................................... 12

No Phase Reversal ...................................................................... 12

Input Overvoltage Protection ................................................... 12

Driving Capacitive Loads .......................................................... 12

Proximity Sensors ....................................................................... 13

Composite Amplifiers ................................................................ 13

Battery-Powered Applications .................................................. 13

Photodiodes ................................................................................ 13

Outline Dimensions ....................................................................... 14

Ordering Guide .......................................................................... 16

Rev. C | Page 2 of 16

AD8603/AD8607/AD8609

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

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

Table 1.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage VOS V

−0.3 V < VCM < +5.2 V 40 300 μV

−40°C < TA < +125°C, −0.3 V < VCM < +5.2 V 700 μV
Offset Voltage Drift ∆VOS/∆T −40°C < TA < +125°C 1 4.5 μV/°C
Input Bias Current IB 0.2 1 pA

−40°C < TA < +85°C 50 pA

−40°C < TA < +125°C 500 pA
Input Offset Current IOS 0.1 0.5 pA

−40°C < TA < +85°C 50 pA

−40°C < TA < +125°C 250 pA
Input Voltage Range IVR −0.3 +5.2 V
Common-Mode Rejection Ratio CMRR 0 V < VCM < 5 V 85 100 dB

−40°C < TA < +125°C 80 dB
Large Signal Voltage Gain AVO R

AD8603 400 1000 V/mV
AD8607/AD8609 250 450 V/mV

Input Capacitance C

C

1.9 pF

DIFF

2.5 pF

CM

OUTPUT CHARACTERISTICS

Output Voltage High VOH I

−40°C to +125°C 4.9 V

I

−40°C to +125°C 4.50 V
Output Voltage Low VOL I

−40°C to +125°C 50 mV

I

−40°C to +125°C 330 mV
Short-Circuit Current ISC ±70 mA
Closed-Loop Output Impedance Z

f = 10 kHz, AV = 1 36 Ω

OUT

POWER SUPPLY

Power Supply Rejection Ratio PSRR 1.8 V < VS < 5 V 80 100 dB
Supply Current per Amplifier ISY V

−40°C <TA < +125°C 60 μA

DYNAMIC PERFORMANCE

Slew Rate SR RL = 10 kΩ 0.1 V/μs
Settling Time 0.1% tS G = ±1, 2 V step 23 μs
Gain Bandwidth Product GBP RL = 100 kΩ 400 kHz

R

Phase Margin ØO R

NOISE PERFORMANCE

Peak-to-Peak Noise e

0.1 Hz to 10 Hz 2.3 3.5 μV

n p-p

Voltage Noise Density en f = 1 kHz 25 nV/√Hz

f = 10 kHz 22 nV/√Hz

Current Noise Density in f = 1 kHz 0.05 pA/√Hz
Channel Separation CS f = 10 kHz −115 dB
f = 100 kHz −110 dB

= 3.3 V @ VCM = 0.5 V and 2.8 V 12 50 μV

S

= 10 kΩ, 0.5 V < VO < 4.5 V

L

= 1 mA 4.95 4.97 V

L

= 10 mA 4.65 4.97 V

L

= 1 mA 16 30 mV

L

= 10 mA 160 250 mV

L

= 0 V 40 50 μA

O

= 10 kΩ 316 kHz

L

= 10 kΩ, RL = 100 kΩ 70 Degrees

L

Rev. C | Page 3 of 16

AD8603/AD8607/AD8609

VS = 1.8 V, VCM = VS/2, TA = 25°C, unless otherwise noted.

Table 2.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage VOS V

−0.3 V < VCM < +1.8 V 40 300 μV

−40°C < TA < +85°C, −0.3 V < VCM < +1.8 V 500 μV

−40°C < TA < +125°C, −0.3 V < VCM < +1.7 V 700 μV
Offset Voltage Drift ∆VOS/∆T −40°C < TA < +125°C 1 4.5 μV/°C
Input Bias Current IB 0.2 1 pA

−40°C < TA < +85°C 50 pA

−40°C < TA < +125°C 500 pA
Input Offset Current IOS 0.1 0.5 pA

−40°C < TA < +85°C 50 pA

−40°C < TA < +125°C 250 pA
Input Voltage Range IVR −0.3 +1.8 V
Common-Mode Rejection Ratio CMRR 0 V < VCM < 1.8 V 80 98 dB

−40°C < TA < +85°C 70 dB
Large Signal Voltage Gain AVO R

AD8603 150 3000 V/mV
AD8607/AD8609 100 2000 V/mV

Input Capacitance C

C

2.1 pF

DIFF

3.8 pF

CM

OUTPUT CHARACTERISTICS

Output Voltage High VOH I

−40°C to +125°C 1.6 V
Output Voltage Low VOL I

−40°C to +125°C 80 mV
Short-Circuit Current ISC ±10 mA
Closed-Loop Output Impedance Z

f = 10 kHz, AV = 1 36 Ω

OUT

POWER SUPPLY

Power Supply Rejection Ratio PSRR 1.8 V < VS < 5 V 80 100 dB
Supply Current per Amplifier ISY V

−40°C < TA < +85°C 60 μA

DYNAMIC PERFORMANCE

Slew Rate SR RL = 10 kΩ 0.1 V/μs
Settling Time 0.1% tS G = ±1, 1 V step 9.2 μs
Gain Bandwidth Product GBP RL = 100 kΩ 385 kHz

R

Phase Margin ØO R

NOISE PERFORMANCE

Peak-to-Peak Noise e

0.1 Hz to 10 Hz 2.3 3.5 μV

n p-p

Voltage Noise Density en f = 1 kHz 25 nV/√Hz

f = 10 kHz 22 nV/√Hz

Current Noise Density in f = 1 kHz 0.05 pA/√Hz
Channel Separation CS f = 10 kHz −115 dB
f = 100 kHz −110 dB

= 3.3 V @ VCM = 0.5 V and 2.8 V 12 50 μV

S

= 10 kΩ, 0.5 V < VO < 4.5 V

L

= 1 mA 1.65 1.72 V

L

= 1 mA 38 60 mV

L

= 0 V 40 50 μA

O

= 10 kΩ 316 kHz

L

= 10 kΩ, RL = 100 kΩ 70 Degrees

L

Rev. C | Page 4 of 16

AD8603/AD8607/AD8609

ABSOLUTE MAXIMUM RATINGS

Absolute maximum ratings apply at 25°C, unless otherwise noted.

Table 3.

Parameter Rating

Supply Voltage 6 V
Input Voltage GND to VS
Differential Input Voltage ±6 V
Output Short-Circuit Duration to GND Indefinite
Storage Temperature Range −65°C to +150°C
Lead Temperature (Soldering, 60 sec) 300°C
Operating Temperature Range −40°C to +125°C
Junction Temperature Range −65°C to +150°C

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 Characteristics

Package Type θ

5-Lead TSOT (UJ) 207 61 °C/W
8-Lead MSOP (RM) 210 45 °C/W
8-Lead SOIC_N (R) 158 43 °C/W
14-Lead SOIC_N (R) 120 36 °C/W
14-Lead TSSOP (RU) 180 35 °C/W

1

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

device soldered in a circuit board for surface-mount packages.

1

θJC Unit

JA

ESD CAUTION

Rev. C | Page 5 of 16