ANALOG DEVICES AD8651, AD8652 Service Manual

50 MHz, Precision, Low Distortion,

O

www.BDTIC.com/ADI

FEATURES

Bandwidth: 50 MHz @ 5 V
Low noise: 4.5 nV/√Hz
Offset voltage: 100 μV typical, specified over

entire common-mode range
Slew rate: 41 V/μs
Rail-to-rail input and output swing
Input bias current: 1 pA
Single-supply operation: 2.7 V to 5.5 V
Space-saving MSOP and SOIC_N packaging

APPLICATIONS

Optical communications
Laser source drivers/controllers
Broadband communications
High speed ADCs and DACs
Microwave link interface
Cell phone PA control
Video line drivers
Audio

Low Noise CMOS Amplifiers

AD8651/AD8652

PIN CONFIGURATIONS

+

UT A

NC

1

AD8651

–IN

2

TOP VIEW

+IN

3

(Not to Scale)

–

4

V

NC = NO CONNECT

NC

8

+

7

V

OUT

6

NC

5

03301-001

–IN A

+IN A

–

V

1

AD8652

2

TOP VIEW

3

(Not to Scale)

4

Figure 1. 8-Lead MSOP (RM-8) Figure 2. 8-Lead MSOP (RM-8)

1

NC

AD8651

–IN

2

+IN

3

TOP VIEW

(Not to Scale)

–

4

V

NC = NO CONNECT

8

NC

+

7

V

OUT

6

NC

5

03301-002

OUT A

–IN A

+IN A

–

V

1

AD8652

2

3

TOP VIEW

(Not to Scale)

4

Figure 3. 8-Lead SOIC_N (R-8) Figure 4. 8-Lead SOIC_N (R-8)

8

7

6

5

8

7

6

5

V

OUT B

–IN B

+IN B

+

V

OUT B

–IN B

+IN B

03301-003

03301-004

GENERAL DESCRIPTION

The AD865x family consists of high precision, low noise, low
distortion, rail-to-rail CMOS operational amplifiers that run
from a single-supply voltage of 2.7 V to 5.5 V.

The AD865x family is made up of rail-to-rail input and output

mplifiers with a gain bandwidth of 50 MHz and a typical

a
voltage offset of 100 μV across common mode from a 5 V
supply. It also features low noise—4.5 nV/√Hz.

The AD865x family can be used in communications
ap

plications, such as cell phone transmission power control, fiber
optic networking, wireless networking, and video line drivers.

The AD865x family features the newest generation of DigiTrim®

ackage trimming. This new generation measures and

in-p
corrects the offset over the entire input common-mode range,
providing less distortion from V

variation than is typical of

OS

other rail-to-rail amplifiers. Offset voltage and CMRR are both
specified and guaranteed over the entire common-mode range
as well as over the extended industrial temperature range.

The AD865x family is offered in the narrow 8-lead SOIC

ackage and the 8-lead MSOP package. The amplifiers are

p
specified over the extended industrial temperature range
(−40°C to +125°C).

Rev. C

Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
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] ©2006 Analog Devices, Inc. All rights reserved.

AD8651/AD8652

www.BDTIC.com/ADI

TABLE OF CONTENTS

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

Input Protection ..................................................................... 15

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

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

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

Specifications..................................................................................... 3

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

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

Thermal Resistance ...................................................................... 5

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

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

Applications..................................................................................... 14

Theory of Operation ..................................................................14

Rail-to-Rail Output Stage...................................................... 14

Rail-to-Rail Input Stage......................................................... 14

REVISION HISTORY

8/06—Rev. B. to Rev. C

Changes to Figure 1 to Figure 4...................................................... 1

Changes to Figure 7 and Figure 9................................................... 6

Changes to Figure 23........................................................................ 9

Changes to Figure 53...................................................................... 14

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

Changes to Ordering Guide.......................................................... 19

9/04—Rev. A to Rev. B

dded AD8652 ....................................................................Universal

A

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

Changes to Electrical Characteristics ............................................. 3

Changes to Absolute Maximum Ratings........................................ 5

Change to Figure 23 .......................................................................... 9

Change to Figure 26 .......................................................................... 9

Change to Figure 36 ........................................................................ 11

Change to Figure 42 ........................................................................ 12

Change to Figure 49 ........................................................................ 13

Change to Figure 51 ........................................................................ 13

Inserted Figure 52............................................................................ 13

Change to Theory of Operation section....................................... 14

Overdrive Recovery ............................................................... 15

Layout, Grounding, and Bypassing Considerations.............. 15

Power Supply Bypassing........................................................ 15

Grounding............................................................................... 15

Leakage Currents.................................................................... 15

Input Capacitance .................................................................. 16

Output Capacitance............................................................... 16

Settling Time........................................................................... 16

THD Readings vs. Common-Mode Voltage ...................... 16

Driving a 16-Bit ADC............................................................ 17

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

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

Change to Input Protection section.............................................. 15

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

6/04—Rev. 0 to Rev. A

C

hange to Figure 18.............................................................................8

Change to Figure 21.............................................................................9

Change to Figure 29.............................................................................10

Change to Figure 30.............................................................................10

Change to Figure 43.............................................................................12

Change to Figure 44.............................................................................12

Change to Figure 47.............................................................................13

Change to Figure 57.............................................................................17

10/03 Revision 0: Initial Version

Rev. C | Page 2 of 20

AD8651/AD8652

www.BDTIC.com/ADI

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

V+ = 2.7 V, V– = 0 V, VCM = V+/2, TA = 25°C, unless otherwise specified.

Table 1.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage V

AD8651 0 V ≤ VCM ≤ 2.7 V 100 350 V
–40°C ≤ TA ≤ +85°C, 0 V ≤ VCM ≤ 2.7 V 1.4 mV
–40°C ≤ TA ≤ +125°C, 0 V ≤ VCM ≤ 2.7 V 1.6 mV

AD8652 0 V ≤ VCM ≤ 2.7 V 90 300 V
–40°C ≤ TA ≤ +125°C, 0 V ≤ VCM ≤ 2.7 V 0.4 1.3 mV

Offset Voltage Drift TCV
Input Bias Current I

–40°C ≤ TA ≤ +125°C 600 pA

Input Offset Current I
–40°C ≤ TA ≤ +85°C 30 pA
–40°C ≤ TA ≤ +125°C 600 pA

Input Voltage Range V

Common-Mode Rejection Ratio CMRR

AD8651 V+ = 2.7 V, –0.1 V < VCM < +2.8 V 75 95 dB
–40°C ≤ TA ≤ +85°C, –0.1 V < VCM < +2.8 V 70 88 dB
–40°C ≤ TA ≤ +125°C, –0.1 V < VCM < +2.8 V 65 85 dB

AD8652 V+ = 2.7 V, –0.1 V < VCM < +2.8 V 77 95 dB
–40°C ≤ TA ≤ +125°C, –0.1 V < VCM < +2.8 V 73 90 dB

Large Signal Voltage Gain A
R
R
OUTPUT CHARACTERISTICS

Output Voltage High V

Output Voltage Low V

Short-Circuit Limit I
Sinking 80 mA

Output Current I
POWER SUPPLY

Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.5 V, VCM = 0 V 76 94 dB
–40°C ≤ TA ≤ +125°C 74 93 dB

Supply Current I

AD8651 IO = 0 9 12 mA

–40°C ≤ TA ≤ +125°C 14.5 mA

AD8652 IO = 0 17.5 19.5 mA
–40°C ≤ TA ≤ +125°C 22.5 mA
INPUT CAPACITANCE C

Differential 6 pF
Common Mode 9 pF

DYNAMIC PERFORMANCE

Slew Rate SR G = 1, RL = 10 kΩ 41 V/s
Gain Bandwidth Product GBP G = 1 50 MHz
Settling Time, 0.01% G = ±1, 2 V step 0.2 s
Overload Recovery Time VIN × G = 1.48 V
Total Harmonic Distortion + Noise THD + N G = 1, RL = 600 Ω, f = 1 kHz, VIN = 2 V p-p 0.0006 %

NOISE PERFORMANCE

Voltage Noise Density e

f = 100 kHz 4.5 nV/√Hz

Current Noise Density i

OS

OS

B

OS

CM

VO

OH

OL

SC

O

SY

IN

n

n

4 V/°C
1 10 pA

1 10 pA

–0.1 +2.8 V

RL = 1 kΩ, 200 mV < VO < 2.5 V 100 115 dB

= 1 kΩ, 200 mV < VO < 2.5 V, TA = 85°C 100 114 dB

L

= 1 kΩ, 200 mV < VO < 2.5 V, TA = 125°C 95 108 dB

L

IL = 250 A, –40°C ≤ TA ≤ +125°C 2.67 V
IL = 250 A, –40°C ≤ TA ≤ +125°C 30 mV
Sourcing 80 mA

40 mA

+

f = 10 kHz 5 nV/√Hz

f = 10 kHz 4 fA/√Hz

0.1 s

Rev. C | Page 3 of 20

AD8651/AD8652

www.BDTIC.com/ADI

V+ = 5 V, V– = 0 V, VCM = V+/2, TA = 25°C, unless otherwise specified.

Table 2.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage V

AD8651 0 V ≤ VCM ≤ 5 V 100 350 V

–40°C ≤ TA ≤ +85°C, 0 V ≤ VCM ≤ 5 V 1.4 mV
–40°C ≤ TA ≤ +125°C, 0 V ≤ VCM ≤ 5 V 1.7 mV

AD8652 0 V ≤ VCM ≤ 5 V 90 300 V

–40°C ≤ TA ≤ +125°C, 0 V ≤ VCM ≤ 5 V 0.4 1.4 mV

Offset Voltage Drift TCV

Input Bias Current I
–40°C ≤ TA ≤ +85°C 30 pA
–40°C ≤ TA ≤ +125°C 600 pA

Input Offset Current I
–40°C ≤ TA ≤ +85°C 30 pA
–40°C ≤ TA ≤ +125°C 600 pA

Input Voltage Range V

Common-Mode Rejection Ratio CMRR

AD8651 0.1 V < VCM < 5.1 V 80 95 dB
–40°C ≤ TA ≤ +85°C, 0.1 V < VCM < 5.1 V 75 94 dB
–40°C ≤ TA ≤ +125°C, 0.1 V < VCM < 5.1 V 70 90 dB

AD8652 0.1 V < VCM < 5.1 V 84 100 dB
–40°C ≤ TA ≤ +125°C, 0.1 V < VCM < 5.1 V 76 95 dB

Large Signal Voltage Gain A
R
R
OUTPUT CHARACTERISTICS

Output Voltage High V

Output Voltage Low V

Short-Circuit Limit I
Sinking 80 mA

Output Current I
POWER SUPPLY

Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.5 V, V
–40°C ≤ TA ≤ +125°C 74 93 dB

Supply Current I

AD8651 IO = 0 9.5 14.0 mA

–40°C ≤ TA ≤ +125°C 15 mA

AD8652 IO = 0 17.5 20.0 mA
–40°C ≤ TA ≤ +125°C 23.5 mA
INPUT CAPACITANCE C

Differential 6 pF
Common Mode 9 pF

DYNAMIC PERFORMANCE

Slew Rate SR G = 1, RL = 10 kΩ 41 V/µs
Gain Bandwidth Product GBP G = 1 50 MHz
Settling Time, 0.01% G = ±1, 2 V step 0.2 s
Overload Recovery Time VIN × G = 1.2 V
Total Harmonic Distortion + Noise THD + N G = 1, RL = 600 Ω, f = 1 kHz, VIN = 2 V p-p 0.0006 %

NOISE PERFORMANCE

Voltage Noise Density e

f = 100 kHz 4.5 nV/√Hz

Current Noise Density i

OS

OS

B

OS

CM

VO

OH

OL

SC

O

SY

IN

n

n

4 V/°C
1 10 pA

1 10 pA

–0.1 +5.1 V

RL = 1 kΩ, 200 mV < VO < 4.8 V 100 115 dB

= 1 kΩ, 200 mV < VO < 4.8 V, TA = 85°C 98 114 dB

L

= 1 kΩ, 200 mV < VO < 4.8 V, TA = 125°C 95 111 dB

L

IL = 250 µA, –40°C ≤ TA ≤ +125°C 4.97 V
IL = 250 µA, –40°C ≤ TA ≤ +125°C 30 mV
Sourcing 80 mA

40 mA

= 0 V 76 94 dB

CM

+

f = 10 kHz 5 nV/√Hz

f = 10 kHz 4 fA/√Hz

0.1 s

Rev. C | Page 4 of 20

AD8651/AD8652

www.BDTIC.com/ADI

ABSOLUTE MAXIMUM RATINGS

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

Table 3.

Parameter Rating

Supply Voltage 6.0 V

Input Voltage GND to V

Differential Input Voltage ±6.0 V

Output Short-Circuit Duration to GND Indefinite

Electrostatic Discharge (HBM) 4000 V

Storage Temperature Range

RM, R Package −65°C to +150°C
Operating Temperature Range −40°C to +125°C
Junction Temperature Range

RM, R Package −65°C to +150°C
Lead Temperature (Soldering, 10 sec) 300°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.

+ 0.3 V

S

THERMAL RESISTANCE

JA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.

Table 4. Thermal Resistance

Package Type θ

8-Lead MSOP (RM) 210 45 °C/W
8-Lead SOIC_N (R) 158 43 °C/W

JA

θ

JC

Unit

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.

Rev. C | Page 5 of 20

AD8651/AD8652

www.BDTIC.com/ADI

TYPICAL PERFORMANCE CHARACTERISTICS

60

50

VS = ±2.5V
V

= 0V

CM

100

VS = 5V

80

NUMBER OF AMPLIF IERS

(µV)

OS

V

–100

–200

300

200

100

40

30

20

10

0

–200

–160

–120

–80

–40

VOS (µV)

0

Figure 5. Input Offset Voltage Distribution

VS = ±2.5V
V

= 0V

CM

0

60

40

(µV)

OS

V

20

0

–20

40

80

120

160

200

03301-005

0123456

COMMON-MODE VOLTAGE (V)

3301-008

Figure 8. Input Offset Voltage vs. Common-Mode Voltage

500

VS = ±2.5V

400

300

200

INPUT BIAS CURRENT (pA)

100

–300

–50 0 50 100 150

TEMPERATURE (°C)

Figure 6. Input Offset Voltage vs. Temperature

60

50

40

30

20

NUMBER OF AMPLIFI ERS

10

0

01234567891011

TCVOS(µV/°C)

Figure 7. TCV

OS

VS= ±2.5V
V
T

Distribution

=0V

CM

: –40°C TO +125°C

A

0

3301-006

040 120100806020

TEMPERATURE (°C)

140

3301-009

Figure 9. Input Bias Current vs. Temperature

10

8

6

4

SUPPLY CURRENT (mA)

2

0

02 5431

3301-007

SUPPLY VOLTAGE (V)

6

3301-010

Figure 10. Supply Current vs. Supply Voltage

Rev. C | Page 6 of 20