Analog Devices AD8651 2 b Datasheet

50 MHz, Precision, Low Distortion,

–

+

FEATURES

Bandwidth: 50 MHz @ 5 V
Low Noise: 4.5 nV/√
Offset voltage: 100 µV typ, specified over

entire common-mode range
41 V/µs slew rate
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 packaging

APPLICATIONS

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

Hz

Low Noise CMOS Amplifiers

1

NC

AD8651

IN

2

TOP VIEW

IN

3

(Not to Scale)

4

V–

NC = NO CONNECT

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

NC

1

AD8651

–IN

2

+IN

3

TOP VIEW

(Not to Scale)

V–

4

NC = NO CONNECT

Figure 3. 8-Lead SOIC (R-8)

PIN CONFIGURATIONS

8
7
6
5

8
7
6
5

NC
V+
OUT
NC

NC
V+
OUT
NC

AD8651/AD8652

OUT A

03301-0-001

03301-0-002

1

V–

AD8652

2

TOP VIEW

3

(Not to Scale)

4

–IN A
+IN A

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

OUT A

1

V–

AD8652

2
3

TOP VIEW

(Not to Scale)

4

–IN A
+IN A

Figure 4. 8-Lead SOIC (R-8)

V+

8

OUT B

7
6

–IN B

5

+IN B

V+

8

OUT B

7

–IN B

6

+IN B

5

03301-B-003

03301-B-004

GENERAL DESCRIPTION

The AD8651 is a high precision, low noise, low distortion, rail­to-rail CMOS operational amplifier that runs from a single­supply voltage of 2.7 V to 5 V.

The AD8651 is a rail-to-rail input and output amplifier with a
gain bandwidth of 50 MHz and a typical voltage offset of
100 µV across common mode from a 5 V supply. It also features

Hz

low noise—4.5 nV/√

The AD8651 can be used in communications applications, such
as cell phone transmission power control, fiber optic
networking, wireless networking, and video line drivers.

Rev. B

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.

.

The AD8651 features the newest generation of DigiTrim®
in-package trimming. This new generation measures and
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 AD8651 is offered in the 8-lead SOIC package and the
8-lead MSOP package. It is specified over the extended indus­trial temperature range (−40°C to +125°C).

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
Fax: [phone] © 2004 Analog Devices, Inc. All rights reserved.

www.analog.com

AD8651/AD8652

TABLE OF CONTENTS

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

Layout, Grounding, and Bypassing considerations............... 15

Electrical Characteristics................................................................. 4

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

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

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

REVISION HISTORY

9/04—Data Sheet Changed from Rev. A to Rev. B

Added AD8652 ....................................................................Universal

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

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

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

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

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

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

Input Capacitance .................................................................. 15

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

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

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

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

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

Ordering Guide .......................................................................... 18

6/04—Changed from REV. 0 to REV. A

Change 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. B | Page 2 of 20

AD8651/AD8652

ELECTRICAL CHARACTERISTICS

Table 1. V+ = 2.7 V, V– = 0 V, VCM = V+/2, TA = 25°C, unless otherwise specified

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage V

OS

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

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

Offset Voltage Drift 4 μV/°C
Input Bias Current I

B

–40°C ≤ TA ≤ +125°C 600 pA

Input Offset Current I

OS

–40°C ≤ TA ≤ +85°C 30 pA
–40°C ≤ TA ≤ +125°C 600 pA

Input Voltage Range V

CM

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

VO

R
R
OUTPUT CHARACTERISTICS

Output Voltage High V
Output Voltage Low V
Short Circuit Limit I

OH

OL

SC

Sinking 80 mA

Output Current I

O

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

SY

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

IN

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 μs
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

n

f = 100 kHz 4.5

Current Noise Density i

n

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

+40 mA

+

f = 10 kHz 5

f = 10 kHz 4

0.1 μs

Hz

nV/√

Hz

nV/√

Hz

fA/√

Rev. B | Page 3 of 20

AD8651/AD8652

ELECTRICAL CHARACTERISTICS

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

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage V

OS

AD8651 0 ≤ VCM ≤ 5 V 100 350 μV

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

AD8652 0 ≤ VCM ≤ 5 V 90 300 μV

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

Offset Voltage Drift 4 μV/°C
Input Bias Current I

B

–40°C ≤ TA ≤ +85°C 30 pA
–40°C ≤ TA ≤ +125°C 600 pA

Input Offset Current I

OS

–40°C ≤ TA ≤ +85°C 30 pA
–40°C ≤ TA ≤ +125°C 600 pA

Input Voltage Range V

CM

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

VO

R
R
OUTPUT CHARACTERISTICS

Output Voltage High V
Output Voltage Low V
Short Circuit Limit I

OH

OL

SC

Sinking 80 mA

Output Current I

O

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

SY

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

IN

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 μs
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

n

f = 100 kHz 4.5

Current Noise Density I

n

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

f = 10 kHz 4

0.1 μs

Hz

nV/√

Hz

nV/√

Hz

fA/√

Rev. B | Page 4 of 20

AD8651/AD8652

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 VS + 0.3 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 s) 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.

Table 4.

Package Type θ

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

1

JA

θ

JC

Unit

1

θJA is specified for the worst-case conditions, i.e., θJA is specified for device

soldered in circuit board for surface-mount packages.

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. B | Page 5 of 20

AD8651/AD8652

TYPICAL PERFORMANCE CHARACTERISTICS

60

50

VS = ±2.5V
V

= 0V

CM

100

VS = 5V

80

(µV)
V

NUMBER OF AMPLIFIERS

OS

300

200

100

–100

–200

40

30

20

10

0

–200

–160

–120

–80

–40

VOS (µV)

0

Figure 5. Input Offset Voltage Distribution

VS = ±2.5V

= 0V

V

CM

0

60

40

(µV)

OS

V

20

0

–20

40

80

120

160

200

03301-B-005

0123456

COMMON-MODE VOLTAGE (V)

03301-B-008

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

500

VS = ±2.5V

400

300

200

INPUT BAIS 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 AMPLIFIERS

10

0

01234567891011

TCVOS (µV/°C)

Figure 7. TCV

Distribution

OS

VS = ±2.5V
V

= 0V

CM

T: –40°C TO 125°C

0

03301-B-006

0 40 140120100806020

TEMPERATURE (°C)

03301-B-009

Figure 9. Input Bias Current vs. Temperature

10

8

6

4

SUPPLY CURRENT (mA)

2

0

03301-B-007

02 5431 6

SUPPLY VOLTAGE (V)

03301-B-010

Figure 10. Supply Current vs. Supply Voltage

Rev. B | Page 6 of 20