Low Distortion, High Speed
Rail-to-Rail Input/Output Amplifiers
AD8027/AD8028
FEATURES
High speed
190 MHz, –3 dB bandwidth (G = +1)
100 V/μs slew rate
Low distortion
120 dBc @ 1 MHz SFDR
80 dBc @ 5 MHz SFDR
Selectable input crossover threshold
Low noise
4.3 nV/√Hz
1.6 pA/√Hz
Low offset voltage: 900 μV max
Low power: 6.5 mA/amplifier supply current
Power-down mode
No phase reversal: V
IN
> |V
S
| + 200 mV
Wide supply range: 2.7 V to 12 V
Small packaging: SOIC-8, SOT-23-6, MSOP-10
AD8027
SOIC-8
(R)
NC
1
–IN
2
+IN
3
–V
S 4
8
7
6
5
CONNECTION DIAGRAMS
AD8027
SOT-23-6
(RT)
DISABLE/SELECT
+V
S
V
OUT
NC
+IN
3
4
V
OUT 1
–V
S 2
6
+V
S
DISABLE/SELECT
+
–
5
NC = NO CONNECT
–IN
AD8028
SOIC-8
(R)
V
OUTA 1
–IN A
2
+IN A
3
–V
S 4
–
+
–
+
8
7
6
5
AD8028
MSOP-10
(RM)
+V
S
V
OUTB
–IN B
+IN B
V
OUTA 1
–IN A
2
+IN A
3
–V
S 4
DISABLE/SELECT A
5
03327-B-001
10
+V
S
–
+
–
+
9
8
7
6
V
OUTB
–IN B
+IN B
DISABLE/SELECT B
Figure 1. Connection Diagrams (Top View)
APPLICATIONS
Filters
ADC drivers
Level shifting
Buffering
Professional video
Low voltage instrumentation
With their wide supply voltage range (2.7 V to 12 V) and wide
bandwidth (190 MHz), the AD8027/AD8028 amplifiers are
designed to work in a variety of applications where speed and
performance are needed on low supply voltages. The high per-
formance of the AD8027/AD8028 is achieved with a quiescent
current of only 6.5 mA/amplifier typical. The AD8027/AD8028
have a shutdown mode that is controlled via the SELECT pin.
The AD8027/AD8028 are available in SOIC-8, MSOP-10, and
SOT-23-6 packages. They are rated to work over the industrial
temperature range of –40°C to +125°C.
–20
G = +1
FREQUENCY = 100kHz
R
L
= 1kΩ
GENERAL DESCRIPTION
The AD8027/AD8028
1
are high speed amplifiers with rail-to-
rail input and output that operate on low supply voltages and
are optimized for high performance and wide dynamic signal
range. The AD8027/AD8028 have low noise (4.3 nV/√Hz,
1.6 pA/√Hz) and low distortion (120 dBc at 1 MHz). In appli-
cations that use a fraction of, or the entire input dynamic range
and require low distortion, the AD8027/AD8028 are ideal
choices.
Many rail-to-rail input amplifiers have an input stage that
switches from one differential pair to another as the input signal
crosses a threshold voltage, which causes distortion. The
AD8027/AD8028 have a unique feature that allows the user to
select the input crossover threshold voltage through the
SELECT pin. This feature controls the voltage at which the
complementary transistor input pairs switch. The AD8027/
AD8028 also have intrinsically low crossover distortion.
–40
–60
V
S
= +3V
SFDR (dB)
V
S
= +5V
V
S
=
±5V
–80
–100
–120
–140
0
1
2
3
4
5
6
7
OUTPUT VOLTAGE (V p-p)
8
9
10
03327-A-063
Figure 2. SFDR vs. Output Amplitude
1
Protected by U.S. patent numbers 6,486,737B1; 6,518,842B1
Rev. C
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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
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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
Fax: 781.461.3113
© 2005 Analog Devices, Inc. All rights reserved.
IMPORTANT LINKS for the
AD8027_8028*
Last content update 08/18/2013 09:13 pm
DOCUMENTATION
AN-649:
Using the Analog Devices Active Filter Design Tool
AN-581:
Biasing and Decoupling Op Amps in Single Supply
Applications
AN-402:
Replacing Output Clamping Op Amps with Input Clamping
Amps
AN-417:
Fast Rail-to-Rail Operational Amplifiers Ease Design
Constraints in Low Voltage High Speed Systems
MT-060:
Choosing Between Voltage Feedback and Current Feedback
Op Amps
MT-059:
Compensating for the Effects of Input Capacitance on VFB
and CFB Op Amps Used in Current-to-Voltage Converters
MT-058:
Effects of Feedback Capacitance on VFB and CFB Op Amps
MT-056:
High Speed Voltage Feedback Op Amps
MT-053:
Op Amp Distortion: HD, THD, THD + N, IMD, SFDR, MTPR
MT-052:
Op Amp Noise Figure: Don’t Be Mislead
MT-050:
Op Amp Total Output Noise Calculations for Second-Order
System
MT-049:
Op Amp Total Output Noise Calculations for Single-Pole
System
MT-047:
Op Amp Noise
MT-033:
Voltage Feedback Op Amp Gain and Bandwidth
MT-032:
Ideal Voltage Feedback (VFB) Op Amp
A Stress-Free Method for Choosing High-Speed Op Amps
FOR THE AD8027
UG-127:
Universal Evaluation Board for High Speed Op Amps in
SOT-23-5/SOT-23-6 Packages
UG-101:
Evaluation Board User Guide
Op Amps Increasingly Swing Rail-to-Rail
Low-Cost Video Multiplexing Using High-Speed Amplifiers
FOR THE AD8028
AD8028-KGD-CHIP: Low Distortion, High Speed Rail-to-Rail
Input/Output Amplifier Data Sheet
UG-128:
Universal Evaluation Board for Dual High Speed Op Amps in
SOIC Packages
PARAMETRIC SELECTION TABLES
Find Similar Products By Operating Parameters for the AD8027
Find Similar Products By Operating Parameters for the AD8028
High Speed Amplifiers Selection Table
EVALUATION KITS & SYMBOLS & FOOTPRINTS
View the Evaluation Boards and Kits page for the AD8027
View the Evaluation Boards and Kits page for the AD8028
Symbols and Footprints for the AD8027
Symbols and Footprints for the AD8028
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Quality and Reliability
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DESIGN TOOLS, MODELS, DRIVERS & SOFTWARE
dBm/dBu/dBv Calculator
Power Dissipation vs Die Temp
Analog Filter Wizard 2.0
ADIsimOpAmp™
OpAmp Stability
AD8027 SPICE Macro-Model
AD8028 SPICE Macro-Model
SAMPLE & BUY
AD8027
AD8028
View Price & Packaging
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AD8027/AD8028
TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 6
Maximum Power Dissipation ..................................................... 6
ESD Caution.................................................................................. 6
Typical Performance Characteristics ............................................. 8
Theory of Operation ...................................................................... 17
Input Stage................................................................................... 17
Crossover Selection .................................................................... 17
Output Stage................................................................................ 18
DC Errors .................................................................................... 18
Wideband Operation ..................................................................... 19
Circuit Considerations .............................................................. 19
Applications..................................................................................... 21
Using the SELECT Pin............................................................... 21
Driving a 16-Bit ADC................................................................ 21
Band-Pass Filter.......................................................................... 22
Design Tools and Technical Support ....................................... 22
Outline Dimensions ....................................................................... 23
Ordering Guide .......................................................................... 24
REVISION HISTORY
3/05—Rev. B to Rev. C
Updated Format..................................................................Universal
Change to Figure 1 ........................................................................... 1
10/03—Rev. A to Rev. B
Changes to Figure 1...........................................................................1
8/03—Rev. 0 to Rev. A
Addition of AD8028........................................................... Universal
Changes to GENERAL DESCRIPTION.........................................1
Changes to Figures 1, 3, 4, 8, 13, 15, 17 ......................... 1, 6, 7, 8, 9
Changes to Figures 58, 60........................................................ 18, 20
Changes to SPECIFICATIONS........................................................3
Updated OUTLINE DIMENSIONS .............................................22
Updated ORDERING GUIDE.......................................................23
3/03—Revision 0: Initial Version
Rev. C | Page 2 of 24
AD8027/AD8028
SPECIFICATIONS
V
S
= ±5 V at T
A
= 25°C, R
L
= 1 kΩ to midsupply, G = 1, unless otherwise noted.
Table 1.
Parameter
DYNAMIC PERFORMANCE
–3 dB Bandwidth
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
NOISE/DISTORTION PERFORMANCE
Spurious-Free Dynamic Range (SFDR)
Input Voltage Noise
Input Current Noise
Differential Gain Error
Differential Phase Error
Crosstalk, Output to Output
DC PERFORMANCE
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
1
Conditions
G = 1, V
O
= 0.2 V p-p
G = 1, V
O
= 2 V p-p
G = 2, V
O
= 0.2 V p-p
G = +1, V
O
= 2 V step/G = −1, V
O
= 2 V step
G = 2, V
O
= 2 V step
f
C
= 1 MHz, V
O
= 2 V p-p, R
F
= 24.9 Ω
f
C
= 5 MHz, V
O
= 2 V p-p, R
F
= 24.9 Ω
f = 100 kHz
f = 100 kHz
NTSC, G = 2, R
L
= 150 Ω
NTSC, G = 2, R
L
= 150 Ω
G = 1, R
L
= 100 Ω, V
OUT
= 2 V p-p,
V
S
= ±5 V @ 1 MHz
SELECT = three-state or open, PNP active
SELECT = high NPN active
T
MIN
to T
MAX
V
CM
= 0 V, NPN active
T
MIN
to T
MAX
V
CM
= 0 V, PNP active
T
MIN
to T
MAX
V
O
= ±2.5 V
100
Min
138
20
Typ
190
32
16
90/100
35
120
80
4.3
1.6
0.1
0.2
−93
Max
Unit
MHz
MHz
MHz
V/μs
ns
dBc
dBc
nV/√Hz
pA/√Hz
%
Degrees
dB
Input Offset Current
Open-Loop Gain
INPUT CHARACTERISTICS
Input Impedance
Input Capacitance
Input Common-Mode Voltage Range
Common-Mode Rejection Ratio
SELECT PIN
Crossover Low, Selection Input Voltage
Crossover High, Selection Input Voltage
Disable Input Voltage
Disable Switching Speed
Enable Switching Speed
OUTPUT CHARACTERISTICS
Output Overdrive Recovery Time
(Rising/Falling Edge)
Output Voltage Swing
Short-Circuit Output
Off Isolation
Capacitive Load Drive
POWER SUPPLY
Operating Range
Quiescent Current/Amplifier
Quiescent Current (Disabled)
Power Supply Rejection Ratio
200
240
1.50
4
4
−8
−8
±0.1
110
6
2
−5.2 to +5.2
110
−3.3 to +5
−3.9 to −3.3
−5 to −3.9
980
45
40/45
800
900
6
−11
±0.9
μV
μV
μV/°C
μA
μA
μA
μA
μA
dB
MΩ
pF
V
dB
V
V
V
ns
ns
ns
V
CM
= ±2.5 V
Three-state < ±20 μA
90
50% of input to <10% of final V
O
V
I
= +6 V to −6 V, G = −1
−V
S
+ 0.10
Sinking and Sourcing
V
IN
= 0.2 V p-p, f = 1 MHz, SELECT = low
30% overshoot
2.7
SELECT = low
V
S
± 1 V
+V
S
− 0.06,
−V
S
+ 0.06
120
−49
20
+V
S
− 0.10
V
mA
dB
pF
90
6.5
370
110
12
8.5
500
V
mA
μA
dB
1
No sign or a plus sign indicates current into the pin; a minus sign indicates current out of the pin.
Rev. C | Page 3 of 24
AD8027/AD8028
V
S
= 5 V at T
A
= 25°C, R
L
= 1 kΩ to midsupply, unless otherwise noted.
Table 2.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
NOISE/DISTORTION PERFORMANCE
Spurious-Free Dynamic Range (SFDR)
Input Voltage Noise
Input Current Noise
Differential Gain Error
Differential Phase Error
Crosstalk, Output to Output
DC PERFORMANCE
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
1
Conditions
G = 1, V
O
= 0.2 V p-p
G = 1, V
O
= 2 V p-p
G = 2, V
O
= 0.2 V p-p
G = +1, V
O
= 2 V step/G = −1, V
O
= 2 V step
G = 2, V
O
= 2 V step
f
C
= 1 MHz, V
O
= 2 V p-p, R
F
= 24.9 Ω
f
C
= 5 MHz, V
O
= 2 V p-p, R
F
= 24.9 Ω
f = 100 kHz
f = 100 kHz
NTSC, G = 2, R
L
= 150 Ω
NTSC, G = 2, R
L
= 150 Ω
G = 1, R
L
= 100 Ω, V
OUT
= 2 V p-p,
V
S
= ±5 V @ 1 MHz
SELECT = three-state or open, PNP active
SELECT = high NPN active
T
MIN
to T
MAX
V
CM
= 2.5 V, NPN active
T
MIN
to T
MAX
V
CM
= 2.5 V, PNP active
T
MIN
to T
MAX
V
O
= 1 V to 4 V
96
Min
131
18
Typ
185
28
12
85/100
40
90
64
4.3
1.6
0.1
0.2
−92
Max
Unit
MHz
MHz
MHz
V/μs
ns
dBc
dBc
nV/√Hz
pA/√Hz
%
Degrees
dB
Input Offset Current
Open-Loop Gain
INPUT CHARACTERISTICS
Input Impedance
Input Capacitance
Input Common-Mode Voltage Range
Common-Mode Rejection Ratio
SELECT PIN
Crossover Low, Selection Input Voltage
Crossover High, Selection Input Voltage
Disable Input Voltage
Disable Switching Speed
Enable Switching Speed
OUTPUT CHARACTERISTICS
Overdrive Recovery Time
(Rising/Falling Edge)
Output Voltage Swing
Off Isolation
Short-Circuit Current
Capacitive Load Drive
POWER SUPPLY
Operating Range
Quiescent Current/Amplifier
Quiescent Current (Disabled)
Power Supply Rejection Ratio
200
240
2
4
4
−8
−8
±0.1
105
6
2
−0.2 to +5.2
105
1.7 to 5
1.1 to 1.7
0 to 1.1
1100
50
50/50
800
900
6
−11
±0.9
μV
μV
μV/°C
μA
μA
μA
μA
μA
dB
MΩ
pF
V
dB
V
V
V
ns
ns
ns
V
CM
= 0 V to 2.5 V
Three-state < ±20 μA
90
50% of input to <10% of final V
O
V
I
= −1 V to +6 V, G = −1
R
L
= 1 kΩ
V
IN
= 0.2 V p-p, f = 1 MHz, SELECT = low
Sinking and sourcing
30% overshoot
2.7
SELECT = low
V
S
± 1 V
−V
S
+ 0.08
+V
S
− 0.04,
−V
S
+ 0.04
−49
105
20
+V
S
− 0.08
V
dB
mA
pF
90
6
320
105
12
8.5
450
V
mA
μA
dB
1
No sign or a plus sign indicates current into the pin; a minus sign indicates current out of the pin.
Rev. C | Page 4 of 24
Embedded System
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