Data Sheet
FEATURES
Low Distortion, High Speed
Rail-to-Rail Input/Output Amplifiers
AD8027/AD8028
PIN CONNECTION DIAGRAM
DNC
1
–IN
2
+IN
3
–V
S 4
High speed
190 MHz, −3 dB bandwidth (G = +1)
100 V/µs slew rate
Low distortion
120 dBc at 1 MHz SFDR
80 dBc at 5 MHz SFDR
Selectable input crossover threshold
Low noise
4.3 nV/√Hz
1.6 pA/√Hz
Low offset voltage: 900 µV maximum
Low power: 6.5 mA per 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: 8-lead SOIC, 6-lead SOT-23, 10-lead MSOP
Qualified for automotive applications (AD8028WARMZ-R7 only)
AD8027
8
7
6
5
DISABLE/SELECT
+V
S
V
OUT
DNC
03327-101
DNC = DO NOT CONNECT. DO NOT
CONNECT TO THIS PIN.
Figure 1. 8-Lead SOIC,
AD8027
See the Pin Configurations and Function Descriptions section
for additional pin configurations and information about the pin
functions.
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 (typical) per amplifier. The
AD8027/
AD8028
have a shutdown mode that is controlled via
the DISABLE/SELECT pin.
The
AD8027/AD8028
are available in 8-lead SOIC, 6-lead SOT-23,
and 10-lead MSOP packages. The
AD8028WARMZ-R7
is an
automotive grade version, qualified for automotive applications.
See the Automotive Products section for more details. The
AD8027/AD8028
family is designed to work over the extended
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 a 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 applications that use a
fraction of or use 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 DISABLE/SELECT pin
(DISABLE/SELECT x in the 10-lead MSOP, hereafter referred
to as DISABLE/SELECT throughout this data sheet). This feature
controls the voltage at which the complementary transistor
input pairs switch. The
AD8027/AD8028
also have intrinsically
low crossover distortion.
1
–40
–60
SFDR (dB)
V
S
= +3V
–80
V
S
= +5V
V
S
=
±5V
–100
–120
0
1
2
3
4
5
6
7
OUTPUT VOLTAGE (V p-p)
8
9
10
Protected by U.S. patent numbers 6,486,737B1; 6,518,842B1.
Document Feedback
Figure 2. SFDR vs. Output Voltage
Rev. D
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: 781.329.4700 ©2003–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
03327-063
–140
AD8027/AD8028
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Pin Connection Diagram ................................................................ 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings ............................................................ 7
Maximum Power Dissipation ..................................................... 7
ESD Caution .................................................................................. 7
Pin Configuration and Function Descriptions ............................. 8
Typical Performance Characteristics ........................................... 10
Test Circuit ...................................................................................... 19
Theory of Operation ...................................................................... 20
Input Stage ................................................................................... 20
Data Sheet
Crossover Selection .................................................................... 20
Output Stage................................................................................ 21
DC Errors .................................................................................... 21
Wideband Operation ..................................................................... 22
Circuit Considerations .............................................................. 22
Applications Information .............................................................. 24
Using the DISABLE/SELECT Pin ............................................ 24
Driving a 16-Bit ADC ................................................................ 24
Band-Pass Filter .......................................................................... 25
Design Tools and Technical Support ....................................... 25
Outline Dimensions ....................................................................... 26
Ordering Guide .......................................................................... 27
Automotive Products ................................................................. 27
REVISION HISTORY
7/15—Rev. C to Rev. D
Changed SELECT to DISABLE/SELECT, NC to DNC, V
S+
to
+V
S
, and V
S−
to −V
S
....................................................... Throughout
Changes to Features Section, Figure 1, and General Description
Section ................................................................................................ 1
Changes to Table 1 ............................................................................ 3
Changes to Table 2 ............................................................................ 4
Changes to Table 3 ............................................................................ 5
Added Pin Configurations and Function Descriptions Section 8
Added Figure 4, Figure 5, Table 5, and Table 6; Renumbered
Sequentially ....................................................................................... 8
Added Figure 6, Figure 7, Table 7, and Table 8............................. 9
Changes to Figure 10 Caption and Figure 13 Caption .............. 10
Changes to Figure 16 Caption and Figure 19 Caption .............. 11
Changes to Figure 20 Caption and Figure 21 ............................. 12
Changes to Figure 26 Caption....................................................... 13
Changes to Figure 36 and Figure 37............................................. 14
Changes to Figure 42 ...................................................................... 15
Changes to Figure 50 Caption....................................................... 17
Added Test Circuit Section and Figure 59 .................................. 19
Changes to Theory of Operation Section .................................... 20
Changes to Crossover Selection Section and Figure 61 ............ 21
Changes to Wideband Operation Section, Figure 62, Figure 63,
and Figure 64 ................................................................................... 22
Changes to PCB Layout Section ................................................... 23
Changes to Using the DISABLE/SELECT Pin Section and
Table 6 .............................................................................................. 24
Changes to Figure 67 and Design Tools and Technical Support
Section .............................................................................................. 25
Updated Outline Dimensions ....................................................... 26
Changes to Ordering Guide .......................................................... 27
Added Automotive Products Section .......................................... 27
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 Figure 1, Figure 3, Figure 4, Figure 8, Figure 13,
Figure 15, Figure 17.......................................................... 1, 6, 7, 8, 9
Changes to Figure 58, Figure 60 ............................................. 18, 20
Changes to Specifications .................................................................3
Updated Outline Dimensions ....................................................... 22
Updated Ordering Guide .............................................................. 23
3/03—Revision 0: Initial Version
Rev. D | Page 2 of 27
Data Sheet
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
Test Conditions/Comments
G = +1, V
OUT
= 0.2 V p-p
AD8028W
only: T
MIN
to T
MAX
G = +1, V
OUT
= 2 V p-p
AD8028W
only: T
MIN
to T
MAX
G = +2, V
OUT
= 0.2 V p-p
G = +1, V
OUT
= 2 V step
G = −1, V
OUT
= 2 V step
G = +2, V
OUT
= 2 V step
f
C
= 1 MHz, V
OUT
= 2 V p-p, R
F
= 24.9 Ω
f
C
= 5 MHz, V
OUT
= 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 at 1 MHz
DISABLE/SELECT = tristate or open, PNP active
AD8028W
only: T
MIN
to T
MAX
DISABLE/SELECT = high, NPN active
AD8028W
only: T
MIN
to T
MAX
T
MIN
to T
MAX
V
CM
= 0 V, NPN active
T
MIN
to T
MAX
AD8028W
only: T
MIN
to T
MAX
V
CM
= 0 V, PNP active
T
MIN
to T
MAX
AD8028W
only: T
MIN
to T
MAX
AD8028W
only: T
MIN
to T
MAX
V
OUT
= ±2.5 V,
AD8028W
only: T
MIN
to T
MAX
Min
138
138
20
20
Typ
190
32
16
90
100
35
120
80
4.3
1.6
0.1
0.2
−93
200
240
1.50
4
4
−8
−8
±0.1
110
AD8027/AD8028
Max
Unit
MHz
MHz
MHz
MHz
MHz
V/µs
V/µs
ns
dBc
dBc
nV/√Hz
pA/√Hz
%
Degrees
dB
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
800
850
900
900
6
6
−11
−11
±0.9
Input Offset Voltage Drift
Input Bias Current
1
Input Offset Current
Open-Loop Gain
INPUT CHARACTERISTICS
Input Impedance
Input Capacitance
Input Common-Mode Voltage
Range
Common-Mode Rejection Ratio
DISABLE/SELECT PIN
Selection Input Voltage
Crossover Low
Crossover High
2
Disable Input Voltage
Disable Switching Speed
Enable Switching Speed
100
µV
µV
µV
µV
µV/°C
µA
µA
µA
µA
µA
µA
µA
dB
MΩ
pF
V
dB
dB
6
2
−5.2 to +5.2
V
CM
= ±2.5 V
AD8028W
only: T
MIN
to T
MAX
90
88
110
T
MIN
to T
MAX
Tristate < ±20 µA, T
MIN
to T
MAX
T
MIN
to T
MAX
50% of input to <10% of final V
OUT
−3.0
−3.9 to −3.7
−4.6
980
45
V
V
V
ns
ns
Rev. D | Page 3 of 27
AD8027/AD8028
Parameter
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 per Amplifier
Quiescent Current (Disabled)
Power Supply Rejection Ratio
1
2
Data Sheet
Test Conditions/Comments
V
IN
= +6 V to −6 V, G = −1
AD8028W
only: T
MIN
to T
MAX
Sinking and sourcing
V
IN
= 0.2 V p-p, f = 1 MHz, DISABLE/SELECT = low
30% overshoot
−4.9 to +4.9
Min
Typ
40/45
−4.94 to +4.94
120
−49
20
12
8.5
9.5
500
500
Max
Unit
ns
V
mA
dB
pF
V
mA
mA
µA
µA
dB
2.7
6.5
AD8028W
only: T
MIN
to T
MAX
DISABLE/SELECT = low
AD8028W
only: T
MIN
to T
MAX
V
S
± 1 V,
AD8028W
only: T
MIN
to T
MAX
370
90
110
No sign or a plus sign indicates current into the pin; a minus sign indicates current out of the pin.
It is recommended to float the DISABLE/SELECT pin for crossover high mode.
V
S
= 5 V at T
A
= 25°C, R
L
= 1 kΩ to midsupply, G = +1, unless otherwise noted.
Table 2.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Test Conditions/Comments
G = +1, V
OUT
= 0.2 V p-p
AD8028W
only: T
MIN
to T
MAX
G = +1, V
OUT
= 2 V p-p
AD8028W
only: T
MIN
to T
MAX
G = +2, V
OUT
= 0.2 V p-p
G = +1, V
OUT
= 2 V step
G = −1, V
OUT
= 2 V step
G = +2, V
OUT
= 2 V step
f
C
= 1 MHz, V
OUT
= 2 V p-p, R
F
= 24.9 Ω
f
C
= 5 MHz, V
OUT
= 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 at 1 MHz
DISABLE/SELECT = tristate or open, PNP active
AD8028W
only: T
MIN
to T
MAX
DISABLE/SELECT = high NPN active
AD8028W
only: T
MIN
to T
MAX
T
MIN
to T
MAX
V
CM
= 2.5 V, NPN active
T
MIN
to T
MAX
AD8028W
only: T
MIN
to T
MAX
V
CM
= 2.5 V, PNP active
T
MIN
to T
MAX
AD8028W
only: T
MIN
to T
MAX
AD8028W
only: T
MIN
to T
MAX
V
OUT
= 1 V to 4 V,
AD8028W
only: T
MIN
to T
MAX
Rev. D | Page 4 of 27
Min
131
131
18
18
Typ
185
28
12
85
100
40
90
64
4.3
1.6
0.1
0.2
−92
Max Unit
MHz
MHz
MHz
MHz
MHz
V/µs
V/µs
ns
dBc
dBc
nV/√Hz
pA/√Hz
%
Degrees
dB
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
200
240
2
4
4
−8
−8
±0.1
105
800
850
900
900
Input Offset Voltage Drift
Input Bias Current
1
Input Offset Current
Open-Loop Gain
96
µV
µV
µV
µV
µV/°C
6
µA
µA
6
µA
−11 µA
µA
−11 µA
±0.9 µA
dB
Data Sheet
Parameter
INPUT CHARACTERISTICS
Input Impedance
Input Capacitance
Input Common-Mode Voltage Range
Common-Mode Rejection Ratio
DISABLE/SELECT PIN
Selection Input Voltage
Crossover Low
Crossover High
2
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 per Amplifier
Quiescent Current (Disabled)
Power Supply Rejection Ratio
1
2
AD8027/AD8028
Test Conditions/Comments
Min
Typ
6
2
−0.2 to +5.2
105
Max Unit
MΩ
pF
V
dB
dB
V
CM
= 0 V to 2.5 V
AD8028W
only: T
MIN
to T
MAX
90
84
T
MIN
to T
MAX
Tristate < ±20 µA, T
MIN
to T
MAX
T
MIN
to T
MAX
50% of input to <10% of final V
OUT
2.0
1.1 to 1.3
0.4
1100
50
50/50
0.08 to 4.92
0.04 to 4.96
−49
105
20
12
8.5
9
450
450
V
V
V
ns
ns
ns
V
dB
mA
pF
V
mA
mA
µA
µA
dB
V
IN
= −6 V to +1 V, G = −1
AD8028W
only: T
MIN
to T
MAX
V
IN
= 0.2 V p-p, f = 1 MHz, DISABLE/SELECT = low
Sinking and sourcing
30% overshoot
2.7
6
AD8028W
only: T
MIN
to T
MAX
DISABLE/SELECT = low
AD8028W
only: T
MIN
to T
MAX
V
S
± 1 V,
AD8028W
only: T
MIN
to T
MAX
320
90
105
No sign or a plus sign indicates current into the pin; a minus sign indicates current out of the pin.
It is recommended to float the DISABLE/SELECT pin for crossover high mode.
V
S
=
3 V at T
A
= 25°C, R
L
= 1 kΩ to midsupply, G = +1, unless otherwise noted.
Table 3.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Test Conditions/Comments
G = +1, V
OUT
= 0.2 V p-p
AD8028W
only: T
MIN
to T
MAX
G = +1, V
OUT
= 2 V p-p
AD8028W
only: T
MIN
to T
MAX
G = +2, V
OUT
= 0.2 V p-p
G = +1, V
OUT
= 2 V step
G = −1, V
OUT
= 2 V step
G = +2, V
OUT
= 2 V step
f
C
= 1 MHz, V
OUT
= 2 V p-p, R
F
= 24.9 Ω
f
C
= 5 MHz, V
OUT
= 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
= 3 V at
1 MHz
Rev. D | Page 5 of 27
Min
125
125
19
19
Typ
180
29
10
73
100
48
85
64
4.3
1.6
0.15
0.20
−89
Max
Unit
MHz
MHz
MHz
MHz
MHz
V/µs
V/µs
ns
dBc
dBc
nV/√Hz
pA/√Hz
%
Degrees
dB
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
RF/Wirelessly
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