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Precision, 20 MHz, CMOS, Rail-to-Rail
Input/Output Operational Amplifiers
AD8615/AD8616/AD8618
FEATURES
Low offset voltage: 65 μV maximum
Single-supply operation: 2.7 V to 5.0 V
Low noise: 8 nV/√Hz
Wide bandwidth: >20 MHz
Slew rate: 12 V/μs
High output current: 150 mA
No phase reversal
Low input bias current: 1 pA
Low supply current: 2 mA
Unity-gain stable
PIN CONFIGURATIONS
OUT
1
5
V+
AD8615
V–
2
+IN
3
4
–IN
Figure 1. 5-Lead TSOT-23 (UJ-5)
OUT A
–IN A
+IN A
1
2
3
8
V+
OUT B
+IN B
04648-002
04648-005
AD8616
7
6
5
TOP VIEW
(Not to Scale)
V–
4
–IN B
APPLICATIONS
Barcode scanners
Battery-powered instrumentation
Multipole filters
Sensors
ASIC input or output amplifiers
Audio
Photodiode amplification
Figure 2. 8-Lead MSOP (RM-8)
OUT A
–IN A
+IN A
1
2
3
8
V+
OUT B
+IN B
04648-003
04648-004
AD8616
7
6
5
TOP VIEW
(Not to Scale)
V–
4
–IN B
Figure 3. 8-Lead SOIC (R-8)
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
1
14
GENERAL DESCRIPTION
The AD8615/AD8616/AD8618 are single/dual/quad, rail-to-
rail, input and output, single-supply amplifiers featuring very
low offset voltage, wide signal bandwidth, and low input voltage
and current noise. The parts use a patented trimming technique
that achieves superior precision without laser trimming. The
AD8615/AD8616/ AD8618 are fully specified to operate from
2.7 V to 5 V single supplies.
The combination of >20 MHz bandwidth, low offset, low noise,
and low input bias current makes these amplifiers useful in a
wide variety of applications. Filters, integrators, photodiode
amplifiers, and high impedance sensors all benefit from the
combination of performance features. AC applications benefit from
the wide bandwidth and low distortion. The AD8615/AD8616/
AD8618 offer the highest output drive capability of the DigiTrim®
family, which is excellent for audio line drivers and other low
impedance applications.
Applications for the parts include portable and low powered
instrumentation, audio amplification for portable devices,
portable phone headsets, bar code scanners, and multipole
filters. 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 single-supply systems.
Rev. E
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.
AD8618
TOP VIEW
(Not to Scale)
7
8
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
Figure 4. 14-Lead TSSOP (RU-14)
OUT A
1
–IN A
2
+IN A
3
V+
4
14
13
OUT D
–IN D
+IN D
V–
TOP VIEW
(Not to Scale)
10
+IN C
+IN B
5
11
AD8618
12
–IN B
6
9
8
–IN C
OUT C
OUT B
7
Figure 5. 14-Lead SOIC (R-14)
The AD8615/AD8616/AD8618 are specified over the extended
industrial temperature range (−40°C to +125°C). The AD8615
is available in 5-lead TSOT-23 package. The AD8616 is available
in 8-lead MSOP and narrow SOIC surface-mount packages; the
MSOP version is available in tape and reel only. The AD8618 is
available in 14-lead SOIC and TSSOP packages.
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 ©2004–2008 Analog Devices, Inc. All rights reserved.
04648-001
TOP VIEW
(Not to Scale)
AD8615/AD8616/AD8618
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Typical Performance Characteristics ............................................. 6
Applications Information .............................................................. 11
Input Overvoltage Protection ................................................... 11
Output Phase Reversal ............................................................... 11
Driving Capacitive Loads .......................................................... 11
Overload Recovery Time .......................................................... 12
D/A Conversion ......................................................................... 12
Low Noise Applications ............................................................. 12
High Speed Photodiode Preamplifier ...................................... 13
Active Filters ............................................................................... 13
Power Dissipation....................................................................... 13
Power Calculations for Varying or Unknown Loads............. 14
Outline Dimensions ....................................................................... 15
Ordering Guide .......................................................................... 17
REVISION HISTORY
9/08—Rev. D to Rev. E
Changes to General Description Section ...................................... 1
Updated Outline Dimensions ....................................................... 15
Changes to Ordering Guide .......................................................... 17
5/08—Rev. C to Rev. D
Changes to Layout ............................................................................ 1
Changes to Figure 38 ...................................................................... 11
Changes to Figure 44 and Figure 45 ............................................. 13
Changes to Layout .......................................................................... 15
Changes to Layout .......................................................................... 16
6/05—Rev. B to Rev. C
Change to Table 1 ............................................................................. 3
Change to Table 2 ............................................................................. 4
Change to Figure 20 ......................................................................... 8
1/05—Rev. A to Rev. B
Added AD8615 ................................................................... Universal
Changes to Figure 12 ........................................................................ 8
Deleted Figure 19; Renumbered Subsequently ............................. 8
Changes to Figure 20 ........................................................................ 9
Changes to Figure 29 ...................................................................... 10
Changes to Figure 31 ...................................................................... 11
Deleted Figure 34; Renumbered Subsequently ........................... 11
Deleted Figure 35; Renumbered Subsequently ........................... 35
4/04—Rev. 0 to Rev. A
Added AD8618 ................................................................... Universal
Updated Outline Dimensions ....................................................... 16
1/04—Revision 0: Initial Version
Rev. E | Page 2 of 20
AD8615/AD8616/AD8618
SPECIFICATIONS
V
S
=5 V, V
CM
= V
S
/2, T
A
= 25°C, unless otherwise noted.
Table 1.
Parameter
INPUT CHARACTERISTICS
Offset Voltage, AD8616/AD8618
Offset Voltage, AD8615
Symbol
V
OS
Conditions
V
S
= 3.5 V at V
CM
= 0.5 V and 3.0 V
V
CM
= 0 V to 5 V
−40°C < T
A
< +125°C
−40°C < T
A
< +125°C
Min
Typ
23
23
80
1.5
3
0.2
Max
60
100
500
800
7
10
1
50
550
0.5
50
250
5
Unit
μV
μV
μV
μV
μV/°C
μV/°C
pA
pA
pA
pA
pA
pA
V
dB
V/mV
pF
pF
V
V
V
mV
mV
mV
mA
Ω
dB
mA
mA
V/μs
μs
MHz
Degrees
μV
nV/√Hz
nV/√Hz
pA/√Hz
dB
dB
Offset Voltage Drift, AD8616/AD8618
Offset Voltage Drift, AD8615
Input Bias Current
∆V
OS
/∆T
I
B
−40°C < T
A
< +85°C
−40°C < T
A
< +125°C
Input Offset Current
I
OS
−40°C < T
A
< +85°C
−40°C < T
A
< +125°C
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Input Capacitance
OUTPUT CHARACTERISTICS
Output Voltage High
CMRR
A
VO
C
DIFF
C
CM
V
OH
V
CM
= 0 V to 4.5 V
R
L
= 2 kΩ, V
O
= 0.5 V to 5 V
0
80
105
100
1500
2.5
6.7
4.99
4.92
7.5
70
±150
3
70
90
1.7
0.1
Output Voltage Low
V
OL
I
L
= 1 mA
I
L
= 10 mA
−40°C < T
A
< +125°C
I
L
= 1 mA
I
L
= 10 mA
−40°C < T
A
< +125°C
f = 1 MHz, A
V
= 1
V
S
= 2.7 V to 5.5 V
V
O
= 0 V
−40°C < T
A
< +125°C
R
L
= 2 kΩ
To 0.01%
4.98
4.88
4.7
15
100
200
Output Current
Closed-Loop Output Impedance
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current per Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Settling Time
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Peak-to-Peak Noise
Voltage Noise Density
Current Noise Density
Channel Separation
I
OUT
Z
OUT
PSRR
I
SY
2
2.5
SR
t
S
GBP
Ø
m
e
n
p-p
e
n
i
n
C
S
12
<0.5
24
63
2.4
10
7
0.05
−115
−110
0.1 Hz to 10 Hz
f = 1 kHz
f = 10 kHz
f = 1 kHz
f = 10 kHz
f = 100 kHz
Rev. E | Page 3 of 20
AD8615/AD8616/AD8618
V
S
= 2.7 V, V
CM
= V
S
/2, T
A
= 25°C, unless otherwise noted.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage, AD8616/AD8618
Offset Voltage, AD8615
Symbol
V
OS
Conditions
V
S
= 3.5 V at V
CM
= 0.5 V and 3.0 V
V
CM
= 0 V to 2.7 V
−40°C < T
A
< +125°C
−40°C < T
A
< +125°C
Min
Typ
23
23
80
1.5
3
0.2
Max
65
100
500
800
7
10
1
50
550
0.5
50
250
2.7
Unit
μV
μV
μV
μV
μV/°C
μV/°C
pA
pA
pA
pA
pA
pA
V
dB
V/mV
pF
pF
V
V
mV
mV
mA
Ω
dB
mA
mA
V/μs
μs
MHz
Degrees
μV
nV/√Hz
nV/√Hz
pA/√Hz
dB
dB
Offset Voltage Drift, AD8616/AD8618
Offset Voltage Drift, AD8615
Input Bias Current
∆V
OS
/∆T
I
B
−40°C < T
A
< +85°C
−40°C < T
A
< +125°C
Input Offset Current
I
OS
−40°C < T
A
< +85°C
−40°C < T
A
< +125°C
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Input Capacitance
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Output Current
Closed-Loop Output Impedance
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current per Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Settling Time
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Peak-to-Peak Noise
Voltage Noise Density
Current Noise Density
Channel Separation
CMRR
A
VO
C
DIFF
C
CM
V
OH
V
OL
I
OUT
Z
OUT
PSRR
I
SY
V
CM
= 0 V to 2.7 V
R
L
= 2 kΩ, V
O
= 0.5 V to 2.2 V
0
80
55
100
150
2.5
7.8
2.68
11
±50
3
70
90
1.7
0.1
I
L
= 1 mA
−40°C < T
A
< +125°C
I
L
= 1 mA
−40°C < T
A
< +125°C
f = 1 MHz, A
V
= 1
V
S
= 2.7 V to 5.5 V
V
O
= 0 V
−40°C < T
A
< +125°C
R
L
= 2 kΩ
To 0.01%
2.65
2.6
25
30
2
2.5
SR
t
S
GBP
Ø
m
e
n
p-p
e
n
i
n
C
S
12
<0.3
23
42
2.1
10
7
0.05
−115
−110
0.1 Hz to 10 Hz
f = 1 kHz
f = 10 kHz
f = 1 kHz
f = 10 kHz
f = 100 kHz
Rev. E | Page 4 of 20
