Dual Precision, Rail-to-Rail Output
Operational Amplifier
AD8698
FEATURES
Low offset voltage: 100 µV max
Low offset voltage drift: 2 µV/°C max
Low input bias current: 700 pA max
Low noise: 8 nV/√Hz
High common-mode rejection: 118 dB min
Wide operating temperature:
−40°C
to +85°C
No phase reversal
CONNECTION DIAGRAMS
8-Lead SOIC
(R-8)
OUT A
1
–IN A
2
+IN A
3
8
8-Lead MSOP
(RM-8)
V+
OUT B
04807-0-069
OUT A
1
–IN A
2
+IN A
3
8
V+
OUT B
04807-0-070
AD8698
7
AD8698
7
6
–IN B
TOP VIEW
V–
4
(Not to Scale)
5
+IN B
6
–IN B
TOP VIEW
V–
4
(Not to Scale)
5
+IN B
Figure 1.
APPLICATIONS
Photodiode amplifier
Sensors and controls
Multipole filters
Integrator
GENERAL DESCRIPTION
The AD8698 is a high precision, rail-to-rail output, low noise,
low input bias current operational amplifier. Offset voltage is a
respectable 100 µV max and drift over temperature is below
2 µV/°C, eliminating the need for manual offset trimming. The
AD8698 is ideal for high impedance sensors, minimizing offset
errors due to input bias and offset currents.
The rail-to-rail output maximizes dynamic range in a variety of
applications, such as photodiode amplifiers, DAC I/V
amplifiers, filters, and ADC input amplifiers.
The AD8698 dual amplifiers are offered in 8-lead MSOP and
narrow 8-lead SOIC packages. The MSOP version is available
in tape and reel only.
Rev. 0
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
www.analog.com
Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
AD8698
TABLE OF CONTENTS
Specifications .................................................................................... 3
Absolute Maximum Ratings ........................................................... 5
Thermal Resistance ...................................................................... 5
ESD Caution.................................................................................. 5
Typical Performance Characteristics............................................. 6
Applications .................................................................................... 14
Input Overvoltage Protection................................................... 14
Driving Capacitive Loads .......................................................... 14
Instrumentation Amplifier ....................................................... 15
Composite Amplifier ................................................................. 15
Low Noise Applications ............................................................ 16
Driving ADCs ............................................................................. 16
Using the AD8698 in Active Filter Designs ........................... 16
Outline Dimensions....................................................................... 17
Ordering Guide .......................................................................... 17
REVISION HISTORY
4/04—Revision 0: Initial Version
Rev. 0 | Page 2 of 20
AD8698
SPECIFICATIONS
V
S
= ±15 V, V
CM
= 0 V (@T
A
= 25
o
C, unless otherwise noted.)
Table 1.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Offset Voltage Drift
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Input Capacitance
OUTPUT CHARACTERISTICS
Output Voltage Swing
V
OS
−40°C
< T
A
< +85°C
∆V
OS
/∆T
I
B
I
OS
IVR
CMRR
A
VO
C
DIFF
C
CM
V
OH
V
OH
(Ref. to GND)
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current
Supply Voltage
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Input Noise Voltage
Input Voltage Noise Density
Input Voltage Noise Density
Current Noise Density
V
OL
V
OL
PSRR
I
SY
V
S
SR
GBP
Ø
O
e
n
p-p
e
n
e
n
i
n
0.1 Hz < f < 10 Hz
f = 10 Hz
f = 1 kHz
f = 1 kHz
0.6
15
8
0.2
−40°C
< T
A
< +85°C
−40°C
< T
A
< +85°C
V
CM
= ±13.5 V
R
L
= 2 kΩ, V
O
= ±13.5 V
−13.5V
118
900
−40°C
< T
A
< +85°C
−40°C
< T
A
< +85°C
0.6
20
100
300
2
700
1500
700
1500
13.5
132
1450
6.5
4.6
14.93
14.8
−14.93
−14.82
114
132
2.8
−14.6
−14.5
µV
µV
µV/°C
pA
pA
pA
pA
V
dB
V/mV
pF
pF
V
V
V
V
dB
mA
mA
V
V/µs
MHz
60
Degrees
µV p-p
nV/√Hz
nV/√Hz
pA/√Hz
Symbol
Conditions
Min
Typ
Max
Unit
(Ref. to GND)
I
L
= 1 mA,
−40°C
< T
A
< +85°C
I
L
= 5 mA,
−40°C
< T
A
< +85°C
I
L
= 1 mA,
−40°C
< T
A
< +85°C
I
L
= 5 mA,
−40°C
< T
A
< +85°C
±2.5 V < V
S
< ±15 V
V
O
= 0 V
−40°C
< T
A
< +85°C
−40°C
< T
A
< +85°C
R
L
= 2 kΩ
14.85
14.6
±2.5
0.4
1
3.2
3.8
±15
Rev. 0 | Page 3 of 20
AD8698
V
S
= ±2.5 V, V
CM
= 0 V (@T
A
= 25
o
C, unless otherwise noted.)
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Offset Voltage Drift
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Input Capacitance
OUTPUT CHARACTERISTICS
Output Voltage Swing
(Ref. to GND)
(Ref. to GND)
V
OS
−40°C
< T
A
< +85°C
∆V
OS
/∆T
I
B
I
OS
IVR
CMRR
A
VO
C
DIFF
C
CM
V
OH
V
OH
V
OL
V
OL
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current
Supply Voltage
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Input Noise Voltage
Input Voltage Noise Density
Input Voltage Noise Density
Current Noise Density
−40°C
< T
A
< +85°C
−40°C
< T
A
< +85°C
V
CM
= ±13.5 V
R
L
= 2 kΩ, V
O
= ±13.5 V
−1.5
105
600
−40°C
< T
A
< +85°C
−40°C
< T
A
< +85°C
20
100
300
2
700
1500
700
1500
+1.5
120
1200
6.4
4.6
2.44
2.29
−2.43
−2.15
−2.2
−1.9
−1.6
114
132
2.3
dB
mA
mA
V
V/µs
MHz
Degrees
µV p-p
nV/√Hz
nV/√Hz
pA/√Hz
µV
µV
µV/°C
pA
pA
pA
pA
V
dB
V/mV
pF
pF
V
V
V
V
Symbol
Conditions
Min
Typ
Max
Unit
I
L
= 1 mA,
−40°C
< T
A
< +85°C
I
L
= 5 mA,
−40°C
< T
A
< +85°C
I
L
= 1 mA,
−40°C
< T
A
< +85°C
I
L
= 5 mA, T
A
= 25°C
I
L
= 5mA,
−40°C<T
A
<+85°C
2.35
2.1
PSRR
I
SY
Vs
SR
GBP
Øo
e
n
p-p
e
n
e
n
i
n
±2.5 V < V
S
< ±15 V
V
O
= 0 V
−40°C
< T
A
< +85°C
−40°C
< T
A
< +85°C
R
L
= 2 kΩ
±2.5
0.4
1
60
2.8
3.3
±15
0.1 Hz < f < 10Hz
f = 10 Hz
f =1 kHz
f = 1 kHz
0.6
15
8
0.2
Rev. 0 | Page 4 of 20
AD8698
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Supply Voltage
Input Voltage
Differential Input Voltage
Output Short-Circuit Duration
to Gnd
Storage Temperature Range
R, RM Packages
Operating Temperature Range
Junction Temperature Range
R, RM Packages
Lead Temperature Range
(Soldering, 60 Sec)
Rating
±15 V
±V
S
±V
S
Indefinite
−65°C
to +150°C
−40°C
to +85°C
−65°C
to +150°C
+300°C
THERMAL RESISTANCE
θ
JA
is specified for the worst-case conditions, i.e.,
θ
JA
is specified
for devices soldered in circuit boards for surface-mount
packages.
Table 4. Thermal Resistance
Package Type
MSOP-8 (RM)
SOIC-8 (R)
θ
JA
210
158
θ
JC
45
43
Unit
°C/W
°C/W
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.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 1000 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. 0 | Page 5 of 20
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