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Zero-Drift, Single-Supply, Rail-to-Rail
Input/Output Operational Amplifier
AD8628/AD8629/AD8630
FEATURES
Lowest auto-zero amplifier noise
Low offset voltage: 1 μV
Input offset drift: 0.002 μV/°C
Rail-to-rail input and output swing
5 V single-supply operation
High gain, CMRR, and PSRR: 130 dB
Very low input bias current: 100 pA maximum
Low supply current: 1.0 mA
Overload recovery time: 50 μs
No external components required
Qualified for automotive applications
PIN CONFIGURATIONS
OUT
1
V–
2
+IN
3
AD8628
TOP VIEW
(Not to Scale)
5
V+
4
–IN
Figure 1. 5-Lead TSOT (UJ-5) and 5-Lead SOT-23 (RJ-5)
NC
1
–IN
2
+IN
3
8
NC
V+
AD8628
7
6
NC = NO CONNECT
APPLICATIONS
Automotive sensors
Pressure and position sensors
Strain gage amplifiers
Medical instrumentation
Thermocouple amplifiers
Precision current sensing
Photodiode amplifiers
Figure 2. 8-Lead SOIC_N (R-8)
OUT A
1
–IN A
2
8
V+
Figure 3. 8-Lead SOIC_N (R-8) and 8-Lead MSOP (RM-8)
GENERAL DESCRIPTION
This amplifier has ultralow offset, drift, and bias current.
The AD8628/AD8629/AD8630 are wide bandwidth auto-zero
amplifiers featuring rail-to-rail input and output swing and low
noise. Operation is fully specified from 2.7 V to 5 V single supply
(±1.35 V to ±2.5 V dual supply).
The AD8628/AD8629/AD8630 provide benefits previously
found only in expensive auto-zeroing or chopper-stabilized
amplifiers. Using Analog Devices, Inc., topology, these zero-
drift amplifiers combine low cost with high accuracy and low
noise. No external capacitor is required. In addition, the AD8628/
AD8629/AD8630 greatly reduce the digital switching noise
found in most chopper-stabilized amplifiers.
With an offset voltage of only 1 μV, drift of less than 0.005 μV/°C,
and noise of only 0.5 μV p-p (0 Hz to 10 Hz), the AD8628/
AD8629/AD8630 are suited for applications where error
sources cannot be tolerated. Position and pressure sensors,
medical equipment, and strain gage amplifiers benefit greatly
from nearly zero drift over their operating temperature range.
Many systems can take advantage of the rail-to-rail input and
output swings provided by the AD8628/AD8629/AD8630 to
reduce input biasing complexity and maximize SNR.
Rev. I
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.
OUT A
1
–IN A
2
+IN A
3
V+
4
14
OUT D
13
–IN D
AD8630
12
+IN D
TOP VIEW
11
V–
(Not to Scale)
10
+IN C
+IN B
5
OUT B
7
8
OUT C
Figure 4. 14-Lead SOIC_N (R-14) and 14-Lead TSSOP (RU-14)
The AD8628/AD8629/AD8630 are specified for the extended
industrial temperature range (−40°C to +125°C). The AD8628
is available in tiny 5-lead TSOT, 5-lead SOT-23, and 8-lead
narrow SOIC plastic packages. The AD8629 is available in the
standard 8-lead narrow SOIC and MSOP plastic packages. The
AD8630 quad amplifier is available in 14-lead narrow SOIC and
14-lead TSSOP plastic packages. See the Ordering Guide for
automotive grades.
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 ©2002–2011 Analog Devices, Inc. All rights reserved.
02735-066
–IN B
6
9
–IN C
02735-063
OUT B
TOP VIEW
+IN A
3
6
–IN B
(Not to Scale)
V–
4
5
+IN B
7
AD8629
02735-002
OUT
TOP VIEW
(Not to Scale)
5
NC
V–
4
02735-001
AD8628/AD8629/AD8630
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics—V
S
= 5.0 V....................................... 3
Electrical Characteristics—V
S
= 2.7 V....................................... 4
Absolute Maximum Ratings............................................................ 5
Thermal Characteristics .............................................................. 5
ESD Caution.................................................................................. 5
Typical Performance Characteristics ............................................. 6
Functional Description .................................................................. 14
1/f Noise....................................................................................... 14
Peak-to-Peak Noise .................................................................... 15
Noise Behavior with First-Order, Low-Pass Filter ................. 15
Total Integrated Input-Referred Noise for First-Order Filter15
Input Overvoltage Protection ................................................... 16
Output Phase Reversal............................................................... 16
Overload Recovery Time .......................................................... 16
Infrared Sensors.......................................................................... 17
Precision Current Shunt Sensor ............................................... 18
Output Amplifier for High Precision DACs........................... 18
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 21
REVISION HISTORY
4/11—Rev. H to Rev. I
Updated Outline Dimensions ....................................................... 19
Changes to Ordering Guide .......................................................... 21
4/10—Rev. G to Rev. H
Change to Features List.................................................................... 1
Change to General Description Section ........................................ 1
Changes to Table 3............................................................................ 5
Updated Outline Dimensions Section ......................................... 19
Changes to Ordering Guide .......................................................... 21
6/08—Rev. F to Rev. G
Changes to Features Section............................................................ 1
Changes to Table 5 and Figure 42 Caption ................................. 12
Changes to 1/f Noise Section and Figure 49 ............................... 14
Changes to Figure 51 Caption and Figure 55 ............................. 15
Changes to Figure 57 Caption and Figure 58 Caption .............. 16
Changes to Figure 60 Caption and Figure 61 Caption .............. 17
Changes to Figure 64...................................................................... 18
2/08—Rev. E to Rev. F
Renamed TSOT-23 to TSOT ............................................Universal
Deleted Figure 4 and Figure 6......................................................... 1
Changes to Figure 3 and Figure 4 Captions .................................. 1
Changes to Table 1............................................................................ 3
Changes to Table 2............................................................................ 4
Changes to Table 4............................................................................ 5
Updated Outline Dimensions ....................................................... 19
Changes to Ordering Guide .......................................................... 20
5/05—Rev. D to Rev. E
Changes to Ordering Guide .......................................................... 22
1/05—Rev. C to Rev. D
Added AD8630 ...................................................................Universal
Added Figure 5 and Figure 6............................................................1
Changes to Caption in Figure 8 and Figure 9 ................................7
Changes to Caption in Figure 14.....................................................8
Changes to Figure 17.........................................................................8
Changes to Figure 23 and Figure 24................................................9
Changes to Figure 25 and Figure 26............................................. 10
Changes to Figure 31...................................................................... 11
Changes to Figure 40, Figure 41, Figure 42................................. 12
Changes to Figure 43 and Figure 44............................................. 13
Changes to Figure 51...................................................................... 15
Updated Outline Dimensions....................................................... 20
Changes to Ordering Guide .......................................................... 20
10/04—Rev. B to Rev. C
Updated Formatting...........................................................Universal
Added AD8629 ...................................................................Universal
Added SOIC and MSOP Pin Configurations ................................1
Added Figure 48 ............................................................................. 13
Changes to Figure 62...................................................................... 17
Added MSOP Package ................................................................... 19
Changes to Ordering Guide .......................................................... 22
10/03—Rev. A to Rev. B
Changes to General Description .....................................................1
Changes to Absolute Maximum Ratings........................................4
Changes to Ordering Guide .............................................................4
Added TSOT-23 Package .............................................................. 15
6/03—Rev. 0 to Rev. A
Changes to Specifications.................................................................3
Changes to Ordering Guide .............................................................4
Change to Functional Description............................................... 10
Updated Outline Dimensions....................................................... 15
10/02—Revision 0: Initial Version
Rev. I | Page 2 of 24
AD8628/AD8629/AD8630
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS—V
S
= 5.0 V
V
S
= 5.0 V, V
CM
= 2.5 V, T
A
= 25°C, unless otherwise noted.
Table 1.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Input Bias Current
AD8628/AD8629
AD8630
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Offset Voltage Drift
OUTPUT CHARACTERISTICS
Output Voltage High
Symbol
V
OS
−40°C ≤ T
A
≤ +125°C
I
B
30
100
−40°C ≤ T
A
≤ +125°C
I
OS
−40°C ≤ T
A
≤ +125°C
CMRR
A
VO
∆V
OS
/∆T
V
OH
V
CM
= 0 V to 5 V
−40°C ≤ T
A
≤ +125°C
R
L
= 10 kΩ, V
O
= 0.3 V to 4.7 V
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +125°C
R
L
= 100 kΩ to ground
−40°C ≤ T
A
≤ +125°C
R
L
= 10 kΩ to ground
−40°C ≤ T
A
≤ +125°C
R
L
= 100 kΩ to V+
−40°C ≤ T
A
≤ +125°C
R
L
= 10 kΩ to V+
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +125°C
Output Current
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current per Amplifier
INPUT CAPACITANCE
Differential
Common Mode
DYNAMIC PERFORMANCE
Slew Rate
Overload Recovery Time
Gain Bandwidth Product
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
Current Noise Density
I
O
−40°C ≤ T
A
≤ +125°C
PSRR
I
SY
C
IN
1.5
8.0
SR
GBP
e
n
p-p
e
n
i
n
0.1 Hz to 10 Hz
0.1 Hz to 1.0 Hz
f = 1 kHz
f = 10 Hz
R
L
= 10 kΩ
1.0
0.05
2.5
0.5
0.16
22
5
pF
pF
V/μs
ms
MHz
μV p-p
μV p-p
nV/√Hz
fA/√Hz
V
S
= 2.7 V to 5.5 V, −40°C ≤ T
A
≤ +125°C
V
O
= V
S
/2
−40°C ≤ T
A
≤ +125°C
115
0
120
115
125
120
140
130
145
135
0.002
4.996
4.995
4.98
4.97
1
2
10
15
±50
±40
±30
±15
130
0.85
1.0
50
100
300
1.5
200
250
5
pA
pA
nA
pA
pA
V
dB
dB
dB
dB
μV/°C
V
V
V
V
mV
mV
mV
mV
mA
mA
mA
mA
dB
mA
mA
Conditions
Min
Typ
1
Max
5
10
Unit
μV
μV
0.02
4.99
4.99
4.95
4.95
Output Voltage Low
V
OL
5
5
20
20
Short-Circuit Limit
I
SC
±25
1.1
1.2
Rev. I | Page 3 of 24
AD8628/AD8629/AD8630
ELECTRICAL CHARACTERISTICS—V
S
= 2.7 V
V
S
= 2.7 V, V
CM
= 1.35 V, V
O
= 1.4 V, T
A
= 25°C, unless otherwise noted.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Input Bias Current
AD8628/AD8629
AD8630
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Offset Voltage Drift
OUTPUT CHARACTERISTICS
Output Voltage High
Symbol
V
OS
−40°C ≤ T
A
≤ +125°C
I
B
30
100
1.0
50
0
115
110
110
105
100
300
1.5
200
250
2.7
pA
pA
nA
pA
pA
V
dB
dB
dB
dB
μV/°C
V
V
V
V
mV
mV
mV
mV
mA
mA
mA
mA
dB
mA
mA
pF
pF
V/μs
ms
MHz
μV p-p
nV/√Hz
fA/√Hz
Conditions
Min
Typ
1
Max
5
10
Unit
μV
μV
−40°C ≤ T
A
≤ +125°C
I
OS
−40°C ≤ T
A
≤ +125°C
CMRR
A
VO
∆V
OS
/∆T
V
OH
V
CM
= 0 V to 2.7 V
−40°C ≤ T
A
≤ +125°C
R
L
= 10 kΩ, V
O
= 0.3 V to 2.4 V
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +125°C
R
L
= 100 kΩ to ground
−40°C ≤ T
A
≤ +125°C
R
L
= 10 kΩ to ground
−40°C ≤ T
A
≤ +125°C
R
L
= 100 kΩ to V+
−40°C ≤ T
A
≤ +125°C
R
L
= 10 kΩ to V+
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +125°C
Output Current
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current per Amplifier
INPUT CAPACITANCE
Differential
Common Mode
DYNAMIC PERFORMANCE
Slew Rate
Overload Recovery Time
Gain Bandwidth Product
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
Current Noise Density
I
O
−40°C ≤ T
A
≤ +125°C
PSRR
I
SY
C
IN
V
S
= 2.7 V to 5.5 V, −40°C ≤ T
A
≤ +125°C
V
O
= V
S
/2
−40°C ≤ T
A
≤ +125°C
115
130
120
140
130
0.002
2.695
2.695
2.68
2.675
1
2
10
15
±15
±10
±10
±5
130
0.75
0.9
1.5
8.0
0.02
2.68
2.68
2.67
2.67
Output Voltage Low
V
OL
5
5
20
20
Short-Circuit Limit
I
SC
±10
1.0
1.2
SR
GBP
e
n
p-p
e
n
i
n
R
L
= 10 kΩ
1
0.05
2
0.5
22
5
0.1 Hz to 10 Hz
f = 1 kHz
f = 10 Hz
Rev. I | Page 4 of 24
