Zero-Drift, Single-Supply, Rail-to-Rail
Input/Output Operational Amplifier
AD8629-EP
Data Sheet
PIN CONFIGURATION
Lowest auto-zero amplifier noise
Low offset voltage: 1 μV typical
Input offset drift: 0.002 μV/°C typical
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
ENHANCED PRODUCT FEATURES
Supports defense and aerospace applications (AQEC standard)
Extended temperature range: −55°C to +125°C
Controlled manufacturing baseline
One assembly/test site
One fabrication site
Enhanced product change notification
Qualification data available on request
APPLICATIONS
OUT A 1
8
V+
–IN A 2
AD8629-EP
7
OUT B
+IN A 3
TOP VIEW
(Not to Scale)
6
–IN B
5
+IN B
V– 4
12890-001
FEATURES
Figure 1. 8-Lead SOIC_N (R-8)
GENERAL DESCRIPTION
The AD8629-EP amplifier has ultralow offset, drift, and bias
current. The device is a wide bandwidth auto-zero amplifier
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 AD8629-EP provides benefits previously found only in
expensive auto-zeroing or chopper-stabilized amplifiers. Using
Analog Devices, Inc., topology, this zero-drift amplifier
combines low cost with high accuracy and low noise. No
external capacitor is required. In addition, the AD8629-EP
greatly reduces the digital switching noise found in most
chopper-stabilized amplifiers.
With an offset voltage of only 1 μV, drift of less than 0.05 μV/°C,
and noise of only 0.5 μV p-p (0 Hz to 10 Hz), the AD8629-EP is
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 the
operating temperature range. Many systems can take advantage
of the rail-to-rail input and output swings provided by the
AD8629-EP to reduce input biasing complexity and maximize
SNR.
Pressure and position sensors
Strain gage amplifiers
Medical instrumentation
Thermocouple amplifiers
Precision current sensing
Photodiode amplifiers
The AD8629-EP is specified for the extended industrial
temperature range (−55°C to +125°C). The AD8629-EP is
available in a standard 8-lead narrow SOIC plastic package.
Rev. A
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Trademarks and registered trademarks are the property of their respective owners.
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Tel: 781.329.4700 ©2002–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
AD8629-EP
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Electrical Characteristics—VS = 2.7 V........................................4
Enhanced Product Features ............................................................ 1
Absolute Maximum Ratings ............................................................5
Applications ....................................................................................... 1
Thermal Characteristics ...............................................................5
Pin Configuration ............................................................................. 1
ESD Caution...................................................................................5
General Description ......................................................................... 1
Typical Performance Characteristics ..............................................6
Revision History ............................................................................... 2
Outline Dimensions ..........................................................................8
Specifications..................................................................................... 3
Ordering Guide .............................................................................8
Electrical Characteristics—VS = 5.0 V ....................................... 3
REVISION HISTORY
8/15—Rev. 0 to Rev. A
Changes to Ordering Guide ............................................................ 8
6/15—Revision 0: Initial Version
Rev. A | Page 2 of 8
Data Sheet
AD8629-EP
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS—VS = 5.0 V
VS = 5.0 V, VCM = 2.5 V, TA = 25°C, unless otherwise noted.
Table 1.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Symbol
Test Conditions/Comments
Min
VOS
Typ
Max
Unit
1
5
15
100
1.5
200
250
5
µV
µV
pA
nA
pA
pA
V
dB
dB
dB
dB
µV/°C
−55°C ≤ TA ≤ +125°C
Input Bias Current
IB
30
−55°C ≤ TA ≤ +125°C
Input Offset Current
IOS
50
−55°C ≤ TA ≤ +125°C
Input Voltage Range
Common-Mode Rejection Ratio
CMRR
Large Signal Voltage Gain
AVO
Offset Voltage Drift
OUTPUT CHARACTERISTICS
Output Voltage High
∆VOS/∆T
VOH
Output Voltage Low
VOL
Short-Circuit Limit
ISC
VCM = 0 V to 5 V
−55°C ≤ TA ≤ +125°C
RL = 10 kΩ, VO = 0.3 V to 4.7 V
−55°C ≤ TA ≤ +125°C
−55°C ≤ TA ≤ +125°C
RL = 100 kΩ to ground
−55°C ≤ TA ≤ +125°C
RL = 10 kΩ to ground
−55°C ≤ TA ≤ +125°C
RL = 100 kΩ to V+
−55°C ≤ TA ≤ +125°C
RL = 10 kΩ to V+
−55°C ≤ TA ≤ +125°C
0
120
115
125
120
4.99
4.99
4.95
4.95
±25
−55°C ≤ TA ≤ +125°C
Output Current
IO
−55°C ≤ TA ≤ +125°C
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
PSRR
ISY
VS = 2.7 V to 5.5 V, −55°C ≤ TA ≤ +125°C
VO = VS/2
−55°C ≤ TA ≤ +125°C
115
140
130
145
135
0.008
4.996
4.995
4.98
4.97
1
2
10
15
±50
±40
±30
±15
130
0.85
1.0
0.05
5
5
20
20
1.1
1.2
V
V
V
V
mV
mV
mV
mV
mA
mA
mA
mA
dB
mA
mA
CIN
SR
1.5
8.0
pF
pF
RL = 10 kΩ
1.0
0.05
2.5
V/µs
ms
MHz
0.1 Hz to 10 Hz
0.1 Hz to 1.0 Hz
f = 1 kHz
f = 10 Hz
0.5
0.16
22
5
µV p-p
µV p-p
nV/√Hz
fA/√Hz
GBP
en p-p
en
in
Rev. A | Page 3 of 8
AD8629-EP
Data Sheet
ELECTRICAL CHARACTERISTICS—VS = 2.7 V
VS = 2.7 V, VCM = 1.35 V, VO = 1.4 V, TA = 25°C, unless otherwise noted.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Symbol
Test Conditions/Comments
Min
VOS
Typ
Max
Unit
1
5
15
100
1.5
200
250
2.7
µV
µV
pA
nA
pA
pA
V
dB
dB
dB
dB
µV/°C
−55°C ≤ TA ≤ +125°C
Input Bias Current
IB
30
1.0
50
−55°C ≤ TA ≤ +125°C
Input Offset Current
IOS
−55°C ≤ TA ≤ +125°C
Input Voltage Range
Common-Mode Rejection Ratio
CMRR
Large Signal Voltage Gain
AVO
Offset Voltage Drift
OUTPUT CHARACTERISTICS
Output Voltage High
∆VOS/∆T
VOH
Output Voltage Low
VOL
Short-Circuit Limit
ISC
VCM = 0 V to 2.7 V
−55°C ≤ TA ≤ +125°C
RL = 10 kΩ, VO = 0.3 V to 2.4 V
−55°C ≤ TA ≤ +125°C
−55°C ≤ TA ≤ +125°C
RL = 100 kΩ to ground
−55°C ≤ TA ≤ +125°C
RL = 10 kΩ to ground
−55°C ≤ TA ≤ +125°C
RL = 100 kΩ to V+
−55°C ≤ TA ≤ +125°C
RL = 10 kΩ to V+
−55°C ≤ TA ≤ +125°C
0
115
110
110
105
2.68
2.68
2.67
2.67
±10
−55°C ≤ TA ≤ +125°C
Output Current
IO
−55°C ≤ TA ≤ +125°C
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
PSRR
ISY
VS = 2.7 V to 5.5 V, −55°C ≤ TA ≤ +125°C
VO = VS/2
−55°C ≤ TA ≤ +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
0.05
5
5
20
20
1.0
1.2
V
V
V
V
mV
mV
mV
mV
mA
mA
mA
mA
dB
mA
mA
CIN
SR
1.5
8.0
pF
pF
RL = 10 kΩ
1
0.05
2
V/µs
ms
MHz
0.1 Hz to 10 Hz
f = 1 kHz
f = 10 Hz
0.5
22
5
µV p-p
nV/√Hz
fA/√Hz
GBP
en p-p
en
in
Rev. A | Page 4 of 8
Data Sheet
AD8629-EP
ABSOLUTE MAXIMUM RATINGS
THERMAL CHARACTERISTICS
Table 3.
Parameter
Supply Voltage
Input Voltage
Differential Input Voltage1
Output Short-Circuit Duration to GND
Storage Temperature Range
Operating Temperature Range
Junction Temperature Range
Lead Temperature (Soldering, 60 sec)
ESD
HBM 8-Lead SOIC_N
FICDM 8-Lead SOIC_N
1
Rating
6V
GND − 0.3 V to VS + 0.3 V
±5.0 V
Indefinite
−65°C to +150°C
−55°C to +125°C
−65°C to +150°C
300°C
θJA is specified for worst-case conditions, that is, θJA is specified
for the device soldered in a circuit board for surface-mount
packages. This was measured using a standard two-layer board.
Table 4.
Package Type
8-Lead SOIC_N (R-8)
ESD CAUTION
±4000 V
±1250 V
The differential input voltage is limited to ±5 V or the supply voltage,
whichever is less.
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
Rev. A | Page 5 of 8
θJA
158
θJC
43
Unit
°C/W
AD8629-EP
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
700
60
VS = 5V
+85°C
600
INPUT BIAS CURRENT (pA)
40
30
20
+25°C
10
1
300
200
100
–40°C
0
400
2
3
4
5
INPUT COMMON-MODE VOLTAGE (V)
6
0
–75
Figure 2. Input Bias Current vs. Input Common-Mode Voltage
+75
+125
+150
+100
+50
0
–50
–100
–150
–75
–25
+25
TEMPERATURE (°C)
+75
+125
VS = 5V
+ISC
–ISC
+100
+50
0
–50
–100
–150
–75
Figure 3. Output Short-Circuit Current vs. Temperature (2.7 V)
–25
+25
TEMPERATURE (°C)
+75
+125
12890-006
+ISC
–ISC
OUTPUT SHORT-CIRCUIT CURRENT (mA)
VS = 2.7V
12890-003
OUTPUT SHORT-CIRCUIT CURRENT (mA)
+25
TEMPERATURE (°C)
Figure 5. Input Bias Current vs. Temperature
+150
Figure 6. Output Short-Circuit Current vs. Temperature (5 V)
1k
1k
100
VCC – VOH @ 100kΩ
VOL – VEE @ 100kΩ
OUTPUT-TO-RAIL VOLTAGE (mV)
VCC – VOH @ 1kΩ
VOL – VEE @ 1kΩ
VCC – VOH @ 10kΩ
VOL – VEE @ 10kΩ
10
1
0.1
–75
VS = 2.7V
–25
+25
TEMPERATURE (°C)
+75
+125
100
12890-004
OUTPUT-TO-RAIL VOLTAGE (mV)
–25
VCC – VOH @ 1kΩ
VOL – VEE @ 1kΩ
VCC – VOH @ 10kΩ
VOL – VEE @ 10kΩ
VCC – VOH @ 100kΩ
VOL – VEE @ 100kΩ
10
1
0.1
–75
VS = 5V
–25
+25
TEMPERATURE (°C)
+75
+125
Figure 7. Output-to-Rail Voltage vs. Temperature (5 V)
Figure 4. Output-to-Rail Voltage vs. Temperature (2.7 V)
Rev. A | Page 6 of 8
12890-007
0
500
12890-002
INPUT BIAS CURRENT (pA)
50
12890-005
VS = 5V
Data Sheet
AD8629-EP
900
18
VS = 5V
TA = –55°C TO +125°C
VCM = 2.5V
700
12
10
8
6
500
400
300
4
200
2
100
0
–6
–4
–2
0
+2
+4 +6 +8 +10 +12 +14 +16 +18 +20
TCVOS (nV/C)
0
–75
140
130
VS = 2.7V TO 5V
120
110
100
90
80
70
–25
+25
TEMPERATURE (°C)
+75
+125
12890-009
60
50
–75
VS = 2.7V
VS = 5V
–25
+25
TEMPERATURE (°C)
+75
Figure 10. Supply Current vs. Temperature
Figure 8. Input Offset Voltage Drift Distribution
POWER SUPPLY REJECTION (dB)
600
Figure 9. Power Supply Rejection vs. Temperature
Rev. A | Page 7 of 8
+125
12890-010
SUPPLY CURRENT (µA)
14
800
12890-008
NUMBER OF AMPLIFIERS
16
AD8629-EP
Data Sheet
OUTLINE DIMENSIONS
5.00 (0.1968)
4.80 (0.1890)
1
5
4
1.27 (0.0500)
BSC
0.25 (0.0098)
0.10 (0.0040)
6.20 (0.2441)
5.80 (0.2284)
1.75 (0.0688)
1.35 (0.0532)
0.51 (0.0201)
0.31 (0.0122)
COPLANARITY
0.10
SEATING
PLANE
0.50 (0.0196)
0.25 (0.0099)
45°
8°
0°
0.25 (0.0098)
0.17 (0.0067)
1.27 (0.0500)
0.40 (0.0157)
COMPLIANT TO JEDEC STANDARDS MS-012-AA
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
012407-A
8
4.00 (0.1574)
3.80 (0.1497)
Figure 11. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body
(R-8)
Dimensions shown in millimeters and (inches)
ORDERING GUIDE
Model 1
AD8629TRZ-EP
AD8629TRZ-EP-R7
1
Temperature Range
−55°C to +125°C
−55°C to +125°C
Package Description
8-Lead Standard Small Outline Package [SOIC_N]
8-Lead Standard Small Outline Package [SOIC_N]
Z = RoHS Compliant Part.
©2002–2015 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D12890-0-8/15(A)
Rev. A | Page 8 of 8
Package Option
R-8
R-8