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: 120 dB
Very low input bias current: 100 pA maximum
Low supply current: 1.0 mA
Overload recovery time: 10 μs
No external components required
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
APPLICATIONS
Automotive sensors
Pressure and position sensors
Strain gage amplifiers
Medical instrumentation
Thermocouple amplifiers
Precision current sensing
Photodiode amplifier
NC = NO CONNECT
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)
OUT A
1
–IN A
2
+IN A
3
V+
4
+IN B
5
–IN B
6
OUT B
7
14
OUT D
13
–IN D
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 in which 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.
AD8630
12
+IN D
TOP VIEW
11
V–
(Not to Scale)
10
+IN C
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.
Rev. F
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: 781.461.3113 ©2002–2008 Analog Devices, Inc. All rights reserved.
02735-066
9
–IN C
02735-063
OUT B
TOP VIEW
+IN A
3
6
–IN B
(Not to Scale)
5
+IN B
V–
4
7
AD8629
02735-002
6
OUT
TOP VIEW
V–
4
(Not to Scale)
5
NC
02735-001
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