Zero-Drift, Single-Supply, Rail-to-Rail
Input/Output Operational Amplifier
AD8628/AD8629/AD8630
FEATURES
PIN CONFIGURATIONS
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
OUT
V–
1
2
3
5
V+
AD8628
TOP VIEW
(Not to Scale)
+IN
4
–IN
Figure 1. 5-Lead TSOT (UJ-5) and 5-Lead SOT-23 (RJ-5)
NC
–IN
+IN
V–
1
2
3
4
8
7
6
5
NC
V+
Overload recovery time: 50 μs
No external components required
Qualified for automotive applications
AD8628
OUT
NC
TOP VIEW
(Not to Scale)
NC = NO CONNECT
Figure 2. 8-Lead SOIC_N (R-8)
APPLICATIONS
Automotive sensors
Pressure and position sensors
Strain gage amplifiers
Medical instrumentation
Thermocouple amplifiers
Precision current sensing
Photodiode amplifiers
OUT A
–IN A
+IN A
V–
1
2
3
4
8
7
6
5
V+
AD8629
OUT B
–IN B
+IN B
TOP VIEW
(Not to Scale)
Figure 3. 8-Lead SOIC_N (R-8) and 8-Lead MSOP (RM-8)
1
2
3
4
5
6
7
14 OUT D
13 –IN D
12 +IN D
11 V–
OUT A
–IN A
+IN A
V+
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
(±±.35 V to ±2.5 V dual supply).
AD8630
TOP VIEW
(Not to Scale)
+IN B
–IN B
OUT B
10
+IN C
9
8
–IN C
OUT C
Figure 4. 14-Lead SOIC_N (R-14) and 14-Lead TSSOP (RU-14)
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.
The AD8628/AD8629/AD8630 are specified for the extended
industrial temperature range (−40°C to +±25°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 ±4-lead narrow SOIC and
±4-lead TSSOP plastic packages. See the Ordering Guide for
automotive grades.
With an offset voltage of only ± μV, drift of less than 0.005 ꢀV/°C,
and noise of only 0.5 μV p-p (0 Hz to ±0 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
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