1.8 V, Micropower, Zero-Drift,
Rail-to-Rail Input/Output Op Amp
ADA4051-1/ADA4051-2
FEATURES
PIN CONFIGURATION
Very low supply current: 13 μA typical
Low offset voltage: 15 μV maximum
Offset voltage drift: 20 nV/°C
Single-supply operation: 1.8 V to 5.5 V
High PSRR: 110 dB minimum
High CMRR: 110 dB minimum
Rail-to-rail input/output
OUT
V–
1
2
3
5
V+
ADA4051-1
TOP VIEW
(Not to Scale)
+IN
4
–IN
Figure 1. 5-Lead SOT-23 (RJ-5)
+IN
V–
1
2
3
5
V+
Unity-gain stable
Extended industrial temperature range
ADA4051-1
TOP VIEW
(Not to Scale)
APPLICATIONS
–IN
4
OUT
Pressure and position sensors
Temperature measurements
Electronic scales
Medical instrumentation
Battery-powered equipment
Handheld test equipment
Figure 2. 5-Lead SC-70 (KS-5)
OUT A
–IN A
+IN A
V–
1
2
3
4
8
7
6
5
V+
ADA4051-2
OUT B
–IN B
+IN B
TOP VIEW
(Not to Scale)
Figure 3. 8-Lead MSOP (RM-8)
PIN 1
INDICATOR
OUT A
–IN A
+IN A
V–
1
2
3
4
8
7
6
5
V+
OUT B
–IN B
+IN B
ADA4051-2
TOP VIEW
(Not to Scale)
NOTES
1. IT IS RECOMMENDED THAT THE
EXPOSED PAD BE CONNECTED TO V–.
Figure 4. 8-Lead LFCSP (CP-8-2)
GENERAL DESCRIPTION
The ADA4051-1/ADA4051-2 are CMOS, micropower, zero-
drift operational amplifiers utilizing an innovative chopping
technique. These amplifiers feature rail-to-rail input/output
swing and extremely low offset voltage while operating from a
1.8 V to 5.5 V power supply. In addition, these amplifiers offer
high power supply rejection ratio (PSRR) and common-mode
rejection ratio (CMRR) while operating with a typical supply
current of 13 μA per amplifier. This combination of features
makes the ADA4051-1/ADA4051-2 amplifiers ideal choices for
battery-powered applications where high precision and low
power consumption are important.
The ADA4051-1/ADA4051-2 are specified for the extended
industrial temperature range of −40°C to +125°C. The ADA4051-1
amplifier is available in 5-lead SOT-23 and 5-lead SC-70 packages.
The ADA4051-2 amplifier is available in 8-lead MSOP and 8-lead
LFCSP packages.
The ADA4051-1/ADA4051-2 are members of a growing series
of zero-drift op amps offered by Analog Devices, Inc. Refer to
Table 1 for a list of these devices.
Table 1. Op Amps
Supply Low Power, 5 V 5 V
16 V
Single
Dual
Quad
AD8538
AD8539
AD8628
AD8629
AD8630
AD8638
AD8639
Rev. B
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