40 μA Micropower Instrumentation
Amplifier with Zero Crossover Distortion
AD8236
CONNECTION DIAGRAM
FEATURES
Low power: 40 μA supply current (maximum)
Low input currents
1 pA input bias current
0.5 pA input offset current
High CMRR: 110 dB CMRR, G = 100
Space-saving MSOP
–IN
1
2
3
4
8
7
6
5
+V
V
S
R
G
OUT
R
REF
G
+IN
–V
S
AD8236
TOP VIEW
(Not to Scale)
Zero input crossover distortion
Rail-to-rail input and output
Gain set with single resistor
Operates from 1.8 V to 5.5 V
Figure 1.
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
G = 5
APPLICATIONS
V
V
= 5V
S
= 2.5V
REF
Medical instrumentation
Low-side current sense
Portable devices
G = 5
V
V
= 1.8V
S
= 0.9V
REF
–0.5
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
OUTPUT VOLTAGE (V)
Figure 2. Wide Common-Mode Voltage Range vs. Output Voltage
GENERAL DESCRIPTION
The AD8236 is the lowest power instrumentation amplifier
in the industry. It has rail-to-rail outputs and can operate on
voltages as low as 1.8 V. Its 40 μA maximum supply current
makes it an excellent choice in battery-powered applications.
Table 1. Instrumentation Amplifiers by Category1
General
Purpose Zero Drift
Military Low
High Speed
PGA
Grade
AD620
AD621
AD624
AD524
Power
AD8220
AD8221
AD8222
AD8228
AD8295
AD8230
AD8231
AD8290
AD8293G80
AD8236 AD8250
AD627
AD623
AD8223
AD8226
AD8251
AD8253
The AD8236’s high input impedance, low input bias current of
1 pA, high CMRR of 110 dB (G = 100), small size, and low power
offer tremendous value. It has a wider common-mode voltage
range than typical three-op-amp instrumentation amplifiers,
making this a great solution for applications that operate on a
single 1.8 V or 3 V supply. An innovative input stage allows for
a wide rail-to-rail input voltage range without the crossover
distortion common in other designs.
AD8293G160 AD526
AD8553
AD8556
AD8557
1 See www.analog.com/inamps for the latest instrumentation amplifiers.
The AD8236 is available in an 8-lead MSOP and is specified
over the industrial temperature range of −40°C to +125°C.
Rev. 0
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