40 μA Micropower Instrumentation

Amplifier with Zero Crossover Distortion

AD8236

Rev. 0

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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

Zero input crossover distortion

Rail-to-rail input and output

Gain set with single resistor

Operates from 1.8 V to 5.5 V

APPLICATIONS

Medical instrumentation

Low-side current sense

Portable devices

CONNECTION DIAGRAM

8

7

REF

6

5

AD8236

TOP VIEW

(Not to Scale)

Figure 1.

1.0

2.0

4.0

3.0

5.0

0.5

1.5

3.5

2.5

4.5

0

OUTPUT VOLTAGE (V)

5.5

5.0

0.5

–0.5

1.5 2.0

3.0

4.0

4.5

0

1.0

2.5

3.5

G = 5

G = 5

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.

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.

The AD8236 is available in an 8-lead MSOP and is specified

over the industrial temperature range of −40°C to +125°C.

Table 1. Instrumentation Amplifiers by Category1

General

Purpose

Zero Drift

Military

Grade

Low

Power

High Speed

PGA

AD8220

AD8230

AD620

AD8236

AD8250

AD8221

AD8231

AD621

AD627

AD8251

AD8222

AD8290

AD624

AD623

AD8253

AD8228

AD8293G80

AD524

AD8223

AD8295

AD8293G160

AD526

AD8226

AD8553

AD8556

AD8557