Wide Supply Range, Rail-to-Rail
Output Instrumentation Amplifier
AD8426
CONNECTION DIAGRAM
FEATURES
2 channels in a small, 4 mm × 4 mm LFCSP
LFCSP package has no metal pad
More routing room
No current leakage to pad
Gain set with 1 external resistor
Gain range: 1 to 1000
Input voltage goes below ground
Inputs protected beyond supplies
Very wide power supply range
Single supply: 2.2 V to 36 V
16 15 14 13
AD8426
12 –IN2
–IN1
RG1
RG1
+IN1
1
2
3
4
RG2
RG2
+IN2
11
10
9
5
6
7
8
Dual supply: 1.35 V to 18 V
Bandwidth (G = 1): 1 MHz
Figure 1.
CMRR (G = 1): 80 dB minimum
Input noise: 24 nV/√Hz
Typical supply current (per amplifier): 350 μA
Specified temperature range: −40°C to +125°C
Table 1. Instrumentation Amplifiers by Category1
General-
Purpose
Zero
Drift
Military
Grade
Low
Power
High Speed
PGA
AD8220
AD8221
AD8222
AD8224
AD8228
AD8295
AD8231
AD8290
AD8293
AD8553
AD8556
AD8557
AD620
AD621
AD524
AD526
AD624
AD627
AD623
AD8250
AD8251
AD8253
APPLICATIONS
Industrial process controls
Bridge amplifiers
Medical instrumentation
Portable data acquisition
Multichannel systems
AD8235
AD8236
AD8426
AD8226
AD8227
1 See www.analog.com for the latest instrumentation amplifiers.
GENERAL DESCRIPTION
The AD8426 is a dual-channel, low cost, wide supply range
instrumentation amplifier that requires only one external
resistor to set any gain from 1 to 1000.
The AD8426 is designed to make PCB routing easy and efficient.
The two amplifiers are arranged in a logical way so that typical
application circuits have short routes and few vias. Unlike most
chip scale packages, the AD8426 does not have an exposed metal
pad on the bottom of the part, which frees additional space for
routing and vias. The AD8426 offers two in-amps in the equivalent
board space of a typical MSOP package.
The AD8426 is designed to work with a variety of signal
voltages. A wide input range and rail-to-rail output allow the
signal to make full use of the supply rails. Because the input
range can also go below the negative supply, small signals near
ground can be amplified without requiring dual supplies. The
AD8426 operates on supplies ranging from 1.35 V to 18 V
for dual supplies and 2.2 V to 36 V for a single supply.
The AD8426 is ideal for multichannel, space-constrained industrial
applications. Unlike other low cost, low power instrumentation
amplifiers, the AD8426 is designed with a minimum gain of 1 and
can easily handle 10 V signals. With its space-saving LFCSP
package and 125°C temperature rating, the AD8426 thrives in
tightly packed, zero airflow designs.
The robust AD8426 inputs are designed to connect to real-
world sensors. In addition to its wide operating range, the
AD8426 can handle voltages beyond the rails. For example,
with a 5 V supply, the part is guaranteed to withstand 35 V
at the input with no damage. Minimum and maximum input
bias currents are specified to facilitate open-wire detection.
The AD8226 is the single-channel version of the AD8426.
Rev. 0
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