AD8426 Datasheet, PDF (1/20 Pages) Analog Devices – Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier

Preliminary Technical Data
Wide Supply Range, Rail-to-Rail
Output Instrumentation Amplifier
AD8426
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
Dual supply: ±1.35 V to ±18 V
Bandwidth (G = 1): 1.5 MHz
CMRR (G = 1): 80 dB minimum
Input noise: 22 nV/√Hz
Typical supply current (per amp): 350 μA
Specified temperature range: −40°C to +125°C
APPLICATIONS
Industrial process controls
Bridge amplifiers
Medical instrumentation
Portable data acquisition
Multichannel systems
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 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 also includes the ability to 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 single
supply.
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 as well as maximum input
Rev. PrD
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PIN CONFIGURATION
16 15 14 13
AD8426
–IN1 1
RG1 2
RG1 3
+IN1 4
12 –IN2
11 RG2
10 RG2
9 +IN2
5678
Figure 1.
Table 1. Instrumentation Amplifiers by Category¹
General
Purpose
Zero
Drift
Military
Grade
Low
Power
High Speed
PGA
AD8220 AD8231 AD620
AD627 AD8250
AD8221 AD8290 AD621
AD623 AD8251
AD8222 AD8293 AD524
AD8235 AD8253
AD8224 AD8553 AD526
AD8236
AD8228 AD8556 AD624
AD8426
AD8295 AD8557
AD8226
AD8227
1 _{See www.analog.com for the latest instrumentation amplifiers.}
bias currents are specified to facilitate open-wire detection.
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 back 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 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 AD8226 is the single channel version of the AD8426.
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