AD8426_16 Datasheet, PDF (1/29 Pages) Analog Devices – Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier

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 MHz
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
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 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 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.
CONNECTION DIAGRAM
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- Zero
Purpose 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.}
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 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.
Rev. 0
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