®
EL8171, EL8172
Data Sheet
July 27, 2009
FN6293.5
Micropower, Single Supply, Rail-to-Rail
Input-Output Instrumentation Amplifiers
The EL8171 and EL8172 are micropower instrumentation
amplifiers optimized for single supply operation over the
+2.4V to +5.5V range. Inputs and outputs can operate
rail-to-rail. As with all instrumentation amplifiers, a pair of
inputs provide very high common-mode rejection and are
completely independent from a pair of feedback terminals.
The feedback terminals allow zero input to be translated to
any output offset, including ground. A feedback divider
controls the overall gain of the amplifier.
The EL8172 is compensated for a gain of 100 or more, and
the EL8171 is compensated for a gain of 10 or more. The
EL8171 and EL8172 have PMOS input devices that provide
sub-nA input bias currents.
The amplifiers can be operated from one lithium cell or two
Ni-Cd batteries. The EL8171 and EL8172 input range goes
from below ground to slightly above positive rail. The output
stage swings completely to ground (ground sensing) or
positive supply - no pull-up or pull-down resistors are
needed.
Features
• 95µA maximum supply current
• Maximum input offset voltage
- 300µV (EL8172)
- 1500µV (EL8171)
• 50pA maximum input bias current
• 450kHz -3dB bandwidth (G = 10)
• 170kHz -3dB bandwidth (G = 100)
• Single supply operation
- Input voltage range is rail-to-rail
- Output swings rail-to-rail
- Ground sensing
• Pb-free (RoHS compliant)
Applications
• Battery- or solar-powered systems
• Strain gauges
• Current monitors
• Thermocouple amplifiers
Pinout
EL8171, EL8172
(8 LD SOIC)
TOP VIEW
DNC 1
IN- 2
IN+ 3
V- 4
-
+
+
-
Ordering Information
PART
NUMBER
(Note)
EL8171FSZ*
EL8172FSZ*
PART
MARKING
8171FSZ
8172FSZ
PACKAGE
(Pb-free)
8 Ld SOIC
8 Ld SOIC
PKG.
DWG. #
MDP0027
MDP0027
8 FB+
7 V+
6 VOUT
5 FB-
Σ
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets, molding compounds/die attach
materials, and 100% matte tin plate plus anneal (e3 termination
finish, which is RoHS compliant and compatible with both SnPb and
Pb-free soldering operations). Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J STD-020.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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