EL8171_06 Datasheet, PDF (1/11 Pages) Intersil Corporation – Micropower, Single Supply, Rail-to-Rail Input-Output Instrumentation Amplifiers

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Data Sheet
EL8171, EL8172
March 9, 2006
FN6293.1
Micropower, Single Supply, Rail-to-Rail
Input-Output Instrumentation Amplifiers
The EL8171 and EL8172 are micropower instrumentation
amplifiers optimized for operation at 2.9V to 5V single
supplies. 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 or positive supply - no
pull-up or pull-down resistors are needed.
Pinout
EL8171, EL8172
(8 LD SO)
TOP VIEW
ENABLE 1
+
-
8 FB+
IN- 2
-
+
Σ
7 VS+
IN+ 3
6 OUT
VS- 4
5 FB-
Features
• 78µA maximum supply current
• Maximum input offset voltage
- 300µV (EL8172)
- 1000µV (EL8171)
• 200pA maximum input bias current
• 3µV/°C offset voltage drift
• 450kHz -3dB bandwidth (G = 10)
• 170kHz -3dB bandwidth (G = 100)
• 0.5V/µs slew rate
• Single supply operation
- Input voltage range is rail-to-rail
- Output swings rail-to-rail
• Output sources and sinks ±29mA load current
• 0.2% gain accuracy
• Pb-free plus anneal available (RoHS compliant)
Applications
• Battery- or solar-powered systems
• Strain gauges
• Current monitors
• Thermocouple amplifiers
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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