EL8172

Micropower, Single Supply, Rail-to-Rail Input-Output Instrumentation Amplifiers

OVERVIEW

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.

KEY 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)

PARAMETRICS

Parameters
EL8172
Basic Information
Production Status
Mass Production
# of Devices/ Channels
1
Bandwidth (MHz)
0.17
Slew Rate (V/μs)
0.55
VS (min)
2.4 V
VS (max)
5.5 V
IS (per amp)
0.095 mA
Noise VN (nV/√Hz)
80
IBIAS
10 pA
Max Offset Voltage
0.3 mV
IOUT
26 mA
VOUT (V)
4.99
Rail-to-Rail Input
Yes
Rail-to-Rail Output
Yes
PSRR (dB)
104
CMRR (dB)
100
Gain Min
100
Enable
No
Gain Error/Measurment Error Max
0.2
Qualification Level
Standard
Temperature Range
-40 to +125

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