Overview
Description
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)
Comparison
Applications
- Battery- or solar-powered systems
- Strain gauges
- Current monitors
- Thermocouple amplifiers
Design & Development
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.
Processing table
| SOICN | Tube | ||
| SOICN | Reel | ||
| SOICN | Reel |
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