EL8172

Features:

• 78A maximum supply current
• Maximum input offset voltage
- 300V (EL8172)
- 1000V (EL8171)
• 200pA maximum input bias current
• 3V/°C offset voltage drift
• 450kHz -3dB bandwidth (G = 10)
• 170kHz -3dB bandwidth (G = 100)
• 0.5V/s 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)




Application

• Battery- or solar-powered systems
• Strain gauges
• Current monitors
• Thermocouple amplifiers




Specifications

Supply Voltage, VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V
Differential Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5V
VEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5V to VS+ + 0.5V
ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3kV
Output Short-Circuit Duration . . . . . . . . . . . . . . . . . . . . . . Indefinite
Ambient Operating Temperature . . . . . . . . . . . . . ..-40°C to +85°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C

CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.




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.