INA115

® INA 115 INA115 Precision INSTRUMENTATION AMPLIFIER FEATURES q LOW OFFSET VOLTAGE: 50µV max q LOW DRIFT: 0.25µV/°C max q LOW INPUT BIAS CURRENT: 2nA max q HIGH COMMON-MODE REJECTION: 115dB min q INPUT OVER-VOLTAGE PROTECTION: ±40V q WIDE SUPPLY RANGE: ±2.25 TO ±18V q LOW QUIESCENT CURRENT: 3mA max q SOL-16 SURFACE-MOUNT PACKAGE DESCRIPTION The INA115 is a low cost, general purpose instrumentation amplifier offering excellent accuracy. Its versatile three-op amp design and small size make it ideal for a wide range of applications. Similar to the model INA114, the INA115 provides additional connections to the input op amps, A1 and A2, which improve gain accuracy in high gains and are useful in forming switched-gain amplifiers. A single external resistor sets any gain from 1 to 10,000. Internal input protection can withstand up to ±40V without damage. The INA115 is laser trimmed for very low offset voltage (50µV), drift (0.25µV/˚C) and high commonmode rejection (115dB at G=1000). It operates with power supplies as low as ±2.25V, allowing use in battery operated and single 5V supply systems. Quiescent current is 3mA maximum. The INA115 is available in the SOL-16 surface-mount package, specified for the –40°C to +85°C temperature range. VO1 1 V+ 13 INA115 Feedback A1 25kΩ 25kΩ 25kΩ 12 APPLICATIONS q SWITCHED-GAIN AMPLIFIER q BRIDGE AMPLIFIER q THERMOCOUPLE AMPLIFIER q RTD SENSOR AMPLIFIER q MEDICAL INSTRUMENTATION q DATA ACQUISITION – VIN 4 2 3 Over-Voltage Protection R...