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LT1101 - Precision, Micropower, Single Supply Instrumentation Amplifier (Fixed Gain = 10 or 100)

The LT1101 establishes the following milestones: (1) It is the first micropower instrumentation amplifier, (2) It is the first single supply instrumentation amplifier, (3) It is the first instrumentation amplifier to feature fixed gains of 10 and/or 100 in low cost, space-saving 8-lead packages.

The LT1101 is completely self-contained: no external gain setting resistor is required. The LT1101 combines its micropower operation (75µA supply current) with again error of 0.008%, gain linearity of 3ppm, gain drift of 1ppm/°C. The output is guaranteed to drive a 2k load to ±10V with excellent gain accuracy.

Other precision specifications are also outstanding: 50µV input offset voltage, 130pA input offset current, and low drift (0.4µV/°C and 0.7pA/°C). In addition, unlike other instrumentation amplifiers, there is no output offset voltage contribution to total error.

A full set of specifications are provided with ±15V dual supplies and for single 5V supply operation. The LT1101 can be operated from a single lithium cell or two Ni-Cad batteries. Battery voltage can drop as low as 1.8V, yet the LT1101 still maintains its gain accuracy. In single supply applications, both input and output voltages swing to within a few millivolts of ground. The output sinks current while swinging to ground?no external, power consuming pull down resistors are needed.

Features Gain Error: 0.04% Max Gain Non-Linearity: 0.0008% (8ppm) Max Gain Drift: 4ppm/°C Max Supply Current: 105µA Max Offset Voltage: 160µV Max Offset Voltage Drift: 0.4µV/°C Typ Offset Current: 600pA Max CMRR, G=100: 100dB Min 0.1Hz to 10Hz Noise: 0.9µVp-p: 2.3pAp-p Typ Gain Bandwidth Product: 250kHz Min Single or Dual Supply Operation Surface Mount Package Available Typical Application

Applications Differential Signal Amplification in Presence of Common-Mode Voltage Micropower Bridge Transducer Amplifier-Thermocouples-Strain Gauges-Thermistors Differential Voltage to Current Converter Transformer Coupled Amplifier 4mA-20mA Bridge Transmitter Packaging