LT1101 Precision, Micropower, Single Supply Instrumentation Amplifier (Fixed Gain = 10 or 100) UFEATURESDESCRIPTIO ■ Gain Error: 0.04% Max The LT®1101 establishes the following milestones: ■ Gain Nonlinearity: 0.0008% (8ppm) Max (1) It is the first micropower instrumentation amplifier, ■ Gain Drift: 4ppm/°C Max (2) It is the first single supply instrumentation amplifier, ■ Supply Current: 105µA Max (3) It is the first instrumentation amplifier to feature fixed ■ Offset Voltage: 160µV Max gains of 10 and/or 100 in low cost, space-saving 8-lead ■ Offset Voltage Drift: 0.4µV/°C Typ packages. ■ Offset Current: 600pA Max The LT1101 is completely self-contained: no external gain ■ CMRR, G = 100: 100dB Min setting resistor is required. The LT1101 combines its ■ 0.1Hz to 10Hz Noise: 0.9µVp-p Typ micropower operation (75µA supply current) with a 2.3pAp-p Typ gain error of 0.008%, gain linearity of 3ppm, gain drift of ■ Gain Bandwidth Product: 250kHz Min 1ppm/°C. The output is guaranteed to drive a 2k load to ■ Single or Dual Supply Operation ±10V with excellent gain accuracy. ■ Surface Mount Package Available Other precision specifications are also outstanding: 50µV input offset voltage, 130pA input offset current, and U low drift (0.4µV/°C and 0.7pA/°C).
In addition, unlike other APPLICATIO S instrumentation amplifiers, there is no output offset ■ Differential Signal Amplification in Presence of voltage contribution to total error. Common Mode Voltage A full set of specifications are provided with ±15V dual ■ Micropower Bridge Transducer Amplifier supplies and for single 5V supply operation. The LT1101 – Thermocouples can be operated from a single lithium cell or two Ni-Cad – Strain Gauges batteries. Battery voltage can drop as low as 1.8V, yet the – Thermistors LT1101 still maintains its gain accuracy. In single supply ■ Differential Voltage-to-Current Converter applications, both input and output voltages swing ■ Transformer Coupled Amplifier to within a few millivolts of ground. The output sinks ■ 4mA to 20mA Bridge Transmitter current while swinging to ground—no external, power , LTC and LT are registered trademarks of Linear Technology Corporation. consuming pull down resistors are needed. UTYPICAL APPLICATIOGain Error Distribution 1 8 30 GROUND G = 100 OUTPUT (REF) RL = 50k 90R 90R 25 TA = 25°C 930 UNITS SHORT TO 1, 2 7 SHORT TO 8 TESTED G = 10 G = 10 20 IN ALL PACKAGES N.C. G = 100 N.C. G = 100 9R 9R R R 15 – 10 – PERCENT OF UNITS A B INVERTING 3 + 6 NONINVERTING 5 + R ≈ 9.2k INPUT INPUT 4 5 0 V+ V– –0.04 –0.03 –0.02 –0.01 0 0.01 0.02 0.03 0.04 GROUND PIN 1, OUTPUT AT PIN 8 GAIN ERROR (%) G = 100: NO ADDITIONAL CONNECTIONS G = 10: SHORT PIN 2 TO PIN 1, SHORT PIN 7 TO PIN 8 LT1101 • TA01 LT1101 • TA02 1101fa 1
