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
LT1101 Typical Application
LT1101 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
LT1101 Package Drawing
LT1101 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT1101ACN8#PBFN-8C$8.17$6.60
LT1101AIN8#PBFN-8I$10.17$8.35
LT1101CN8#PBFN-8C$5.83$4.75
LT1101IN8#PBFN-8I$7.25$5.95
LT1101ISW#PBFSW-16I$8.65$6.90
LT1101ISW#TRPBFSW-16I$6.96
LT1101SW#PBFSW-16C$7.00$5.70
LT1101SW#TRPBFSW-16C$5.76
Datasheet
Application Note
Design Note
Reliability Data
CAD Symbol
Related Products
LT1101 - Precision, Micropower, Single Supply Instrumentation Amplifier (Fixed Gain = 10 or 100)
AN43 - Bridge Circuits
AN67 - Linear Technology Magazine Circuit Collection, Volume III
DN40 - Designing with a New Family of Instrumentation Amplifiers
DN45 - Signal Conditioning for Platinum Temperature Transducers
DN56 - 3V Operation of Linear Technology Op Amps
R046 Reliability Data
LT1101 Footprints and Symbols