LT1168 - Low Power, Single Resistor Gain Programmable, Precision Instrumentation Amplifier

Features

  • Supply Current: 530µA Max
  • Meets IEC 1000-4-2 Level 4 (±15kV) ESD Tests with Two External 5k Resistors
  • Single Gain Set Resistor: G = 1 to 10,000
  • Gain Error: G = 10, 0.4% Max
  • Input Offset Voltage Drift: 0.3µV/°C Max
  • Gain Nonlinearity: G = 10, 20ppm Max
  • Input Offset Voltage: 40µV Max
  • Input Bias Current: 250pA Max
  • PSRR at AV =1: 103dB Min
  • CMRR at AV = 1: 90dB Min
  • Wide Supply Range: ±2.3V to ±18V
  • 1kHz Voltage Noise: 10nV/rtHz
  • 0.1Hz to 10Hz Noise: 0.28µVP-P
  • Available in 8-Pin PDIP and SO Packages

Typical Application

LT1168 Typical Application
LT1168 Typical Application

Description

The LT®1168 is a micropower, precision instrumentation amplifier that requires only one external resistor to set gains of 1 to 10,000. The low voltage noise of 10nV/rtHz (at 1kHz) is not compromised by low power dissipation (350µA typical for ±15V supplies). The wide supply range of ±2.3V to ±18V allows the LT1168 to fit into a wide variety of industrial as well as battery-powered applications.

The high accuracy of the LT1168 is due to a 20ppm maximum nonlinearity and 0.4% max gain error (G = 10). Previous monolithic instrumentation amps cannot handle a 2k load resistor whereas the nonlinearity of the LT1168 is specified for loads as low as 2k. The LT1168 is laser trimmed for very low input offset voltage (40µV max), drift (0.3µV/°C), high CMRR (90dB, G = 1) and PSRR (103dB, G = 1). Low input bias currents of 250pA max are achieved with the use of superbeta processing. The output can handle capacitive loads up to 1000pF in any gain configuration while the inputs are ESD protected up to 13kV (human body). The LT1168 with two external 5k resistors passes the IEC 1000-4-2 level 4 specification.

The LT1168 is a pin-for-pin improved second source for the AD620 and INA118. The LT1168, offered in 8-pin PDIP and SO packages, requires significantly less PC board area than discrete op amp resistor designs. These advantages make the LT1168 the most cost effective solution for precision instrumentation amplifier applications.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT1168ACN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1168ACS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1168ACS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1168AIN8#PBF N-8 N I 05-08-1510 (N8) Yes
LT1168AIS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1168AIS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1168CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1168CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1168CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1168IN8#PBF N-8 N I 05-08-1510 (N8) Yes
LT1168IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1168IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LT1168 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT1168ACN8#PBF N-8 C $7.10 $6.05 Yes
LT1168ACS8#PBF SO-8 C $7.10 $6.05 Yes
LT1168ACS8#TRPBF SO-8 C $6.11 Yes
LT1168AIN8#PBF N-8 I $8.15 $6.95 Yes
LT1168AIS8#PBF SO-8 I $8.15 $6.95 Yes
LT1168AIS8#TRPBF SO-8 I $7.00 Yes
LT1168CN8#PBF N-8 C $4.35 $3.70 Yes
LT1168CS8#PBF SO-8 C $4.35 $3.70 Yes
LT1168CS8#TRPBF SO-8 C $3.76 Yes
LT1168IN8#PBF N-8 I $5.00 $4.25 Yes
LT1168IS8#PBF SO-8 I $5.00 $4.25 Yes
LT1168IS8#TRPBF SO-8 I $4.31 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • Bridge Amplifiers
  • Strain Gauge Amplifiers
  • Thermocouple Amplifiers
  • Differential to Single-Ended Converters
  • Differential Voltage to Current Converters
  • Data Acquisition
  • Battery-Powered and Portable Equipment
  • Medical Instrumentation
  • Scales

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Design Tools

LTspice

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Models for the following parts are available in LTspice:
LT1168

Technical Support