Overview

Features and Benefits

  • Single Gain Set Resistor: G = 1 to 10,000
  • Gain Error: G = 10, 0.3% Max
  • Gain Nonlinearity: G = 10, 30ppm Max
  • Input Offset Voltage: G = 10, 225µV Max
  • Input Offset Voltage Drift: 1µV/°C Max
  • Input Bias Current: 2nA Max
  • PSRR at G = 1: 80dB Min
  • CMRR at G = 1: 75dB Min
  • Supply Current: 1.3mA Max
  • Wide Supply Range: ±2.3V to ±18V
  • 1kHz Voltage Noise: 7.5nV/√Hz
  • 0.1Hz to 10Hz Noise: 0.28µVP-P
  • Available in 8-Pin PDIP and SO Packages
  • Meets IEC 1000-4-2 Level 4 ESD Tests with Two External 5k Resistors

Product Details

The LT1920 is a low power, precision instrumentation amplifier that requires only one external resistor to set gains of 1 to 10,000. The low voltage noise of 7.5nV/√Hz (at 1kHz) is not compromised by low power dissipation (0.9mA typical for ±2.3V to ±15V supplies).

The high accuracy of 30ppm maximum nonlinearity and 0.3% max gain error (G = 10) is not degraded even for load resistors as low as 2k (previous monolithic instrumentation amps used 10k for their nonlinearity specifications). The LT1920 is laser trimmed for very low input offset voltage (125µV max), drift (1µV/°C), high CMRR (75dB, G = 1) and PSRR (80dB, G = 1). Low input bias currents of 2nA 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 LT1920 with two external 5k resistors passes the IEC 1000-4-2 level 4 specification.

The LT1920, offered in 8-pin PDIP and SO packages, is a pin for pin and spec for spec improved replacement for the AD620. The LT1920 is the most cost effective solution for precision instrumentation amplifier applications. For even better guaranteed performance, see the LT1167.

Applications

  • Bridge Amplifiers
  • Strain Gauge Amplifiers
  • Thermocouple Amplifiers
  • Differential to Single-Ended Converters
  • Medical Instrumentation

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTspice

Models for the following parts are available in LTspice:

LT1920

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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