LTC1250 - Very Low Noise Zero-Drift Bridge Amplifier

Features

  • Very Low Noise: 0.75µVP-P Typ, 0.1Hz to 10Hz
  • DC to 1Hz Noise Lower Than OP-07
  • Full Output Swing into 1k Load
  • Offset Voltage: 10µV Max
  • Offset Voltage Drift: 50nV/°C Max
  • Common Mode Rejection Ratio: 110dB Min
  • Power Supply Rejection Ratio: 115dB Min
  • No External Components Required
  • Pin Compatible with Standard 8-Pin Op Amps
  • Available in Standard 8-Pin Plastic DIP and 8-Pin SO Packages

Typical Application

LTC1250 Typical Application
LTC1250 Typical Application

Description

The LTC®1250 is a high performance, very low noise zerodrift operational amplifier. The LTC1250's combination of low front-end noise and DC precision makes it ideal for use with low impedance bridge transducers. The LTC1250 features typical input noise of 0.75µVP-P from 0.1Hz to 10Hz, and 0.2µVP-P from 0.1Hz to 1Hz. The LTC1250 has DC to 1Hz noise of 0.35µVP-P, surpassing that of low noise bipolar parts including the OP-07, OP-77, and LT1012. The LTC1250 uses the industry-standard single op amp pinout, and requires no external components or nulling signals, allowing it to be a plug-in replacement for bipolar op amps.

The LTC1250 incorporates an improved output stage capable of driving 4.3V into a 1k load with a single 5V supply; it will swing ±4.9V into 5k with ±5V supplies. The input common mode range includes ground with single power supply voltages above 12V. Supply current is 3mA with a ±5V supply, and overload recovery times from positive and negative saturation are 0.5ms and 1.5ms, respectively. The internal nulling clock is set at 5kHz for optimum low frequency noise and offset drift; no external connections are necessary.

The LTC1250 is available in a standard 8-pin plastic DIP and 8-pin SO packages.

Protected by U.S. Patents including 4933642.

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
LTC1250CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LTC1250CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1250CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes


LTC1250 Package Drawing
LTC1250 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
LTC1250CN8#PBF N-8 C $3.70 $2.85 Yes
LTC1250CS8#PBF SO-8 C $4.20 $3.25 Yes
LTC1250CS8#TRPBF SO-8 C $3.31 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.

Part Number Description Price Documentation
DC417B DIP8, MS8, S8, SOT23-6 | Multi-Footprint General Purpose Board for Single Op. Amp $25.00
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Click here to view our complete list of demo boards

Applications

  • Electronic Scales
  • Strain Gauge Amplifiers
  • Thermocouple Amplifiers
  • High Resolution Data Acquisition
  • Low Noise Transducers
  • Instrumentation Amplifiers

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LTC1250

Technical Support