Overview
Features and Benefits
- Low Noise:
- 0.25ppmP-P (0.1Hz to 10Hz) 625nVP-P for the LTC6655-2.5
- 0.21ppmRMS (10Hz to 1kHz) for the LTC6655LN CNR = 100µF
- Low Drift: 2ppm/°C Max
- High Accuracy: ±0.025% Max
- No Humidity Sensitivity (LS8 Package)
- Thermal Hysteresis (LS8): 30ppm (–40°C to 85°C)
- Long-Term Drift (LS8): 20ppm/√kHr
- 100% Tested at –40°C, 25°C and 125°C
- Load Regulation: <10ppm/mA
- Sinks and Sources Current: ±5mA
- Low Dropout: 500mV
- Maximum Supply Voltage: 13.2V
- Low Power Shutdown: <20µA Max
- Available Output Voltages: 1.25V, 2.048V, 2.5V, 3V, 3.3V, 4.096V, 5V
- Available in an 8-Lead MSOP and High Stability Hermetic 5mm × 5mm LS8 Packages
Product Details
The LTC6655 is a complete family of precision bandgap voltage references, offering exceptional noise and drift performance. This low noise and drift is ideally suited for the high resolution measurements required by instrumentation and test equipment. In addition, the LTC6655 is fully specified over the temperature range of –40°C to 125°C, ensuring its suitability for demanding automotive and industrial applications. Advanced curvature compensation allows this bandgap reference to achieve a drift of less than 2ppm/°C with a predictable temperature characteristic and an output voltage accurate to ±0.025%, reducing or eliminating the need for calibration.
The LTC6655LN Low Noise comes with a noise reduction pin that enables reduction of wideband noise with the addition of a single capacitor.
The LTC6655 can be powered from as little as 500mV above the output voltage to as much as 13.2V. Superior load regulation with source and sink capability, coupled with exceptional line rejection, ensures consistent performance over a wide range of operating conditions. A shutdown mode is provided for low power applications.
The LTC6655 references are offered in an 8-lead MSOP package and an 8-lead LS8 package. The LS8 is a 5mm × 5mm surface mount hermetic package that provides outstanding stability.
APPLICATIONS
- Instrumentation and Test Equipment
- High Resolution Data Acquisition Systems
- Weigh Scales
- Precision Battery Monitors
- Precision Regulators
- Medical Equipment
Product Categories
Markets and Technologies
Product Lifecycle
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.
Evaluation Kits (35)
Documentation & Resources
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R528 Reliability Data3/26/2018PDF34 K
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AN167f - Buffered ADC Family Eliminates Signal Conditioning Complexity9/20/2017PDF1M
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AN-124: 775 Nanovolt Noise Measurement for A Low Noise Voltage Reference7/10/2009PDF467 K
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User Guide: ADMX1002, Ultra-low Distortion and Low Noise Signal Generator4/16/2021WIKI
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DC2095A - Demo Manual3/27/2015PDF419K
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DC1925A - Demo Manual4/10/2013PDF3M
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DC1783A - Demo Manual3/13/2013PDF1M
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DC1805A - Demo Manual5/16/2012PDF753K
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DC1826A - Demo Manual4/24/2012PDF939K
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DC1813A - Demo Manual11/7/2011PDF2M
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DN229 - Don't Be Fooled By Voltage Reference Long-Term Drift and Hysteresis8/5/2014PDF95K
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DN494 - Driving a Low Noise, Low Distortion 18-Bit, 1.6Msps ADC9/14/2012PDF1M
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Precision Voltage References6/23/2017PDF1M
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18-Bit 1.6Msps SAR ADC 101dB SNR11/4/2011PDF877K
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Go to 4.096V and Stay There.8/26/2013PDF907K
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Precision Narrow Bandwidth Signal Chain Solutions10/20/2022
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ADI's Precision Wide Bandwidth Low Latency Measurement and Drive7/5/2022
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Design Faster With ADI’s Precision Wide Bandwidth Signal Chains6/28/2022
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Innovation Pushes State-of-the-Art in Voltage References10/15/2018
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775nV Low Noise Voltage Reference Measurement Techniques - LTC665510/15/2018
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Voltage Reference: Performance Plus Features10/15/2018
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LTC6655 Video Product Brief10/15/2018
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High Performance Source for ADC and Audio Test with Novel Digital Predistortion2/24/2022
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Why Does Voltage Reference Noise Matter?3/1/2020 Analog Dialogue
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Does My Voltage Reference Design Hold Water? Methods of Managing Humidity and Performance in Precision Analog Systems9/1/2019 Analog Dialogue
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Reference Filter Increases 32-Bit ADC SNR by 6dB9/26/2017
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Single-Ended to Differential Driver Circuit for the LTC2387-18 SAR ADC9/26/2016
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Digital Gain Compression (DGC) for SAR ADCs3/11/2014
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ADC Driving: Single-Ended To Differential Conversion9/5/2013
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ADC Driving: Pseudo-Differential Unipolar or Bipolar Inputs8/28/2013
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Can You Use the Voltage Reference to Power Your ADC Driver?7/11/2013
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775 Nanovolt Noise Measurement for A Low Noise Voltage Reference7/1/2009 LT Journal
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Reliable Precision Voltage Reference with 5ppm/°C Drift is Factory Trimmed and Tested at1/1/2009 LT Journal
–40°C, 25°C and 125°C
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

LTspice Simulations
Models for the following parts are available in LTspice:
Reference Designs (3)
Product Recommendations
LTC6655 Companion Parts
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.View our quality and reliability program and certifications for more information.
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Sample & Buy
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.