-
LT1028/LT1128: Ultralow Noise Precision High Speed Op Amps Data Sheet10/2/2017PDF712K
Overview
Features and Benefits
- Voltage Noise
- 1.1nV/√Hz Max. at 1kHz
- 0.85nV/√Hz Typ. at 1kHz
- 1.0nV/√Hz Typ. at 10Hz
- 35nVP-P Typ., 0.1Hz to 10Hz
- Gain-Bandwidth Product
- LT1028: 50MHz Min.
- LT1128: 13MHz Min.
- Slew Rate
- LT1028: 11V/µs Min.
- LT1128: 5V/µs Min.
- Offset Voltage: 40µV Max.
- Drift with Temperature: 0.8µV/°C Max.
- Voltage Gain: 7 Million Min.
- Voltage and Current Noise 100% Tested
- Available in 8-Pin SO Package
Product Details
The LT1028 (gain of –1 stable)/LT1128(gain of +1 stable) achieve a new standard of excellence in noise performance with 0.85nV/√Hz 1kHz noise, 1.0nV/√Hz 10Hz noise. This ultralow noise is combined with excellent high speed specifications (gain-bandwidth product is 75MHz for LT1028, 20MHz for LT1128), distortion-free output, and true precision parameters (0.1µV/°C drift, 10µV offset voltage, 30 million voltage gain). Although the LT1028/LT1128 input stage operates at nearly 1mA of collector current to achieve low voltage noise, input bias current is only 25nA.
The LT1028/LT1128’s voltage noise is less than the noise of a 50Ω resistor. Therefore, even in very low source impedance transducer or audio amplifier applications, the LT1028/LT1128’s contribution to total system noise will be negligible.
Applications
- Low Noise Frequency Synthesizers
- High Quality Audio
- Infrared Detectors
- Accelerometer and Gyro Amplifiers
- 350 ohms Bridge Signal Conditioning
- Magnetic Search Coil Amplifiers
- Hydrophone Amplifiers
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 (1)
Documentation & Resources
-
R041 Reliability Data3/26/2018PDF20 K
-
AN141 - Risk Assessment Advice for High Reliability Amplifiers10/7/2013PDF292K
-
AN45 - Measurement and Control Circuit Collection11/29/2012PDF1M
-
AN43 - Bridge Circuits7/10/2012PDF3M
-
AN21 - Composite Amplifiers5/4/2010PDF322K
-
AN57 - Video Circuit Collection9/4/2008PDF545K
-
AN48 - Using the LTC Op Amp Macromodels8/20/2007PDF289K
-
DC417B - Demo Manual2/1/2012PDF137K
-
DN15 - Noise Calculations in Op Amp Circuits6/28/2016PDF219K
-
DN3 - Operational Amplifier Selection Guide for Optimum Noise Performance6/28/2016PDF218K
-
DN140 - Updated Operational Amplifier Selection Guide for Optimum Noise Performance7/28/2014PDF72K
-
DN42 - Chopper vs Bipolar Op Amps—An Unbiased Comparison7/24/2014PDF68K
-
DN6 - Operational Amplifier Selection Guide for Optimum Noise Performance8/20/2007PDF133K
-
SAR ADC Drivers8/29/2016PDF276K
-
High Voltage Amplifiers9/10/2013PDF368K
-
Paralleling Amplifiers Improves Signal-to-Noise Performance7/9/2015
-
Locating Shorts on Power Planes of Multi-Layer PCBs8/7/2014
-
Consider New Precision Amplifiers for Updated Industrial Equipment Designs9/1/2009 LT Journal
-
SOT-23 10MHz Rail-to-Rail Op Amp Saves Board Space and Power11/1/2000 LT Journal
-
JFET Op Amps Equal Low Noise Bipolars and Have Picoamp Current Noise9/1/1999 LT Journal
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.

Models for the following parts are available in LTspice:
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.
Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
---|---|---|---|---|
LT1028ACN8#PBF | Material Declaration | Reliability Data | 8-Lead PDIP (Narrow 0.3 Inch) | |
LT1028CDICE | Material Declaration | Reliability Data | CHIPS OR DIE | |
LT1028CN8#PBF | Material Declaration | Reliability Data | 8-Lead PDIP (Narrow 0.3 Inch) | |
LT1028CS8#PBF | Material Declaration | Reliability Data | 8-Lead SOIC (Narrow 0.15 Inch) | |
LT1028CS8#TRPBF | Material Declaration | Reliability Data | 8-Lead SOIC (Narrow 0.15 Inch) | |
LT1028CSW#PBF | Material Declaration | Reliability Data | 16-Lead SOIC (Wide 0.3 Inch) | |
LT1028CSW#TRPBF | Material Declaration | Reliability Data | 16-Lead SOIC (Wide 0.3 Inch) | |
Wafer Fabrication Data | R041 Reliability Data |
PCN-PDN Information
Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.
Sample & Buy
Ordering FAQs
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
Please see the latest communication from our CCO regarding lead times.
Sampling
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.
Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
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.