AD621
Low Drift, Low Power Instrumentation Amp with fixed gains of 10 and 100
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Overview
Features and Benefits
- Easy To Use
Pin-Strappable Gains of 10 and 100
All Errors Specified for Total System Performance
High Performance than Discrete In Amp Designs
Available in 8-Lead DIP and SOIC
Low Power, 1.3 mA Max Supply Current
Wide Power Supply - Low Noise
9 nV/vHz, @ 1 kHz, Input Voltage Noise
0.28 µV p-p Noise (0.1 Hz to 10 Hz) - Excellent DC Performance
0.15% Max, Total Gain Error
±5 ppm/°C, Total Gain Drift
125 µV Max, Total Offset Voltage
1.0 µV/°C Max, Offset Voltage Drift - Excellent AC Specifications
800 kHz Bandwidth (G = 10),
200 kHz (G = 100)
12 µs Settling Time to 0.01%
Product Details
The AD621 is an easy to use, low cost, low power, high accuracy instrumentation amplifier which is ideally suited for a wide range of applications. Its unique combination of high performance, small size and low power, outperforms discrete in amp implementations. High functionality, low gain errors and low gain drift errors are achieved by the use of internal gain setting resistors. Fixed gains of 10 and 100 can be easily set via external pin strapping. The AD621 is fully specified as a total system, therefore, simplifying the design process.
For portable or remote applications, where power dissipation, size and weight are critical, the AD621 features a very low supply current of 1.3 mA max and is packaged in a compact 8-pin SOIC, 8-pin plastic DIP or 8-pin cerdip. The AD621 also excels in applications requiring high total accuracy, such as precision data acquisition systems used in weigh scales and transducer interface circuits. Low maximum error specifications including nonlinearity of 10 ppm, gain drift of 5 ppm°/C, 50 µV offset voltage and 0.6 mV/°C offset drift ("B" grade), make possible total system performance at a lower cost than has been previously achieved with discrete designs or with other monolithic instrumentation amplifiers.
When operating from high source impedances, as in ECG and blood pressure monitors, the AD621 features the ideal combination of low noise and low input bias currents. Voltage noise is specified as 9 nV/(root) Hz at 1 kHz and 0.28 µV p-p from 0.1 Hz to 10 Hz. Input current noise is also extremely low at 0.1 pA/
Product Categories
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
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AN-1401: Instrumentation Amplifier Common-Mode Range: The Diamond Plot (Rev. 0)10/14/2016
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AN-282: Fundamentals of Sampled Data Systems2/14/2015
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AN-214: Ground Rules for High Speed Circuits2/14/2015
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AN-589: Ways to Optimize the Performance of a Difference Amplifier (Rev. B)2/14/2015
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AN-244: A User's Guide to I.C. Instrumentation Amplifiers11/23/2004
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AN-245: Instrumentation Amplifiers Solve Unusual Design Problems11/23/2004
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AN-671: Reducing RFI Rectification Errors in In-Amp Circuits (Rev. 0)11/23/2004
Tools & Simulations
In-Amp Diamond Plot Tool
The Diamond Plot Tool is a web application that generates a configuration-specific Output Voltage Range vs. Input Common-Mode Voltage graph, also known as the Diamond Plot, for Analog Devices Instrumentation Amplifiers. Based on user inputs such as supply voltage, gain, and input signal range, the tool detects saturation and recommends in-amps for which the input signal is in-range and the configuration is valid. Avoid saturation, find the best in-amp for your design, and save time.
Design Tools
In-Amp Error Calculator
These tools will help estimate error contributions in your instrumentation amplifier circuit. It uses input parameters such as temperature, gain, voltage input, and source impedance to determine the errors that can contribute to your overall design.
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 |
|---|---|---|---|---|
| AD621ANZ | Material Declaration | Reliability Data | 8-Lead PDIP | |
| AD621ARZ | Material Declaration | Reliability Data | 8-Lead SOIC | |
| AD621ARZ-R7 | Material Declaration | Reliability Data | 8-Lead SOIC | |
| AD621ARZ-RL | Material Declaration | Reliability Data | 8-Lead SOIC | |
| AD621BNZ | Material Declaration | Reliability Data | 8-Lead PDIP | |
| AD621BRZ | Material Declaration | Reliability Data | 8-Lead SOIC | |
| AD621BRZ-R7 | Material Declaration | Reliability Data | 8-Lead SOIC | |
| AD621BRZ-RL | Material Declaration | Reliability Data | 8-Lead SOIC | |
| AD621SQ/883B | Material Declaration | Reliability Data | 8-Lead CerDIP | |
| Wafer Fabrication Data |
PCN-PDN Information
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Support & Discussions
AD621 Discussions
Sample & Buy
Ordering FAQs
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Buy Now Pricing
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List Pricing
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Lead Times
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Sampling
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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.