AD8420
Wide Supply Range, Micropower, Rail-to-Rail Instrumentation Amplifier
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Overview
Features and Benefits
- Maximum supply current:
90 μA - Minimum CMRR: 100 dB
- Drives heavy capacitive loads:
~700 pF - Rail-to-rail output
- Input voltage range goes below ground
- Gain set with 2 external resistors
Can achieve low gain drift at any gain - Very wide power supply range
Single supply: 2.7 V to 36 V
Dual supply: ±2.7 V to ±18 V - Bandwidth (G = 100): 2.5 kHz
- Input voltage noise: 55 nV/√Hz
- See data sheet for additional features
Product Details
The AD8420 is a low cost, micropower, wide supply range, instrumentation amplifier with a rail-to-rail output and a novel architecture that allows for extremely flexible design. It is optimized to amplify small differential voltages in the presence of large common-mode signals.
The AD8420 is based on an indirect current feedback architecture that gives it an excellent input common-mode range. Unlike conventional instrumentation amplifiers, the AD8420 can easily amplify signals at or even slightly below ground without requiring dual supplies. The AD8420 has rail-to-rail output, and the output voltage swing is completely independent of the input common-mode voltage.
Single-supply operation, micropower current consumption, and rail-to-rail output swing make the AD8420 ideal for battery-powered applications. Its rail-to-rail output stage maximizes dynamic range when operating from low supply voltages. Dual-supply operation (±15 V) and low power consumption make the AD8420 ideal for a wide variety of applications in medical or industrial instrumentation.
The AD8420 is available in an 8-lead MSOP package. Performance is specified over the full temperature range of −40°C to +85°C, and the part is operational from −40°C to +125°C
APPLICATIONS
- Bridge amplifiers
- Pressure Measurement
- Medical instrumentation
- Portable data acquisition
- Multichannel systems
Product Categories
Markets and Technologies
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Documentation & Resources
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The Diamond Plot7/1/2014
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How to Stay Out of Deep Water when Designing with Bridge Sensors1/1/2014 Analog Dialogue
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Making Batteries Last Longer with Fast, High-Precision SAR Analog-to-Digital-Converters9/1/2012 Analog Dialogue
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.
SPICE Model
CIR
AD8420 SPICE Macro Model
4.98 K
Reference Designs (2)
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 |
|---|---|---|---|---|
| AD8420ARMZ | Material Declaration | Reliability Data | 8-Lead MSOP | |
| AD8420ARMZ-R7 | Material Declaration | Reliability Data | 8-Lead MSOP | |
| AD8420ARMZ-RL | Material Declaration | Reliability Data | 8-Lead MSOP | |
| Wafer Fabrication Data |
PCN-PDN Information
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Support & Discussions
AD8420 Discussions
Sample & Buy
Ordering FAQs
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Buy Now Pricing
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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
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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.