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AD8420
RECOMMENDED FOR NEW DESIGNSWide Supply Range, Micropower, Rail-to-Rail Instrumentation Amplifier
- Part Models
- 3
- 1ku List Price
- Starting From $1.05
Part Details
- 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
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
Documentation
Data Sheet 1
User Guide 1
Application Note 1
Technical Book 1
Circuit Note 1
Rarely Asked Question Page 1
Analog Dialogue 2
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 Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD8420ARMZ | 8-Lead MSOP | ||
| AD8420ARMZ-R7 | 8-Lead MSOP | ||
| AD8420ARMZ-RL | 8-Lead MSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jan 5, 2015 - 14_0246 Qualification of ASE Chungli, as an Alternate Assembly Site for Select MSOP Devices |
||
| AD8420ARMZ | PRODUCTION | |
| AD8420ARMZ-R7 | PRODUCTION | |
| AD8420ARMZ-RL | PRODUCTION | |
|
Dec 15, 2014 - 14_0269 AD8420 Data Sheet Change |
||
| AD8420ARMZ | PRODUCTION | |
| AD8420ARMZ-R7 | PRODUCTION | |
| AD8420ARMZ-RL | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
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.
Open ToolSPICE Model 1
Evaluation Kits
AD8237 and AD8420 Evaluation Board
Resources
Reference Designs
Configurable 4-20 mA Loop Powered Transmitter/Receiver using a Micropower Instrumentation Amplifier
Part Used
Design & Integration Tools
Low Power, Temperature Compensated Bridge Signal Conditioner and Driver