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AD8641/AD8642/AD8643: Low Power, Rail-to-Rail Output, Precision JFET Amplifiers Data Sheet (Rev. F)1/9/2013PDF315 K
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AD8643-EP: Enhanced Product Data Sheet (Rev. 0)1/9/2013PDF249 kB
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AD8643-DSCC: Military Data Sheet1/9/2013
Overview
Features and Benefits
- Low Supply Current/Amp: 250 µA max
- Very Low Input Bias Current: 1 pA max
- Low Offset Voltage: 750 µV max
- Single-supply Operation: 5 V to 26 V
- Dual-supply Operation: ±2.5 V to ±13 V
- Rail-to-rail Output
- Unity Gain Stable
- 3mm x 3mm LFCSP and SOIC
- Download AD8643-EP data sheet (pdf)
- Military temperature range (−55°C to +125°C)
- Controlled manufacturing baseline
- 1 assembly/test site
- 1 fabrication site
- Enhanced product change notification
- Qualification data available on request
- V62/12653 DSCC Drawing Number
Product Details
The AD8641/AD8642/AD8643 are low power, precision JFET input amplifier featuring low input bias current and rail-to-rail output. The AD8641 family provides high source impedance, low bias current and low supply current which are key to applications such as ECG/EKG monitors, sleep monitoring, and blood analyzing instruments. The ability to swing rail-to-rail at the output enables designers to buffer wide output swing devices in single supply systems.
The AD8641 family is also ideal for applications utilizing multi-channel boards that require low power to manage heat. Other applications include photodiodes, ATE reference level drivers, battery management, and industrial controls.
The AD8641 family is fully specified over the extended industrial temperature range of –40° to +125°C. The AD8641 is available in 5-lead SC70 and 8-lead SOIC packages. The AD8642 is available in 8-lead MSOP and 8-lead SOIC packages. The AD8643 is available in 16-lead 3mm x 3mm LFCSP and 14-lead SOIC packages.
Applications
- Medical Instrumentation
- Photodiode Amplifiers
- Precision Current Sensing
- Battery-powered Instruments
- Precision Filters
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 (1)
Documentation & Resources
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.
Models for the following parts are available in LTspice:
AD8643
SPICE Models
CIR
AD8643 SPICE Macro Model
3.41 K
Design Tools
Analog Filter Wizard
Use the Analog Filter Wizard to design low-pass, high-pass, or band-pass filters with actual op amps in minutes. As you progress through the design process, you can observe the characteristics of your filter design from ideal specifications to real world circuit behavior. Quickly evaluate the tradeoffs in op amp specifications - including gain-bandwidth, noise, and supply current – to determine the best filter design for your requirements.
Analog Photodiode Wizard
Use Photodiode Wizard to design a transimpedance amplifier circuit to interface with a photodiode. Select a photodiode from the library included in the tool, or enter custom photodiode specifications. Quickly observe tradeoffs between Bandwidth, Peaking (Q), and ENOB/SNR. Modify circuit parameters, and immediately see results in plots for pulse response, frequency response, and noise gain.
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 |
|---|---|---|---|---|
| AD8643ACPZ-REEL7 | Material Declaration | Reliability Data | 16-Lead LFCSP (3mm x 3mm w/ EP) | |
| AD8643ARZ | Material Declaration | Reliability Data | 14-Lead SOIC | |
| AD8643ARZ-REEL7 | Material Declaration | Reliability Data | 14-Lead SOIC | |
| AD8643TRZ-EP | Material Declaration | Reliability Data | 14-Lead SOIC | |
| AD8643TRZ-EP-R7 | Material Declaration | Reliability Data | 14-Lead SOIC | |
| Wafer Fabrication Data |
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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.