Alternative Parts
LTC2057
LTC2057HV
Higher supply 60V, better precision, lower voltage noise, higher bandwidth, shutdown option available
Overview
Features and Benefits
- Low offset voltage: 9 μV maximum
- Offset drift: 0.04 μV/°C maximum
- Rail-to-rail output swing
- 5 V to 16 V single-supply or ±2.5 V to ±8 V dual-supply operation
- High gain: 136 dB typical
- High CMRR: 133 dB typical
- High PSRR: 143 dB typical
- Very low input bias current: 40 pA maximum
- Low supply current: 1.3 mA maximum
Product Details
The AD8638/AD8639 are single and dual wide bandwidth, auto-zero amplifiers featuring rail-to-rail output swing and low noise. These amplifiers have very low offset, drift, and bias current. Operation is fully specified from 5 V to 16 V single supply (±2.5 V to ±8 V dual supply).The AD8638/AD8639 provide benefits previously found only in expensive zero-drift or chopper-stabilized amplifiers. Using the Analog Devices, Inc., topology, these auto-zero amplifiers combine low cost with high accuracy and low noise. No external capacitors are required. In addition, the AD8638/AD8639 greatly reduce the digital switching noise found in most chopper- stabilized amplifiers.
With a typical offset voltage of only 3 μV, drift of 0.01 μV/°C, and noise of 1.2 μV p-p (0.1 Hz to 10 Hz), the AD8638/AD8639 are suited for applications in which error sources cannot be tolerated. Position and pressure sensors, medical equipment, and strain gage amplifiers benefit greatly from nearly zero drift over their operating temperature ranges. Many systems can take advantage of the rail-to-rail output swing provided by the AD8638/AD8639 to maximize signal-to-noise ratio (SNR).
The AD8638/AD8639 are specified for the extended industrial temperature range (−40°C to +125°C). The single AD8638 is available in tiny 5-lead SOT-23 and 8-lead SOIC packages. The dual AD8639 is available in 8-lead MSOP, 8-lead SOIC, and 8-lead LFCSP packages.
The AD8638/AD8639 are members of a growing series of auto- zero op amps offered by Analog Devices (see Table 1 in the data sheet).
Applications
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
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MT-055: Chopper Stabilized (Auto-Zero) Precision Op Amps2/14/2015PDF320 kB
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MT-052: Op Amp Noise Figure: Don't Be Misled2/14/2015PDF60 kB
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MT-050: Op Amp Total Output Noise Calculations for Second-Order System2/14/2015PDF38 kB
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MT-049: Op Amp Total Output Noise Calculations for Single-Pole System2/14/2015PDF40 kB
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MT-048: Op Amp Noise Relationships: 1/f Noise, RMS Noise, and Equivalent Noise Bandwidth2/14/2015PDF81 kB
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MT-047: Op Amp Noise2/14/2015PDF72 kB
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CN-0183: Precision 16-Bit, Bipolar Output Voltage Source with +12 V to ±5 V Supply6/27/2012PDF252 kB
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A Deeper Look into Difference Amplifiers2/1/2014 Analog Dialogue
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MS-2066: Low Noise Signal Conditioning for Sensor-Based Circuits11/1/2010PDF425 kB
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Ask The Applications Engineer—39: Zero-Drift Operational Amplifiers3/1/2010 Analog Dialogue
Tools & Simulations
SPICE Models
CIR
AD8638 SPICE Macro Model
2.93 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.
Reference Designs (1)
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 |
|---|---|---|---|---|
| AD8638ARJZ-REEL7 | Material Declaration | Reliability Data | 5-Lead SOT-23 | |
| AD8638ARZ | Material Declaration | Reliability Data | 8-Lead SOIC | |
| AD8638ARZ-REEL | Material Declaration | Reliability Data | 8-Lead SOIC | |
| AD8638ARZ-REEL7 | Material Declaration | Reliability Data | 8-Lead SOIC | |
| Wafer Fabrication Data |
PCN-PDN Information
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Support & Discussions
AD8638 Discussions
Sample & Buy
Ordering FAQs
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Buy Now Pricing
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List Pricing
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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.