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AD8630 Zero Drift, Single-Supply, Rail-to-Rail Quad Op Amp

Automotive sensors Pressure and position sensors Strain gage amplifiers Medical instrumentation Thermocouple amplifiers Precision current sensing Photodiode amplifiers

This amplifier has ultralow offset, drift, and bias current. The AD8628/AD8629/AD8630 are wide bandwidth auto-zero amplifiers featuring rail-to-rail input and output swing and low noise. Operation is fully specified from 2.7 V to 5 V single supply (±1.35 V to ±2.5 V dual supply).

The AD8628/AD8629/AD8630 provide benefits previously found only in expensive auto-zeroing or chopper-stabilized amplifiers. Using Analog Devices, Inc., topology, these zero-drift amplifiers combine low cost with high accuracy and low noise. No external capacitor is required. In addition, the AD8628/ AD8629/AD8630 greatly reduce the digital switching noise found in most chopper-stabilized amplifiers.

With an offset voltage of only 1 μV, drift of less than 0.005 μV/°C, and noise of only 0.5 μV p-p (0 Hz to 10 Hz), the AD8628/ AD8629/AD8630 are suited for applications where 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 range. Many systems can take advantage of the rail-to-rail input and output swings provided by the AD8628/AD8629/AD8630 to reduce input biasing complexity and maximize SNR.

The AD8628/AD8629/AD8630 are specified for the extended industrial temperature range (−40°C to +125°C). The AD8628 is available in tiny 5-lead TSOT, 5-lead SOT-23, and 8-lead narrow SOIC plastic packages. The AD8629 is available in the standard 8-lead narrow SOIC and MSOP plastic packages. The AD8630 quad amplifier is available in 14-lead narrow SOIC and 14-lead TSSOP plastic packages. See the Ordering Guide for automotive grades.

Applications

Data Sheet, Rev. H, 4/2010

Data Sheets

Application Notes

Technical Books

Order Information

Evaluation Boards

Reference Materials

• Tutorials：MT-055: Chopper Stabilized (Auto-Zero) Precision Op Amps
• Tutorials：MT-052: Op Amp Noise Figure: Don't Be Misled
• Tutorials：MT-050: Op Amp Total Output Noise Calculations for Second-Order System
• Tutorials：MT-049: Op Amp Total Output Noise Calculations for Single-Pole System
• Tutorials：MT-048: Op Amp Noise Relationships: 1/f Noise, RMS Noise, and Equivalent...
• Tutorials：MT-047: Op Amp Noise
• Analog Dialogue：Demystifying Auto-Zero Amplifiers Part 2
• Analog Dialogue：Demystifying Auto-Zero Amplifiers Part 1
• Technical Articles：MS-2066: Low Noise Signal Conditioning for Sensor-Based Circuits