AD8638 16 V Auto-Zero, Rail-to-Rail Output Operational Amplifier
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).
Pressure and position sensors
Strain gage amplifiers Medical instrumentation
Thermocouple amplifiers Automotive sensors
Precision references
Precision current sensing
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).
Features and BenefitsLow offset voltage: 9 μV maximumOffset drift: 0.04 μV/°C maximumRail-to-rail output swing5 V to 16 V single-supply or ±2.5 V to ±8 V dual-supply operationHigh gain: 136 dB typicalHigh CMRR: 133 dB typicalHigh PSRR: 143 dB typicalVery low input bias current: 40 pA maximumLow supply current: 1.3 mA maximum | SPICE ModelsReference Designs |
Data Sheets
Application Notes
Technical Books
Order Information
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|
| AD8638ARJZ-R2 Production | 5 ld SOT-23 | REEL 250 | -40 to 125C | 1.76 | 1.76 | Y |
| AD8638ARJZ-REEL Last Time Buy | 5 ld SOT-23 | REEL 10000 | -40 to 125C | 0 | 0 | Y |
| AD8638ARJZ-REEL7 Production | 5 ld SOT-23 | REEL 3000 | -40 to 125C | 0 | 1.08 | Y |
| AD8638ARZ Production | 8 ld SOIC | OTH 98 | -40 to 125C | 1.28 | 1.08 | Y |
| AD8638ARZ-REEL Production | 8 ld SOIC | REEL 2500 | -40 to 125C | 0 | 1.08 | Y |
| AD8638ARZ-REEL7 Production | 8 ld SOIC | REEL 1000 | -40 to 125C | 0 | 1.08 | Y |
Evaluation Boards
| Part Number | Description | Price | RoHS |
|---|
| EVAL-PRAOPAMP-1KSZ | Single KS-5 lead SC70 Evaluation Board | 20.19 | Y |
| EVAL-PRAOPAMP-1RJZ | Single RJ-5 lead SOT23 Evaluation Board | 20.19 | Y |
| EVAL-PRAOPAMP-1RMZ | Single RM-8 lead MSOP Evaluation Board | 20.19 | Y |
| EVAL-PRAOPAMP-1RZ | Single R-8 lead SOIC Evaluation Board | 20.19 | Y |
Reference Materials
