Pressure and position sensors Strain gage amplifiers Medical instrumentation Thermocouple amplifiers Automotive sensors Precision references Precision current sensing
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
Features and Benefits | AmplifiersSPICE ModelsReference Designs |
| Document | note |
| AD8638/AD8639: 16 V Auto-Zero, Rail-to-Rail Output Operational Amplifiers Data Sheet (Rev. F) | PDF 632 kB |
| Document | note |
| AN-1114: Lowest Noise Zero-Drift Amplifier Has 5.6 nV/√Hz Voltage Noise Density (Rev. B) | PDF 182 kB |
| Document | note |
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|---|---|---|---|---|---|
| AD8639ACPZ-R2 Production | 8 ld LFCSP (3x3mm 1.74x2.38 EP) | REEL 250 | -40 to 125C | 3.05 | 3.05 | Y |
| AD8639ACPZ-REEL Production | 8 ld LFCSP (3x3mm 1.74x2.38 EP) | REEL 5000 | -40 to 125C | 0 | 1.86 | Y |
| AD8639ACPZ-REEL7 Production | 8 ld LFCSP (3x3mm 1.74x2.38 EP) | REEL 1500 | -40 to 125C | 0 | 1.86 | Y |
| AD8639ARMZ Production | 8 ld MSOP | OTH 50 | -40 to 125C | 2.24 | 1.89 | Y |
| AD8639ARMZ-R7 Production | 8 ld MSOP | REEL 1000 | -40 to 125C | 0 | 1.89 | Y |
| AD8639ARMZ-REEL Production | 8 ld MSOP | REEL 3000 | -40 to 125C | 0 | 1.89 | Y |
| AD8639ARZ Production | 8 ld SOIC | OTH 98 | -40 to 125C | 2.24 | 1.89 | Y |
| AD8639ARZ-REEL Production | 8 ld SOIC | REEL 2500 | -40 to 125C | 0 | 1.89 | Y |
| AD8639ARZ-REEL7 Production | 8 ld SOIC | REEL 1000 | -40 to 125C | 0 | 1.89 | Y |
| AD8639WARZ Production | 8 ld SOIC | OTH 98 | -40 to 125C | 3.29 | 2.78 | Y |
| AD8639WARZ-R7 Production | 8 ld SOIC | REEL 1000 | -40 to 125C | 0 | 2.78 | Y |
| AD8639WARZ-RL Production | 8 ld SOIC | REEL 2500 | -40 to 125C | 0 | 2.78 | Y |
| Part Number | Description | Price | RoHS |
|---|---|---|---|
| EVAL-PRAOPAMP-2CPZ | Dual CP-8 lead LFCSP Evaluation Board | 20.19 | Y |
| EVAL-PRAOPAMP-2RMZ | Dual RM-8 lead MSOP Evaluation Board | 20.19 | Y |
| EVAL-PRAOPAMP-2RZ | Dual R-8 lead SOIC Evaluation Board | 20.19 | Y |
