Overview
The AD8638ARJZ-REEL7, produced by Analog Devices Inc., is a 16 V auto-zero, rail-to-rail output operational amplifier. This device combines low cost with high accuracy and low noise, making it an ideal choice for applications requiring minimal error sources. The AD8638 uses Analog Devices' auto-zero topology, which eliminates the need for external capacitors and significantly reduces digital switching noise commonly found in chopper-stabilized amplifiers.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Supply Voltage | ±2.5 V to ±8 V | Dual supply |
| Offset Voltage | 3 μV (typical) | Ta = 25°C |
| Offset Voltage Drift | 0.01 μV/°C (typical) for non-SOT-23 packages | −40°C ≤ Ta ≤ +125°C |
| Input Resistance | 22.5 TΩ | Ta = 25°C |
| Input Capacitance (Differential Mode) | 4 pF | Ta = 25°C |
| Input Capacitance (Common Mode) | 1.7 pF | Ta = 25°C |
| Output Voltage High | 4.97 V (typical) at RL = 10 kΩ to VCM | −40°C ≤ Ta ≤ +125°C |
| Settling Time to 0.1% | 2.5 μs (typical) at VIN = 2 V step, CL = 20 pF, RL = 1 kΩ, AV = 1 | Ta = 25°C |
| Gain Bandwidth Product | 1.35 MHz (typical) at RL = 2 kΩ, CL = 20 pF, AV = 1 | Ta = 25°C |
| Phase Margin | 70 Degrees (typical) at RL = 2 kΩ, CL = 20 pF, AV = 1 | Ta = 25°C |
| Voltage Noise (0.1 Hz to 10 Hz) | 1.2 μV p-p (typical) | Ta = 25°C |
| Voltage Noise Density at 1 kHz | 60 nV/√Hz (typical) | Ta = 25°C |
| Operating Temperature Range | −40°C to +125°C |
Key Features
- Auto-Zero Technology: Eliminates the need for external capacitors and reduces digital switching noise.
- High Accuracy: Low offset voltage of 3 μV and low drift of 0.01 μV/°C.
- Low Noise: Voltage noise of 1.2 μV p-p (0.1 Hz to 10 Hz) and noise density of 60 nV/√Hz at 1 kHz.
- Rail-to-Rail Output: Output voltage range from 0.5 V to 15.5 V.
- High Input Resistance: 22.5 TΩ input resistance.
- Compact Packaging: Available in 5-lead SOT-23 and 8-lead SOIC, MSOP, and LFCSP packages.
Applications
- Position and Pressure Sensors: Ideal for applications requiring high accuracy and low noise.
- Medical Equipment: Suitable for medical devices where precision and stability are critical.
- Strain Gage Amplifiers: Benefits from nearly zero drift over the operating temperature range.
- Industrial Automation: Used in various industrial automation applications requiring high precision and reliability.
Q & A
- What is the typical offset voltage of the AD8638ARJZ-REEL7?
The typical offset voltage is 3 μV. - What is the operating temperature range of the AD8638ARJZ-REEL7?
The operating temperature range is −40°C to +125°C. - Does the AD8638ARJZ-REEL7 require external capacitors?
No, it does not require external capacitors due to its auto-zero technology. - What is the input resistance of the AD8638ARJZ-REEL7?
The input resistance is 22.5 TΩ. - What are the available package types for the AD8638ARJZ-REEL7?
It is available in 5-lead SOT-23 and 8-lead SOIC, MSOP, and LFCSP packages. - What is the gain bandwidth product of the AD8638ARJZ-REEL7?
The gain bandwidth product is 1.35 MHz at RL = 2 kΩ, CL = 20 pF, AV = 1. - What is the phase margin of the AD8638ARJZ-REEL7?
The phase margin is 70 degrees at RL = 2 kΩ, CL = 20 pF, AV = 1. - What is the voltage noise density at 1 kHz for the AD8638ARJZ-REEL7?
The voltage noise density at 1 kHz is 60 nV/√Hz. - What are some common applications of the AD8638ARJZ-REEL7?
Common applications include position and pressure sensors, medical equipment, strain gage amplifiers, and industrial automation. - How does the AD8638ARJZ-REEL7 reduce digital switching noise?
The AD8638ARJZ-REEL7 reduces digital switching noise through its auto-zero technology.
