Overview
The ADA4622-2BRZ-RL, produced by Analog Devices Inc., is a next-generation, single-supply, rail-to-rail output (RRO) precision operational amplifier. It is an upgrade to the AD822, offering improved performance and features while maintaining the flexibility and ease of use of its predecessor. This op-amp is designed with JFET inputs, providing low bias current and high input impedance. It operates over an extended industrial temperature range of −40°C to +125°C and can be powered from a single supply of 5 V to 30 V. The ADA4622-2 is particularly suited for applications requiring high precision, low noise, and robust signal handling in the presence of switching noise sources.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Current per Amplifier | ISY | 600 | 650 | 675 | µA |
| Slew Rate | SR | 23 | - | - | V/µs |
| Gain Bandwidth Product | GBP | - | - | 8 | MHz |
| Unity-Gain Crossover | UGC | - | - | 7 | MHz |
| -3 dB Bandwidth | - | - | - | 15.5 | MHz |
| Phase Margin | ФM | - | - | 53 | Degrees |
| Input Bias Current | IB | ±10 | - | ±1.5 nA | pA |
| Input Offset Current | IOS | ±10 | - | ±0.5 nA | pA |
| Common-Mode Rejection Ratio | CMRR | 70 | - | 87 | dB |
| Output Voltage High | VOH | 50 | - | 100 | mV |
| Output Voltage Low | VOL | 45 | - | 120 | mV |
Key Features
- Low Bias Current: The ADA4622-2 features low input bias current, making it suitable for high-impedance sources.
- High Precision: Improved DC precision with half the offset and a maximum thermal drift specification compared to the AD822.
- Enhanced Noise Performance: Reduced broadband noise by 25% and 1/f noise by half, while maintaining the same supply current as the AD822.
- Robust Signal Handling: Input EMI filters increase signal robustness against closely located switching noise sources.
- High Speed and Drive Capability: Increased bandwidth and slew rate, along with strong output drive, enabling the device to drive the inputs of modern SAR ADCs.
- Wide Operating Range: Operates from a single supply of 5 V to 30 V and over an extended industrial temperature range of −40°C to +125°C.
- Improved Common-Mode Rejection Ratio (CMRR): Enhanced CMRR makes the device more suitable for noninverting gain and difference amplifier configurations.
Applications
- Analog-to-Digital Converters (ADCs): The ADA4622-2 is capable of driving the inputs of modern single-ended SAR ADCs due to its high speed and strong output drive.
- Industrial Control Systems: Suitable for applications requiring high precision and robust signal handling in industrial environments.
- Medical Devices: The low noise and high precision make it ideal for medical equipment where signal integrity is critical.
- Aerospace and Defense: Operates over an extended temperature range, making it suitable for harsh environments.
- Automotive Systems: Can be used in automotive applications due to its robust performance and wide operating temperature range.
Q & A
- What is the operating temperature range of the ADA4622-2?
The ADA4622-2 operates over an extended industrial temperature range of −40°C to +125°C.
- What are the key improvements over the AD822?
The ADA4622-2 offers improved DC precision, reduced noise, enhanced common-mode rejection ratio, and increased speed and output drive capability.
- What is the typical supply current per amplifier?
The typical supply current per amplifier is 650 µA.
- What is the slew rate of the ADA4622-2?
The slew rate is 23 V/µs for low to high transition and -18 V/µs for high to low transition.
- What are the available packages for the ADA4622-2?
The ADA4622-2 is available in 8-lead SOIC and 8-lead MSOP packages.
- How does the ADA4622-2 handle EMI?
The ADA4622-2 includes input EMI filters to increase signal robustness against closely located switching noise sources.
- What is the common-mode rejection ratio (CMRR) of the ADA4622-2?
The CMRR is 70 dB to 87 dB, depending on the grade and operating conditions.
- Can the ADA4622-2 drive SAR ADCs?
Yes, the ADA4622-2 is capable of driving the inputs of modern single-ended SAR ADCs due to its high speed and strong output drive.
- What is the output voltage range of the ADA4622-2?
The output voltage swings rail-to-rail, meaning it can reach the supply rails.
- What are some typical applications for the ADA4622-2?
Typical applications include analog-to-digital converters, industrial control systems, medical devices, aerospace and defense, and automotive systems.
