Overview
The AD8021ARM-REEL, produced by Analog Devices Inc., is a high-performance, high-speed voltage feedback operational amplifier. It is designed for use in 16-bit resolution systems and is known for its low noise and adjustable compensation capabilities. Fabricated on Analog Devices' proprietary High Voltage eXtra-Fast Complementary Bipolar (XFCB) process, the AD8021 offers stability over temperature with low input offset voltage drift and input bias current drift. This amplifier is ideal for a wide variety of gain configurations and can be used throughout a signal processing chain and in control loops.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| -3 dB Small Signal Bandwidth | G = +1, CC = 10 pF, VO = 0.05 V p-p | 355 | 490 | - | MHz |
| -3 dB Small Signal Bandwidth | G = +2, CC = 7 pF, VO = 0.05 V p-p | 160 | 205 | - | MHz |
| -3 dB Small Signal Bandwidth | G = +5, CC = 2 pF, VO = 0.05 V p-p | 150 | 185 | - | MHz |
| -3 dB Small Signal Bandwidth | G = +10, CC = 0 pF, VO = 0.05 V p-p | 110 | 150 | - | MHz |
| Slew Rate, 1 V Step | G = +1, CC = 10 pF | 95 | 120 | - | V/μs |
| Slew Rate, 1 V Step | G = +2, CC = 7 pF | 120 | 150 | - | V/μs |
| Slew Rate, 1 V Step | G = +5, CC = 2 pF | 250 | 300 | - | V/μs |
| Slew Rate, 1 V Step | G = +10, CC = 0 pF | 380 | 420 | - | V/μs |
| Settling Time to 0.01% | VO = 1 V Step, RL = 500 Ω | - | 23 | - | ns |
| Input Voltage Noise | - | - | 2.1 | - | nV/√Hz |
| Input Current Noise | - | - | 2.1 | - | pA/√Hz |
| Operating Supply Current | Output Enabled | 7.0 | 7.7 | - | mA |
| Operating Supply Current | Output Disabled | 1.3 | 1.6 | - | mA |
| Power Supply Rejection Ratio (PSRR) | VCC = +4 V to +6 V, VEE = –5 V | -86 | -95 | - | dB |
| Package | - | - | 8-Lead SOIC, 8-Lead MSOP | - | - |
| Operating Temperature Range | - | -40°C | - | +85°C | °C |
Key Features
- Low Noise: The AD8021 features low input voltage noise of 2.1 nV/√Hz and low input current noise of 2.1 pA/√Hz, making it suitable for high-resolution applications.
- High Speed: It offers high slew rates up to 420 V/μs and a wide bandwidth range, depending on the gain configuration.
- Custom Compensation: The amplifier allows for adjustable compensation, enabling users to optimize the trade-off between bandwidth and phase margin for specific applications.
- Stability Over Temperature: The AD8021 is stable over temperature with low input offset voltage drift and input bias current drift.
- Flexible Packaging: Available in both 8-lead SOIC and MSOP packages, suitable for industrial temperature ranges of -40°C to +85°C.
Applications
- High Resolution ADC Drivers: The AD8021 is particularly suitable as a buffer/driver for high-resolution ADCs due to its low noise and adjustable compensation, preserving the phase and gain integrity of the sampled waveform.
- Differential Drivers: It is well-suited as a low noise differential driver for many ADCs, balanced lines, and other applications requiring differential drive.
- Signal Processing and Control Loops: The amplifier can be used throughout a signal processing chain and in control loops due to its high speed and stability).
- Video and Audio Systems: Capable of driving a 75 Ω line with ±3 V video signals, making it suitable for video and audio applications).
Q & A
- What is the typical input voltage noise of the AD8021?
The typical input voltage noise of the AD8021 is 2.1 nV/√Hz.
- What are the available package types for the AD8021?
The AD8021 is available in both 8-lead SOIC and MSOP packages).
- What is the operating temperature range of the AD8021?
The operating temperature range of the AD8021 is -40°C to +85°C).
- How does the AD8021 handle compensation for different gain configurations?
The AD8021 allows for adjustable compensation, enabling users to optimize the trade-off between bandwidth and phase margin for specific applications).
- What are some common applications of the AD8021?
The AD8021 is commonly used as a driver for high-resolution ADCs, differential drivers, and in signal processing chains and control loops).
- What is the slew rate of the AD8021 at a gain of +10?
The slew rate of the AD8021 at a gain of +10 is up to 420 V/μs).
- How does the AD8021 perform in terms of power supply rejection ratio (PSRR)?
The AD8021 has a power supply rejection ratio (PSRR) of -86 dB to -95 dB, depending on the supply voltage conditions).
- Can the AD8021 drive a 75 Ω line?
Yes, the AD8021 is capable of driving a 75 Ω line with ±3 V video signals).
- What is the quiescent current of the AD8021 when the output is enabled?
The quiescent current of the AD8021 when the output is enabled is approximately 7.0 mA to 7.7 mA).
- How does the AD8021 handle settling time?
The AD8021 has a settling time to 0.01% of 23 ns for a 1 V step with a load resistance of 500 Ω).
