Overview
The AD8021AR-REEL7, 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 fabricated on Analog Devices' proprietary High Voltage eXtra-Fast Complementary Bipolar (XFCB) process. This amplifier is notable for its low noise characteristics, with input voltage noise of 2.1 nV/√Hz and input current noise of 2.1 pA/√Hz. It operates over a wide range of supply voltages from ±2.25 V to ±12 V, as well as from single 5 V supplies, making it versatile for various high-speed, low-power applications.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage Range | ±2.25 | ±12.0 | V | ||
| Quiescent Current (Output Enabled) | VS = ±5 V | 7.0 | 7.7 | mA | |
| Quiescent Current (Output Disabled) | VS = ±5 V | 1.3 | 1.6 | mA | |
| Input Offset Voltage | 0.4 | 1.0 | mV | ||
| Input Bias Current | 8 | 11.3 | μA | ||
| Common-Mode Rejection Ratio | VCM = ±10 V | -86 | -96 | dB | |
| Output Voltage Swing | RL = 1 kΩ | -10.2 | +9.8 | V | |
| Slew Rate (1 V Step) | G = +1, CC = 10 pF | 95 | 120 | V/μs | |
| Settling Time to 0.01% | VO = 1 V Step, RL = 500 Ω | 23 | ns |
Key Features
- Low Noise: Input voltage noise of 2.1 nV/√Hz and input current noise of 2.1 pA/√Hz, making it suitable for high-resolution applications.
- Custom Compensation: Allows the user to adjust the gain bandwidth product with minimal trade-off in bandwidth using an external capacitor.
- High Speed: Fast slew rates up to 420 V/μs and settling times as low as 23 ns to 0.01% for a 1 V step.
- Wide Supply Voltage Range: Operates from ±2.25 V to ±12 V and single 5 V supplies, enhancing its versatility.
- Output Disable Feature: Reduces quiescent supply current to 1.3 mA when the output is disabled.
- High Common-Mode Rejection Ratio (CMRR): Up to -96 dB, ensuring good performance in differential applications.
Applications
- High-Resolution ADC Drivers: Ideal for driving high-resolution ADCs due to its low noise and adjustable compensation features.
- Differential Drivers: Suitable for balanced lines and other differential drive applications, ensuring matched bandwidths and minimal distortion.
- Active Filters: The low noise and high gain bandwidth make it an excellent choice for active filter circuits.
- Video and Audio Systems: Capable of driving 75 Ω lines with ±3 V video signals, making it suitable for video and audio applications.
- Control Loops and Signal Processing Chains: General-purpose amplifier suitable for various gain configurations and control loops.
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 is the quiescent current when the output is enabled and disabled?
The quiescent current is 7.0 mA when the output is enabled and 1.3 mA when the output is disabled.
- What is the slew rate of the AD8021 for a 1 V step?
The slew rate can be up to 420 V/μs depending on the gain and compensation settings.
- What is the settling time to 0.01% for a 1 V step?
The settling time is as low as 23 ns for a 1 V step.
- What is the common-mode rejection ratio (CMRR) of the AD8021?
The CMRR is up to -96 dB.
- Can the AD8021 operate on a single supply voltage?
Yes, the AD8021 can operate on a single 5 V supply in addition to dual supply voltages.
- What is the output voltage swing of the AD8021?
The output voltage swing is typically from -10.2 V to +9.8 V with a load resistance of 1 kΩ.
- Is the AD8021 suitable for high-resolution ADC applications?
Yes, it is particularly suitable due to its low noise and adjustable compensation features.
- Can the AD8021 be used in active filter circuits?
Yes, its low noise and high gain bandwidth make it an excellent choice for active filter circuits.
- What are the typical operating temperatures for the AD8021?
The AD8021 operates over a temperature range of -40°C to +85°C.
