Overview
The AD8021AR is a high-performance, high-speed voltage feedback operational amplifier produced by Analog Devices Inc. It is designed for use in 16-bit resolution systems and is notable for its low noise and high speed characteristics. The amplifier 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. The AD8021AR is fabricated using Analog Devices' proprietary High Voltage eXtra-Fast Complementary Bipolar (XFCB) process, which enhances its performance and reduces nonlinear capacitance and distortion.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Supply Voltage | ±2.25 V | - | ±12 V | V |
| Quiescent Current | 7.0 mA | 7.7 mA | 8.6 mA | mA |
| Output Current | - | 60 mA | - | mA |
| Slew Rate | 95 V/μs | 120 V/μs | 150 V/μs | V/μs |
| Input Offset Voltage (Vos) | - | 1 mV | - | mV |
| Common Mode Rejection Ratio | - | 98 dB | - | dB |
| Power Supply Rejection Ratio (PSRR) | -86 dB | -95 dB | -100 dB | dB |
| Settling Time | - | 23 ns | - | ns |
| Input Noise Voltage | - | 2.1 nV/√Hz | - | nV/√Hz |
| Input Noise Current | - | 2.1 pA/√Hz | - | pA/√Hz |
| Package/Case | - | 8-SOIC, MSOP-8 | - | - |
Key Features
- Low Noise: The AD8021AR features low voltage and current noise, with typical values of 2.1 nV/√Hz and 2.1 pA/√Hz, respectively.
- High Speed: It has a high slew rate of up to 120 V/μs and a wide bandwidth, making it suitable for high-speed applications.
- Custom Compensation: The amplifier allows for custom compensation using an external capacitor to optimize performance for different gain and load conditions.
- Wide Supply Range: It operates over a wide range of supply voltages from ±2.25 V to ±12 V, as well as from single 5 V supplies.
- Low Quiescent Current: The AD8021AR has a low quiescent supply current of 7.7 mA at ±5 V, which can be further reduced to 1.3 mA when the output is disabled.
- High Precision: It has a low input offset voltage of 1 mV and a low input offset voltage drift of 0.5 μV/°C.
- Fast Settling Time: The amplifier settles to 0.01% in 23 ns for a 1 V step.
Applications
- ADC Preamp and Driver: Ideal for driving high-resolution analog-to-digital converters (ADCs) in data acquisition systems.
- Instrumentation Preamp: Used in precision instrumentation due to its high speed and low noise characteristics.
- Active Filters: Suitable for active filter circuits requiring high bandwidth and low distortion.
- Portable Instrumentation: Its low power consumption makes it suitable for portable instrumentation applications.
- Line Receivers and Precision Instruments: Used in line receivers and other precision instruments where high speed and low noise are critical.
- Ultrasound Signal Processing: Can be used in ultrasound signal processing due to its high speed and low noise.
- High Gain Circuits: Suitable for high gain circuits where stability and low noise are essential.
Q & A
- What is the typical input noise voltage of the AD8021AR?
The typical input noise voltage of the AD8021AR is 2.1 nV/√Hz.
- What is the slew rate of the AD8021AR?
The slew rate of the AD8021AR is up to 120 V/μs.
- What is the quiescent current of the AD8021AR when the output is enabled?
The quiescent current of the AD8021AR when the output is enabled is typically 7.7 mA at ±5 V.
- Can the AD8021AR be used with single supply voltages?
Yes, the AD8021AR can operate from single 5 V supplies in addition to dual supply voltages.
- What is the settling time of the AD8021AR for a 1 V step?
The AD8021AR settles to 0.01% in 23 ns for a 1 V step.
- What are the typical applications of the AD8021AR?
The AD8021AR is typically used in ADC preamps, instrumentation preamps, active filters, portable instrumentation, line receivers, precision instruments, and ultrasound signal processing.
- What is the input offset voltage of the AD8021AR?
The input offset voltage of the AD8021AR is typically 1 mV.
- How does the AD8021AR handle custom compensation?
The AD8021AR allows for custom compensation using an external capacitor to optimize performance for different gain and load conditions.
- What is the common mode rejection ratio (CMRR) of the AD8021AR?
The CMRR of the AD8021AR is typically 98 dB.
- What are the package options for the AD8021AR?
The AD8021AR is available in both 8-lead SOIC and MSOP-8 packages.
