Overview
The AD8021ARZ-REEL7, produced by Analog Devices Inc., is an exceptionally high-performance, high-speed voltage feedback amplifier. It is designed for use in 16-bit resolution systems, making it ideal for high-speed, low-power instruments. The AD8021 operates over a wide range of supply voltages from ±2.25 V to ±12 V, as well as from single 5 V supplies. This amplifier is fabricated on Analog Devices' proprietary High Voltage eXtra-Fast Complementary Bipolar (XFCB) process, which enhances its performance by reducing parasitic and latch-up problems and increasing transistor frequency response.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Supply Voltage | ±2.25 V to ±12 V, 5 V single supply | |
| Quiescent Supply Current | 7 mA @ ±5 V, 1.3 mA with output disable | |
| Input Noise Voltage | 2.1 nV/√Hz @ 50 kHz | |
| Input Noise Current | 2.1 pA/√Hz | |
| Slew Rate | 460 V/μs | |
| Gain Bandwidth Product | 1 GHz | |
| Input Offset Voltage (Vos) | 1 mV | |
| Input Bias Current | 7.5 μA | |
| Power Supply Rejection Ratio (PSRR) | 95 dB | |
| Common Mode Rejection Ratio (CMRR) | 98 dB | |
| Settling Time (0.01% for 1 V step) | 23 ns | |
| Overload Recovery Time | 50 ns | |
| Operating Temperature Range | -40°C to +85°C | |
| Package | 8-lead SOIC and MSOP |
Key Features
- Low Noise and High Speed: The AD8021 features low voltage and current noise, making it suitable for high-resolution systems.
- Adjustable Compensation: Users can adjust the gain bandwidth product with a single capacitor, allowing for flexible gain configurations without significant trade-offs in bandwidth.
- Fast Settling and Overload Recovery: The amplifier settles to 0.01% in 23 ns for a 1 V step and has a fast overload recovery time of 50 ns.
- High Input Impedance and Low Input Bias Current: The AD8021 has a high transconductance input stage, resulting in low input noise and bias current.
- Output Disable Feature: An output disable pin allows for further reduction of quiescent supply current to 1.3 mA.
- Differential Driver Capability: The AD8021 is well-suited as a low noise differential driver for ADCs, balanced lines, and other applications requiring differential drive.
Applications
- High-Resolution ADC Drivers: The AD8021 is particularly suitable as a buffer/driver for high-resolution ADCs, especially in 16-bit systems with high sampling rates.
- Signal Processing Chains and Control Loops: Its high speed and low noise make it ideal for use throughout signal processing chains and in control loops.
- Video and Audio Systems: The amplifier can drive a 75 Ω line with ±3 V video signals, making it suitable for video and audio applications).
- General-Purpose Amplification: The AD8021 can be used in a wide variety of gain configurations, making it a versatile general-purpose amplifier.
Q & A
- What is the typical input noise voltage of the AD8021?
The typical input noise voltage of the AD8021 is 2.1 nV/√Hz at 50 kHz.
- What is the quiescent supply current of the AD8021?
The quiescent supply current is 7 mA at ±5 V, and it can be reduced to 1.3 mA with the output disable feature).
- What is the gain bandwidth product of the AD8021?
The gain bandwidth product of the AD8021 is 1 GHz.
- What is the settling time of the AD8021 for a 1 V step?
The settling time to 0.01% for a 1 V step is 23 ns).
- What is the operating temperature range of the AD8021?
The operating temperature range is -40°C to +85°C.
- What package options are available for the AD8021?
The AD8021 is available in 8-lead SOIC and MSOP packages.
- Can the AD8021 be used as a differential driver?
Yes, the AD8021 is well-suited as a low noise differential driver for many applications).
- What is the input bias current of the AD8021?
The input bias current is typically 7.5 μA).
- How does the AD8021 handle high-frequency signals?
The AD8021 has a high gain bandwidth product and low harmonic distortion, making it suitable for handling high-frequency signals with minimal distortion).
- Is the AD8021 stable over temperature?
Yes, the AD8021 is stable over temperature with low input offset voltage drift and input bias current drift).
