Overview
The AD8021ARMZ-REEL7, produced by Analog Devices Inc., is a high-performance, low-noise, high-speed operational amplifier. It is fabricated using Analog Devices' proprietary High Voltage eXtra-Fast Complementary Bipolar (XFCB) process, which enables low voltage and low current noise while maintaining high speed and low power consumption. This amplifier is designed for use in 16-bit resolution systems and is ideal for high-speed, low-power instruments. 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 applications.
Key Specifications
| Parameter | Typical Value | Conditions |
|---|---|---|
| Input Voltage Noise | 2.1 nV/√Hz | VS = ±5 V, @ TA = 25°C |
| Input Current Noise | 2.1 pA/√Hz | VS = ±5 V, @ TA = 25°C |
| Quiescent Supply Current | 7 mA | VS = ±5 V |
| Output Disable Current | 1.3 mA | Output disabled |
| Supply Voltage Range | ±2.25 V to ±12 V, or single 5 V | |
| Gain Bandwidth Product | Adjustable with compensation capacitor | |
| Settling Time (0.01% for 1 V step) | 23 ns | |
| Overload Recovery Time | 50 ns | |
| Input Offset Voltage Drift | 0.5 μV/°C | |
| Input Bias Current Drift | 10 nA/°C | |
| Operating Temperature Range | -40°C to +85°C |
Key Features
- Low noise and low current noise (2.1 nV/√Hz and 2.1 pA/√Hz respectively)
- High speed with adjustable gain bandwidth product using a compensation capacitor
- Low quiescent supply current (7 mA @ ±5 V) with an output disable feature to reduce current to 1.3 mA
- Wide supply voltage range (±2.25 V to ±12 V, or single 5 V)
- Fast settling time (23 ns for 0.01% of a 1 V step) and fast overload recovery (50 ns)
- Stable over temperature with low input offset voltage drift and input bias current drift
- Capable of driving a 75 Ω line with ±3 V video signals
- Available in 8-lead SOIC and MSOP packages
Applications
- High-speed, low-power instruments
- Buffer/driver for high-resolution ADCs (especially 16-bit systems)
- Differential driver for ADCs, balanced lines, and other differential drive applications
- Signal processing chains and control loops
- Video and audio signal processing where low noise and high speed are critical
Q & A
- What is the typical input voltage noise of the AD8021?
The typical input voltage noise is 2.1 nV/√Hz at VS = ±5 V and TA = 25°C.
- How much quiescent supply current does the AD8021 consume?
The AD8021 consumes 7 mA of quiescent supply current at VS = ±5 V. This can be reduced to 1.3 mA when the output is disabled.
- What is the operating temperature range of the AD8021?
The AD8021 operates over a temperature range of -40°C to +85°C.
- 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 are the available packages for the AD8021?
The AD8021 is available in both standard 8-lead SOIC and MSOP packages.
- How does the AD8021 adjust its gain bandwidth product?
The gain bandwidth product of the AD8021 can be adjusted using a compensation capacitor.
- 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 overload recovery time of the AD8021?
The overload recovery time is 50 ns.
- Is the AD8021 suitable for high-resolution ADCs?
Yes, the AD8021 is especially suitable as a buffer/driver for high-resolution ADCs, particularly 16-bit systems.
- Can the AD8021 be used as a differential driver?
Yes, the AD8021 is uniquely suited as a low noise differential driver for many ADCs, balanced lines, and other applications requiring differential drive.
