Overview
The AD844SQ, produced by Analog Devices Inc., is a high-speed monolithic operational amplifier that utilizes a current feedback architecture. This amplifier is distinguished by its excellent combination of AC and DC performance, making it versatile and highly effective in various applications. The AD844SQ is fabricated using Analog Devices' junction isolated complementary bipolar (CB) process, which ensures high bandwidth and fast large signal response along with excellent DC performance.
Optimized for use in current-to-voltage applications and as an inverting mode amplifier, the AD844SQ is also suitable for noninverting applications. It offers superior AC performance, high linearity, and a clean pulse response, making it an excellent choice for demanding analog signal processing tasks.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Bandwidth | Up to 60 MHz | TA = 25°C, VS = ±15 V |
| Slew Rate | 2000 V/μs | Full 20 V output step |
| Settling Time | 100 ns to 0.1% | Essentially independent of gain |
| Offset Voltage | 50 μV (laser trimmed) | TA = 25°C |
| Offset Voltage Drift | 1 μV/°C | |
| Input Bias Current Drift | 9 nA/°C | |
| Power Supply Range | ±4.5 V to ±18 V | |
| Load Drive Capability | 50 Ω loads to ±2.5 V | |
| Short-Circuit Protection | 80 mA | |
| Package Options | 8-lead CERDIP (Q) | |
| Temperature Range | -55°C to +125°C (military grade) |
Key Features
- High Bandwidth and Fast Response: The AD844SQ offers a bandwidth of up to 60 MHz and a slew rate of 2000 V/μs, making it suitable for high-speed applications.
- Low Distortion and Noise: It combines low distortion, low noise, and low drift, ensuring high-quality signal processing.
- Current Feedback Architecture: This architecture provides better AC performance, high linearity, and an exceptionally clean pulse response compared to traditional op-amps.
- Wide Power Supply Range: The AD844SQ can be operated from ±4.5 V to ±18 V power supplies, offering flexibility in system design.
- High Load Drive Capability: It can drive 50 Ω loads to ±2.5 V and handle large capacitive loads with an external network.
- Short-Circuit Protection: The amplifier is short-circuit protected to 80 mA.
- Precision DC Performance: The offset voltage and input bias currents are laser trimmed to minimize DC errors.
Applications
- Video Applications: The AD844SQ is suitable for video applications with bandwidths up to 60 MHz due to its excellent differential gain and differential phase characteristics.
- Flash Analog-to-Digital Converters (ADCs): It is outstanding as an input amplifier for flash ADCs due to its low distortion, low noise, and wide bandwidth.
- Current-to-Voltage Applications: Optimized for use in current-to-voltage applications and as an inverting mode amplifier.
- General Analog Signal Processing: Suitable for many noninverting applications and can replace traditional op-amps in various analog circuits.
Q & A
- What is the bandwidth of the AD844SQ?
The AD844SQ has a bandwidth of up to 60 MHz.
- What is the slew rate of the AD844SQ?
The slew rate of the AD844SQ is 2000 V/μs for a full 20 V output step.
- What is the settling time of the AD844SQ?
The settling time is typically 100 ns to 0.1%, and it is essentially independent of gain.
- What is the offset voltage of the AD844SQ?
The offset voltage is laser trimmed to the 50 μV level.
- What is the temperature range for the military grade AD844SQ?
The military grade AD844SQ operates over a temperature range of -55°C to +125°C.
- Can the AD844SQ drive large capacitive loads?
Yes, the AD844SQ can drive large capacitive loads using an external network.
- Is the AD844SQ short-circuit protected?
Yes, the AD844SQ is short-circuit protected to 80 mA.
- What are the package options for the AD844SQ?
The AD844SQ is available in an 8-lead CERDIP (Q) package.
- What are some common applications of the AD844SQ?
Common applications include video applications, flash ADCs, current-to-voltage applications, and general analog signal processing.
- What is the power supply range for the AD844SQ?
The AD844SQ can be operated from ±4.5 V to ±18 V power supplies.
