Overview
The AD844AN is a high-speed monolithic operational amplifier produced by Analog Devices Inc. It is fabricated using the junction isolated complementary bipolar (CB) process, which combines high bandwidth and very fast large signal response with excellent DC performance. This operational amplifier is optimized for use in current-to-voltage applications and as an inverting mode amplifier, but it is also suitable for many noninverting applications. The AD844AN stands out due to its current feedback architecture, which provides better AC performance, high linearity, and an exceptionally clean pulse response compared to traditional op amps.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Bandwidth | 60 MHz (Gain = -1), 33 MHz (Gain = -10) | TA = 25°C, VS = ±15 V |
| Output Slew Rate | Up to 2000 V/μs | Full 20 V output step |
| Settling Time | 100 ns to 0.1% | 10 V step |
| Offset Voltage | 150 μV Max (B Grade) | Laser trimmed |
| Input Bias Current | Typically 9 nA/°C drift | Laser trimmed |
| Supply Voltage Range | ±4.5 V to ±18 V | |
| Output Current | 650 mA into 50 Ω load | |
| Quiescent Current | 6.5 mA | |
| Temperature Range | -40°C to +85°C (Industrial), 0°C to 70°C (Commercial) | |
| Package Options | 8-lead PDIP, 8-lead CERDIP, 16-lead SOIC |
Key Features
- High bandwidth and fast large signal response with excellent DC performance.
- Current feedback architecture providing better AC performance, high linearity, and clean pulse response.
- Essentially free from slew rate limitations with rise and fall times independent of output level.
- Capable of driving loads down to 50 Ω and large capacitive loads using an external network.
- Laser-trimmed offset voltage and input bias currents to minimize DC errors.
- Excellent differential gain and differential phase characteristics, suitable for video applications up to 60 MHz.
- Low distortion, low noise, and low drift, making it suitable for flash analog-to-digital converters (ADCs).
- Short-circuit protected to 80 mA.
Applications
- Current-to-voltage applications.
- Inverting mode amplifier applications.
- Noninverting applications.
- Video applications with bandwidths up to 60 MHz.
- Input amplifiers for flash analog-to-digital converters (ADCs).
- Driving low impedance loads such as terminated cables.
Q & A
- What is the bandwidth of the AD844AN at a gain of -1?
The bandwidth of the AD844AN at a gain of -1 is 60 MHz.
- What is the output slew rate of the AD844AN?
The output slew rate of the AD844AN is up to 2000 V/μs for a full 20 V output step.
- How long does the AD844AN take to settle to 0.1%?
The AD844AN settles to 0.1% in typically 100 ns for a 10 V step.
- What is the maximum offset voltage of the AD844AN?
The maximum offset voltage of the AD844AN is 150 μV (B Grade).
- What is the input bias current drift of the AD844AN?
The input bias current drift of the AD844AN is typically 9 nA/°C.
- What is the supply voltage range for the AD844AN?
The supply voltage range for the AD844AN is ±4.5 V to ±18 V.
- What is the maximum output current of the AD844AN?
The AD844AN can deliver up to 650 mA into a 50 Ω load.
- What are the package options available for the AD844AN?
The AD844AN is available in 8-lead PDIP, 8-lead CERDIP, and 16-lead SOIC packages.
- Is the AD844AN protected against short circuits?
Yes, the AD844AN is short-circuit protected to 80 mA.
- What are some typical applications of the AD844AN?
The AD844AN is typically used in current-to-voltage applications, inverting mode amplifier applications, noninverting applications, video applications, and as input amplifiers for flash ADCs.
