Overview
The AD797AR, produced by Analog Devices Inc., is a high-performance, low-noise operational amplifier (op-amp) designed for precision signal processing tasks. It is renowned for its exceptional audio signal quality, low total harmonic distortion, and high dynamic range, making it ideal for applications requiring high fidelity and precision. The AD797AR is particularly suited for use as a preamplifier due to its low noise of 0.9 nV/√Hz and low total harmonic distortion of −120 dB at audio bandwidths.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage | ±5 V to ±18 V | ±4.5 V | ±18 V | V | |
| Input Offset Voltage (Vos) | ±5 V, ±15 V | 25 | 80 | 125/180 | μV |
| Input Bias Current (Ib) | ±5 V, ±15 V | 0.25 | 1.5 | 3.0 | μA |
| Input Noise Voltage (en) | 1 kHz | 0.9 nV/√Hz | 1.2 nV/√Hz | nV/√Hz | |
| Gain Bandwidth Product (GBW) | AV = 1, RL = 2 kΩ | 110 MHz | MHz | ||
| Slew Rate (SR) | AV = 1, VOUT = ±10 V | 20 V/μs | V/μs | ||
| Output Current Drive | 50 mA | mA | |||
| Settling Time to 16 Bits | 10 V Step | 800 ns | ns |
Key Features
- Very low noise: 0.9 nV/√Hz at 1 kHz.
- Low total harmonic distortion: −120 dB at audio bandwidths.
- High slew rate: 20 V/μs.
- High gain bandwidth product: 110 MHz (G = 1000).
- Fast settling time: 800 ns to 16 bits (10 V step).
- High output current drive: 50 mA.
- Wide supply voltage range: ±5 V to ±18 V.
- Excellent DC precision: 80 μV max input offset voltage and 1.0 μV/°C VOS drift.
Applications
- Professional audio preamplifiers: Ideal for high-fidelity audio amplification due to its low noise and distortion.
- IR, CCD, and sonar imaging systems: Utilizes its wide dynamic range and low distortion for accurate imaging.
- Spectrum analyzers: Benefits from its performance in capturing and processing signals with minimal distortion.
- Ultrasound preamplifiers: Suitable for low-frequency ultrasound applications due to its high slew rate and gain bandwidth.
- Seismic detectors: Critical for maintaining signal integrity during conversion in precision applications.
- Σ-Δ ADC/DAC buffers: Ideal for buffering inputs to Σ-Δ ADCs or outputs of high-resolution DACs.
Q & A
- What is the typical input voltage noise of the AD797AR?
The typical input voltage noise of the AD797AR is 0.9 nV/√Hz at 1 kHz.
- What is the total harmonic distortion of the AD797AR at audio bandwidths?
The total harmonic distortion of the AD797AR is −120 dB at audio bandwidths.
- What is the slew rate of the AD797AR?
The slew rate of the AD797AR is 20 V/μs.
- What is the gain bandwidth product of the AD797AR?
The gain bandwidth product of the AD797AR is 110 MHz (G = 1000).
- How long does it take for the AD797AR to settle to 16 bits?
The AD797AR settles to 16 bits in 800 ns for a 10 V step.
- What is the maximum output current drive of the AD797AR?
The maximum output current drive of the AD797AR is 50 mA.
- What is the supply voltage range for the AD797AR?
The supply voltage range for the AD797AR is ±5 V to ±18 V.
- What are some common applications of the AD797AR?
The AD797AR is commonly used in professional audio preamplifiers, IR and sonar imaging systems, spectrum analyzers, ultrasound preamplifiers, seismic detectors, and as buffers for Σ-Δ ADCs and high-resolution DACs.
- Why is the AD797AR suitable for precision audio applications?
The AD797AR is suitable for precision audio applications due to its low noise, low distortion, and high dynamic range, ensuring high-fidelity audio amplification.
- How does the AD797AR achieve its high performance?
The AD797AR achieves its high performance through a single ultrahigh gain stage, eliminating second-stage noise effects and utilizing pairwise device matching to ensure high open-loop gain and low distortion.
