Overview
The AD797BR, produced by Analog Devices Inc., is a very low noise, low distortion operational amplifier designed for applications requiring high precision and dynamic range. It is particularly suited for use as a preamplifier in various high-performance systems. The AD797BR boasts an exceptionally low noise level of 0.9 nV/√Hz and a total harmonic distortion of −120 dB in audio bandwidths, making it ideal for applications such as professional audio preamplifiers, ultrasound, IR and sonar imaging, and seismic detection.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Offset Voltage | ±5 V, ±15 V | 25 | 80 | 125 | μV |
| Input Bias Current | ±5 V, ±15 V | 0.25 | 1.5 | 3.0 | μA |
| Input Offset Current | ±5 V, ±15 V | 100 | 400 | 700 | nA |
| Open-Loop Gain | VOUT = ±10 V, RLOAD = 2 kΩ | 1 | 20 | 20 | V/μV |
| Total Harmonic Distortion | RLOAD = 1 kΩ, f = 20 kHz, 3 V rms | −120 | −110 | −110 | dB |
| Slew Rate | 20 | V/μs | |||
| Gain Bandwidth | G = 1000 | 110 | MHz | ||
| Output Current | ±5 V, ±15 V | 30 | 50 | 50 | mA |
| Supply Voltage | ±5 | ±15 | V |
Key Features
- Very low noise: 0.9 nV/√Hz
- Low total harmonic distortion: −120 dB in audio bandwidths
- High slew rate: 20 V/μs
- High gain bandwidth: 110 MHz (G = 1000)
- Excellent dc precision: 80 μV maximum input offset voltage, 1.0 μV/°C VOS drift
- High output drive current: up to 50 mA
- Wide power supply voltage range: ±5 V to ±15 V
- Fast settling time: 800 ns to 16 bits (10 V step)
- Distortion cancellation via a single external capacitor
Applications
- Professional audio preamplifiers
- Ultrasound preamplifiers
- IR, CCD, and sonar imaging systems
- Spectrum analyzers
- Seismic detectors
- Σ-Δ ADC/DAC buffers
Q & A
- What is the typical noise level of the AD797BR?
The AD797BR has a very low noise level of 0.9 nV/√Hz.
- What is the total harmonic distortion of the AD797BR in audio bandwidths?
The total harmonic distortion is −120 dB in audio bandwidths.
- What is the slew rate of the AD797BR?
The slew rate is 20 V/μs.
- What is the gain bandwidth of the AD797BR?
The gain bandwidth is 110 MHz (G = 1000).
- What is the maximum input offset voltage of the AD797BR?
The maximum input offset voltage is 80 μV.
- What is the output drive current capability of the AD797BR?
The output drive current can be up to 50 mA.
- What is the power supply voltage range for the AD797BR?
The power supply voltage range is ±5 V to ±15 V.
- How fast does the AD797BR settle to 16 bits?
The AD797BR settles to 16 bits in less than 800 ns for a 10 V step.
- What applications is the AD797BR particularly suited for?
The AD797BR is suited for professional audio preamplifiers, ultrasound, IR and sonar imaging, spectrum analyzers, seismic detectors, and Σ-Δ ADC/DAC buffers.
- How does the AD797BR reduce distortion?
The AD797BR reduces distortion through the addition of a single external capacitor that cancels distortion due to the output stage.
