Overview
The AD797BRZ, produced by Analog Devices Inc., is a high-performance operational amplifier known for its ultra-low noise and distortion characteristics. It is particularly suited for applications requiring high dynamic range and precision, such as preamplifiers in professional audio equipment, infrared (IR) and sonar imaging systems, and ultrasound preamplifiers. The AD797 features a single ultrahigh gain stage that ensures both DC and dynamic precision, making it ideal for critical applications where low noise and high accuracy are essential.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage | ±5 V to ±18 V | - | - | - | V |
| Input Offset Voltage | ±5 V, ±15 V | 25 | 80 | 125/180 | μV |
| Offset Voltage Drift | ±5 V, ±15 V | 0.2 | 1.0 | 0.6 | μV/°C |
| Input Bias Current | ±5 V, ±15 V | 0.25 | 1.5 | 3.0 | μA |
| Input Offset Current | ±5 V, ±15 V | 100 | 400 | 600/700 | nA |
| Open-Loop Gain | VOUT = ±10 V, RLOAD = 2 kΩ | 1 | 20 | 15 | V/mV |
| Slew Rate | - | - | 20 | - | V/μs |
| Gain Bandwidth | - | - | 110 MHz | - | - |
| Output Current Drive | - | - | 50 mA | - | - |
| Quiescent Supply Current | ±5 V, ±15 V | 8.2 | 10.5 | - | mA |
Key Features
- Ultra-low noise of 0.9 nV/√Hz, making it suitable for high-sensitivity applications.
- Low total harmonic distortion (THD) of −120 dB in audio bandwidths, ensuring high fidelity in audio applications.
- High slew rate of 20 V/μs and a gain bandwidth of 110 MHz, enabling use in high-frequency applications.
- Excellent settling time, achieving 16-bit accuracy in less than 800 ns.
- Wide supply voltage range of ±5 V to ±18 V, providing flexibility in system design.
- High output current drive of up to 50 mA, suitable for driving heavy loads.
- Low input bias current and offset current, ensuring minimal input signal distortion.
Applications
- Preamplifiers in professional audio equipment and mixing consoles.
- Infrared (IR) and sonar imaging systems.
- Ultrasound preamplifiers and medical imaging devices.
- Seismic detectors and spectrum analyzers.
- Buffering inputs to Σ-Δ ADCs or outputs of high-resolution DACs.
- Critical applications requiring low noise and high accuracy, such as in scientific instruments and high-end audio equipment.
Q & A
- What is the primary application of the AD797 operational amplifier?
The AD797 is primarily used as a preamplifier in applications requiring ultra-low noise and distortion, such as professional audio equipment, IR and sonar imaging, and ultrasound preamplifiers.
- What is the noise level of the AD797?
The AD797 has a very low noise level of 0.9 nV/√Hz.
- What is the total harmonic distortion (THD) of the AD797?
The AD797 has a THD of −120 dB in audio bandwidths.
- What is the slew rate of the AD797?
The slew rate of the AD797 is 20 V/μs.
- What is the gain bandwidth of the AD797?
The gain bandwidth of the AD797 is 110 MHz.
- What is the output current drive capability of the AD797?
The AD797 can drive up to 50 mA of output current.
- What is the supply voltage range for the AD797?
The AD797 operates within a supply voltage range of ±5 V to ±18 V.
- What is the quiescent supply current of the AD797?
The quiescent supply current of the AD797 is typically 10.5 mA for ±15 V supply.
- What are some common applications of the AD797 in medical and scientific fields?
The AD797 is used in ultrasound preamplifiers, seismic detectors, and spectrum analyzers due to its high precision and low noise characteristics.
- How does the AD797 achieve its high settling time accuracy?
The AD797 achieves a 16-bit settling time in less than 800 ns due to its single ultrahigh gain stage and advanced complementary bipolar (CB) process.
