Overview
The AD797AR-REEL7, manufactured by Analog Devices, Inc., is a very low noise, low distortion operational amplifier (op-amp) designed for use as a preamplifier. It is renowned for its exceptional performance in various analog signal processing applications. The AD797 features a low noise level of 0.9 nV/√Hz and a low total harmonic distortion of −120 dB in audio bandwidths, making it ideal for preamps in microphones, mixing consoles, and other high-fidelity audio systems. Its high slew rate of 20 V/μs and a gain bandwidth of 110 MHz further enhance its suitability for applications requiring high-speed signal processing and amplification.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | ±4.5 V | ±18 V | V | |
| Input Offset Voltage (Vos) | 25 | 80 | μV | |
| Input Bias Current (Ib) | 0.25 | 1.5 | μA | |
| Input Noise Voltage (en) | 0.9 | nV/√Hz (1 kHz) | ||
| Gain Bandwidth Product (GBW) | 75 MHz | MHz (AV = 1, RL = 2 kΩ) | ||
| Slew Rate (SR) | 20 V/μs | V/μs (AV = 1, VOUT = ±10 V) | ||
| Input Resistance (Differential) | 7.5 kΩ | kΩ | ||
| Input Capacitance (Differential) | 20 pF | pF | ||
| Output Resistance | 3 mΩ | mΩ (AV = 1, f = 1 kHz) | ||
| Quiescent Current | 8.2 mA | 10.5 mA | mA (±5 V, ±15 V) | |
| Operating Temperature Range | −40°C | +85°C | °C |
Key Features
- Very low noise of 0.9 nV/√Hz and low total harmonic distortion of −120 dB in audio bandwidths.
- High slew rate of 20 V/μs and a gain bandwidth of 110 MHz.
- Excellent DC precision with a maximum input offset voltage drift of 1.0 μV/°C.
- High output drive current of up to 50 mA.
- Specified power supply voltage range of ±5 V to ±18 V.
- Fast 16-bit settling time, making it ideal for buffering inputs to Σ-Δ ADCs and outputs of high-resolution DACs.
- Differential input resistance of 7.5 kΩ and common-mode input resistance of 100 MΩ.
- Differential input capacitance of 20 pF and common-mode input capacitance of 5 pF.
Applications
- Professional audio preamplifiers and mixing consoles.
- Infrared (IR) and sonar imaging systems.
- Low-frequency ultrasound applications.
- Buffering inputs to Σ-Δ ADCs and outputs of high-resolution DACs, particularly in seismic detection and spectrum analyzers.
- General-purpose amplification where low noise, low distortion, and high precision are essential.
Q & A
- What is the typical input noise voltage of the AD797?
The typical input noise voltage of the AD797 is 0.9 nV/√Hz at 1 kHz.
- What is the slew rate of the AD797?
The slew rate of the AD797 is 20 V/μs.
- What is the gain bandwidth product of the AD797?
The gain bandwidth product of the AD797 is at least 75 MHz for AV = 1 and RL = 2 kΩ.
- What is the maximum input offset voltage drift of the AD797?
The maximum input offset voltage drift of the AD797 is 1.0 μV/°C.
- What is the output drive current capability of the AD797?
The AD797 can drive an output current of up to 50 mA.
- What are the typical operating supply voltages for the AD797?
The AD797 can operate with supply voltages ranging from ±4.5 V to ±18 V.
- What are some common applications of the AD797?
The AD797 is commonly used in professional audio preamplifiers, IR and sonar imaging systems, low-frequency ultrasound applications, and as a buffer for Σ-Δ ADCs and high-resolution DACs.
- What is the differential input resistance of the AD797?
The differential input resistance of the AD797 is 7.5 kΩ.
- What is the common-mode input resistance of the AD797?
The common-mode input resistance of the AD797 is 100 MΩ.
- What is the maximum operating temperature range for the AD797?
The AD797 operates within a temperature range of −40°C to +85°C.
