Overview
The AD825ARZ, produced by Analog Devices Inc., is a high-speed, low-cost operational amplifier designed for a wide range of signal conditioning and data acquisition applications. This general-purpose JFET input amplifier is optimized for high performance, stability, and low distortion, making it suitable for various demanding environments. The AD825 features a unique input stage with ultralow input bias current and input current noise, ensuring stable operation even when input signals approach the power supply rails without causing phase reversals at the output.
Key Specifications
| Parameter | Conditions | Typical Value | Unit |
|---|---|---|---|
| Unity Gain Bandwidth | VS = ±5 V | 21 MHz | MHz |
| Bandwidth for 0.1 dB Flatness (Gain = +1) | VS = ±5 V | 10 MHz | MHz |
| -3 dB Bandwidth (Gain = +1) | VS = ±5 V | 37 MHz | MHz |
| Slew Rate | RLOAD = 1 kΩ, G = -1, VS = ±5 V | 130 V/µs | V/µs |
| Settling Time to 0.1% | -2.5 V to +2.5 V, VS = ±5 V | 90 ns | ns |
| Settling Time to 0.01% | -2.5 V to +2.5 V, VS = ±5 V | 110 ns | ns |
| Total Harmonic Distortion | FC = 1 MHz, G = -1, VS = ±5 V | -76 dB | dB |
| Input Bias Current | 15 pA | pA | |
| Input Capacitance | 6 pF | pF | |
| Output Current | VS = ±5 V | 50 mA | mA |
| Output Voltage Swing | RLOAD = 500 Ω, VS = ±5 V | ±3.2 V | V |
| Power Supply Voltage | ±5 V to ±18 V | V | |
| Quiescent Current | VS = ±5 V | 6.8 mA | mA |
Key Features
- High Speed and Low Distortion: The AD825 offers high unity gain bandwidth (21 MHz) and low total harmonic distortion (-76 dB at 1 MHz), making it ideal for high-speed applications.
- High Output Drive Capability: It can drive unlimited capacitance loads and deliver up to 50 mA of output current, ensuring robust performance under various load conditions.
- No Phase Reversal: The amplifier maintains stable output even when input signals exceed the power supply rails, preventing phase reversals.
- Low Input Bias Current: With an input bias current of 15 pA, it is suitable for applications requiring minimal input current.
- Stable Gain Under Varying Load Conditions: The AD825 maintains stable gain across different load conditions, ensuring consistent performance.
- Wide Operating Temperature Range: It operates from -40°C to +85°C, making it versatile for various environmental conditions.
Applications
- CCDs (Charge-Coupled Devices): The AD825 is suitable for CCD applications due to its high speed and low distortion.
- Low Distortion Filters: Its low distortion characteristics make it ideal for filter applications.
- Mixed Gain Stages: The amplifier can be used in various gain stages due to its stable gain and high bandwidth.
- Audio Amplifiers: It is used in audio applications requiring high fidelity and low distortion.
- Photo Detector Interfaces: The AD825 is suitable for photo detector interfaces due to its low noise and high speed.
- ADC Input Buffers and DAC Output Buffers: It is used to buffer inputs and outputs of analog-to-digital converters (ADCs) and digital-to-analog converters (DACs) respectively.
Q & A
- What is the typical unity gain bandwidth of the AD825?
The typical unity gain bandwidth of the AD825 is 21 MHz.
- What is the maximum output current of the AD825?
The AD825 can deliver up to 50 mA of output current.
- Does the AD825 suffer from phase reversal when input signals exceed the power supply rails?
No, the AD825 does not suffer from phase reversal even when input signals exceed the power supply rails.
- What is the input bias current of the AD825?
The input bias current of the AD825 is 15 pA.
- What is the operating temperature range of the AD825?
The AD825 operates from -40°C to +85°C.
- Can the AD825 drive heavy capacitive loads?
Yes, the AD825 is designed to drive heavy capacitive loads without stability issues.
- What are some common applications of the AD825?
The AD825 is commonly used in CCDs, low distortion filters, mixed gain stages, audio amplifiers, photo detector interfaces, and as buffers for ADCs and DACs.
- What is the typical quiescent current of the AD825?
The typical quiescent current of the AD825 is 6.8 mA when operated with ±5 V power supply.
- What is the total harmonic distortion of the AD825 at 1 MHz?
The total harmonic distortion of the AD825 at 1 MHz is -76 dB.
- What package options are available for the AD825?
The AD825 is available in 8-lead SOIC and 16-lead SOIC packages.
