Overview
The AD825AR-REEL, produced by Analog Devices Inc., is a highly optimized operational amplifier designed for high-speed, low-cost, and excellent DC parameters. This amplifier is well-suited for a broad range of signal conditioning and data acquisition applications. It features a unique input stage with ultralow input bias current and input current noise, ensuring stable gain under varying load conditions and no phase reversal even when inputs exceed the power supply voltages. The AD825 is available in various packages, including 8-lead and 16-lead SOIC, making it versatile for different design needs.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Unity Gain Bandwidth | 18 | 21 | - | MHz |
| Bandwidth for 0.1 dB Flatness (Gain = +1) | 8 | 10 | - | MHz |
| -3 dB Bandwidth (Gain = +1) | 34 | 37 | - | MHz |
| Slew Rate (RLOAD = 1 kΩ, G = -1) | 115 | 130 | - | V/µs |
| Settling Time to 0.1% (-2.5 V to +2.5 V) | 75 | 90 | - | ns |
| Settling Time to 0.01% (-2.5 V to +2.5 V) | 90 | 110 | - | ns |
| Total Harmonic Distortion (FC = 1 MHz, G = -1) | -76 | - | - | dB |
| Input Bias Current | - | 20 pA | - | pA |
| Input Voltage Noise | - | 12 nV/√Hz | - | nV/√Hz |
| Output Current | 50 | - | - | mA |
| Supply Voltage Range | ±5 V | - | ±18 V | V |
| Operating Temperature Range | -40°C | - | 85°C | °C |
| Package Type | - | 8-SOIC, 16-SOIC | - | - |
Key Features
- High Speed and Low Distortion: The AD825 offers high-speed performance with a unity gain bandwidth of 18 MHz to 21 MHz and low distortion of -76 dB at 1 MHz.
- Low Input Bias Current and Noise: It features an ultralow input bias current of 20 pA and input current noise of 10 fA/√Hz, making it suitable for high-sensitivity applications.
- High Output Drive Capability: The amplifier can drive heavy capacitive or resistive loads with a minimum output current of 50 mA and no phase reversal when the input is at rail.
- Stable Gain and Bandwidth: The gain and bandwidth are stable over temperature and under varying load conditions, ensuring reliable performance in diverse environments.
- Robust Power Supply Rejection: The AD825 has a high power supply rejection ratio (PSRR) of 76 dB to 88 dB, ensuring minimal impact from power supply variations.
Applications
- CCDs and Imaging Systems: The AD825 is suitable for charge-coupled device (CCD) applications due to its low noise and high stability.
- Low Distortion Filters and Mixed Gain Stages: Its high speed and low distortion make it ideal for filter circuits and mixed gain stages.
- Audio Amplifiers: The amplifier's low noise and high drive capability make it a good choice for audio applications.
- Photo Detector Interfaces: It is used in photo detector interfaces due to its low input bias current and high sensitivity.
- ADC Input Buffers and DAC Output Buffers: The AD825 is suitable for buffering analog-to-digital converter (ADC) inputs and digital-to-analog converter (DAC) outputs due to its high accuracy and stability.
Q & A
- What is the unity gain bandwidth of the AD825?
The unity gain bandwidth of the AD825 is between 18 MHz and 21 MHz.
- What is the input bias current of the AD825?
The input bias current of the AD825 is 20 pA.
- Can the AD825 drive heavy capacitive loads?
Yes, the AD825 can drive unlimited capacitance loads without phase reversal.
- What is the operating temperature range of the AD825?
The operating temperature range of the AD825 is from -40°C to 85°C.
- What are the typical supply voltages for the AD825?
The AD825 can operate with supply voltages ranging from ±5 V to ±18 V.
- What is the slew rate of the AD825?
The slew rate of the AD825 is between 115 V/µs and 130 V/µs.
- 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.
- Is the AD825 available in different package types?
Yes, the AD825 is available in 8-lead and 16-lead SOIC packages.
- 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, ADC input buffers, and DAC output buffers.
- Does the AD825 have a high power supply rejection ratio?
Yes, the AD825 has a high power supply rejection ratio (PSRR) of 76 dB to 88 dB.
