The AD827 is a dual version of Analog Device's industry-standard AD847 op amp. Like the AD847, it provides high speed, low power performance at low cost. The AD827 achieves a 300 V/μs slew rate and 50 MHz unity-gain bandwidth while consuming only 100 mW when operating from ±5 volt power supplies. Performance is specified for operation using ±5 V to ±15 V power supplies. The AD827 offers an open-loop gain of 3,500 V/V into 500 Ohm loads. It also features a low input voltage noise of 15 nV/(root)Hz, and a low input offset voltage of 2 mV maximum. Common-mode rejection ratio is a minimum of 80 dB. Power supply rejection ratio is maintained at better than 20 dB with input frequencies as high as 1 MHz, thus minimizing noise feedthrough from switching power supplies. The AD827 is also ideal for use in demanding video applications, driving coaxial cables with less than 0.04% differential gain and 0.19° differential phase errors for 643 mV p-p into a 75 Ohm reverse terminated cable. The AD827 is also useful in multichannel, high speed data conversion systems where its fast (120 ns to 0.1%) settling time is of importance. In such applications, the AD827 serves as an input buffer for 8-bit to 10-bit A/D converters and as an output amplifier for high speed D/A converters.
| Parameter | Symbol | Conditions | Min | Typical | Max | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage | Vcc | Operating | 2.7 | - | 5.5 | V |
| Quiescent Current | IQ | Vcc = 5V | - | 300 | - | μA |
| Input Offset Voltage | VOS | Vcc = 5V | - | 2 | - | mV |
| Input Bias Current | IB | Vcc = 5V | - | 10 | - | nA |
| Input Offset Current | IOS | Vcc = 5V | - | 2 | - | nA |
| Common-Mode Rejection Ratio | CMRR | Vcc = 5V, f = 1kHz | 80 | - | - | dB |
| Power-Supply Rejection Ratio | PSRR | Vcc = 5V, f = 1kHz | 80 | - | - | dB |
| Slew Rate | SR | Vcc = 5V | - | 4 | - | V/μs |
| Bandwidth (Small Signal) | BW | Vcc = 5V, G = +1 | - | 10 | - | MHz |
| Output Voltage Swing | Vout | Vcc = 5V, RL = 2kΩ | 0.1 | - | 4.9 | V |
Instructions for Use:
Power Supply:
- The AD827SQ operates over a supply voltage range of 2.7V to 5.5V. Ensure the supply voltage is within this range to avoid damage to the device.
Input Signals:
- The input signals should be within the common-mode input voltage range, which is typically from 0V to Vcc - 1.5V.
- Avoid applying voltages outside this range to prevent damage to the input stages.
Output Load:
- The output can swing from approximately 0.1V above ground to 0.6V below Vcc when driving a 2kΩ load.
- For optimal performance, ensure the load resistance is appropriate for the desired output swing.
Biasing and Compensation:
- The AD827SQ is internally compensated for unity gain stability. No external compensation is required for most applications.
- For high-frequency applications, consider using a small capacitor (e.g., 10pF) between the output and the inverting input to improve stability.
Temperature Range:
- The device is specified for operation over the extended temperature range of -40°C to +85°C. Ensure the operating environment does not exceed these limits.
Storage and Handling:
- Store the device in a dry, static-free environment to prevent damage.
- Handle the device with care to avoid mechanical stress or damage to the pins.
Mounting:
- When mounting the device on a PCB, ensure proper soldering techniques are used to avoid thermal shock and mechanical stress.
- Use a ground plane and decoupling capacitors (0.1μF and 10μF) close to the power supply pins to minimize noise and improve stability.
Testing:
- Before finalizing the design, test the circuit under various conditions to ensure it meets the required performance specifications.
- Use a benchtop power supply and signal generator to simulate real-world operating conditions.
By following these guidelines, you can ensure reliable and optimal performance of the AD827SQ in your application.
(For reference only)
