Part Details for AD828AN by Analog Devices Inc

The AD828AN is a high-gain, high-impedance amplifier, so it's crucial to follow proper layout and placement guidelines to minimize noise and ensure optimal performance. Place the AD828AN close to the signal source, use a ground plane, and keep the input traces short and shielded. Avoid running digital lines near the analog signal paths, and use decoupling capacitors to filter out noise.

The gain resistor (Rg) sets the gain of the AD828AN. To choose the correct gain resistor, calculate the desired gain using the formula: Gain = 1 + (Rf/Rg), where Rf is the feedback resistor. Select a gain resistor that provides the desired gain while ensuring the amplifier remains stable. A higher gain resistor value results in higher gain, but may compromise stability.

The AD828AN can handle input voltages up to ±15V, but it's essential to ensure that the input voltage does not exceed the supply voltage (±Vs) to prevent damage. If the input voltage exceeds the supply voltage, use input protection circuitry, such as clamping diodes or resistors, to limit the voltage and prevent damage.

To reduce noise and oscillations, use a low-noise power supply, decouple the power supply lines with capacitors, and add a noise filter (e.g., RC filter) at the input. Additionally, ensure the layout is well-shielded, and use a ground plane to reduce electromagnetic interference (EMI). You can also add a ferrite bead or a common-mode choke to the input lines to filter out high-frequency noise.

The settling time of the AD828AN is typically around 1-2 microseconds, depending on the gain and input signal frequency. This settling time can affect applications that require fast signal acquisition or high-speed data conversion. To minimize the impact of settling time, ensure that the input signal is stable and the amplifier has sufficient time to settle before taking measurements or converting the signal.