The recommended PCB layout for the MAX908CPD+ is to use a 4-layer board with a solid ground plane, and to keep the analog and digital signals separate to minimize noise and interference. Additionally, it's recommended to use a low-ESR capacitor for the VCC pin and to decouple the VCC pin with a 0.1uF capacitor.
To optimize the performance of the MAX908CPD+ in a noisy environment, it's recommended to use a shielded cable for the input signal, to use a common-mode choke to filter out common-mode noise, and to add a low-pass filter to the output signal to filter out high-frequency noise. Additionally, it's recommended to use a low-noise power supply and to keep the MAX908CPD+ away from other noisy components.
The maximum input signal amplitude that the MAX908CPD+ can handle is ±5V, but it's recommended to keep the input signal amplitude below ±3V to ensure optimal performance and to prevent damage to the device.
The gain of the MAX908CPD+ can be programmed using the GAIN pin, which is a 3-state input that allows the user to select one of three gain settings: 1V/V, 2V/V, or 4V/V. The gain setting is determined by the voltage level on the GAIN pin, which can be connected to VCC, GND, or left floating.
The output impedance of the MAX908CPD+ is typically around 100Ω, but it can vary depending on the output load and the frequency of the signal. It's recommended to use a buffer amplifier or a voltage follower to drive a low-impedance load or to improve the output impedance matching.
MAX908CPD+ datasheet
by Maxim Integrated Products
