Texas Instruments recommends a star-ground configuration, with the device placed close to the analog power supply pins. Additionally, it's essential to keep the analog and digital grounds separate and connected only at the power supply. A solid ground plane and proper decoupling capacitors are also crucial for optimal performance.
The LMC6762AIM/NOPB operates from a single supply voltage of 2.7V to 5.5V. Ensure the power supply voltage is within this range and that the device is operated within the recommended temperature range of -40°C to 125°C. It's also essential to follow proper power-up and power-down sequencing to prevent damage to the device.
When selecting external components, consider the device's operating frequency, input impedance, and output impedance. Choose resistors with low tolerance and temperature coefficients, and capacitors with low equivalent series resistance (ESR) and high reliability. Additionally, ensure the components are rated for the operating voltage and temperature range of the device.
To troubleshoot oscillations or instability, check the device's power supply voltage, decoupling capacitors, and ground connections. Ensure the device is properly bypassed, and the power supply is clean and stable. Also, verify that the input and output impedances are properly matched, and the device is operated within its recommended operating conditions.
When designing the PCB, ensure the device is placed in a quiet area of the board, away from high-frequency signals and noise sources. Use a solid ground plane, and keep the analog and digital signal traces separate. Additionally, use a multi-layer board with a dedicated power plane and a solid ground plane to minimize noise and ensure optimal performance.
LMC6762AIM/NOPB datasheet
by Texas Instruments
