The recommended PCB layout for the MX7248JN+ is to use a 4-layer board with a solid ground plane on the bottom layer, and to keep the analog and digital signals separate to minimize noise and interference.
To ensure the accuracy of the temperature measurement, it is recommended to use a thermocouple with a high accuracy rating, and to calibrate the MX7248JN+ using a known temperature reference point. Additionally, the thermocouple should be connected to the MX7248JN+ using a shielded cable to minimize noise and interference.
The maximum cable length for the thermocouple connection depends on the type of thermocouple and the noise environment. As a general rule, it is recommended to keep the cable length as short as possible, but a maximum length of 10 feet (3 meters) is typically acceptable. Longer cable lengths may require additional noise filtering or shielding.
The MX7248JN+ has an internal CJC circuit that can be enabled or disabled depending on the application. If the CJC is enabled, the MX7248JN+ will automatically compensate for the temperature of the cold junction. If the CJC is disabled, the user must provide an external CJC circuit or compensate for the cold junction temperature in software.
The POR timing for the MX7248JN+ is typically around 10ms, but this can vary depending on the power supply and the specific application. It is recommended to wait for at least 10ms after power-on before accessing the MX7248JN+ to ensure that it has completed its internal initialization.
MX7248JN+ datasheet
by Maxim Integrated Products
