A good PCB layout for the LTC1658CMS8#TRPBF involves keeping the analog and digital grounds separate, using a solid ground plane, and minimizing noise coupling between the analog and digital sections. A 4-layer PCB with a dedicated analog ground plane is recommended.
To ensure accurate temperature measurement, it's essential to calibrate the device, use a high-accuracy voltage reference, and minimize thermal gradients on the PCB. Additionally, ensure that the thermistor is properly connected and that the device is operated within its specified temperature range.
The maximum cable length for the SPI interface of the LTC1658CMS8#TRPBF depends on the clock frequency and the signal integrity. As a general guideline, a cable length of up to 10 inches (25 cm) is recommended for clock frequencies up to 1 MHz. For longer cable lengths, consider using a buffer or a repeater to maintain signal integrity.
To ensure proper operation, power up the voltage reference (VREF) before powering up the LTC1658CMS8#TRPBF. When powering down, turn off the VREF last. This sequencing helps prevent latch-up and ensures that the device powers up and down correctly.
A decoupling capacitor value of 0.1 μF to 1 μF is recommended for the LTC1658CMS8#TRPBF. This capacitor should be placed as close as possible to the device's power pins to filter out noise and ensure stable operation.
LTC1658CMS8#TRPBF datasheet
by Linear Technology
