LM89-1CIMMX/NOPB datasheet by Texas Instruments

LM89-1CIMMX/NOPB Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal thermal performance?
  Texas Instruments recommends a 2-layer or 4-layer PCB with a solid ground plane and a thermal relief pattern around the device to ensure optimal thermal performance. A detailed layout guide can be found in the application note 'LM89 Thermal Layout Guidelines' (SLUA434).
• How do I ensure accurate temperature measurement in a noisy environment?
  To ensure accurate temperature measurement in a noisy environment, it is recommended to use a low-pass filter on the VOUT pin, such as a 1 kΩ resistor and a 10 nF capacitor. Additionally, the device should be placed away from noise sources and shielded cables should be used for connections.
• What is the maximum cable length for the remote temperature sensing pins?
  The maximum cable length for the remote temperature sensing pins (V+ and V-) is dependent on the cable capacitance and the noise environment. As a general guideline, Texas Instruments recommends keeping the cable length below 10 inches (25 cm) to ensure accurate temperature measurement.
• Can I use the LM89-1CIMMX/NOPB in a high-temperature environment?
  The LM89-1CIMMX/NOPB is rated for operation up to 150°C, but the device's accuracy and reliability may be affected at high temperatures. It is recommended to derate the device's specifications according to the temperature derating curve provided in the datasheet.
• How do I calibrate the LM89-1CIMMX/NOPB for high-accuracy temperature measurement?
  The LM89-1CIMMX/NOPB does not require calibration for typical temperature measurement applications. However, for high-accuracy applications, Texas Instruments recommends using a calibration procedure outlined in the application note 'LM89 Calibration Procedure' (SLUA435).