• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 46 subscribers
  • Views 419 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ADS1118: how to connect multiple ADS1118 to an MCU?

Howard Zou
Genius 12365 points
Part Number: ADS1118


Hi,

in datasheet figure 45. 50 Ohm is placed between SPI port of MCU and ADS1118.

If multiple ADS1118 are needed, do we need multiple 50 Ohm, or we only need 4 50 Ohm?

What's the purpose of the 50 Ohm?

  • 0
    TI__Guru* 98195 points
    Howard,


    The main reason to use the resistors is because of signal integrity. If you have long traces on the board, with some inductance and capacitance, you may get some ringing on the digital lines. The series resistance will act to reduce this LC ringing and prevent any overshoot from causing glitches in digital signals.

    For multiple devices, you would still just use a single 50Ω resistor for each line. This is shown in figure 48 of the datasheet.


    Joseph Wu