ADS1118: Multiple Chips | SPI capacitance

Hello,

Magdy Mag said:

i would like to connect 5 Chips of ADS1118 to DSPIC33, and i didn't find any data on the SPI capacitance ?

Please see the following previous post that answers this question: https://e2e.ti.com/support/data-converters-group/data-converters/f/data-converters-forum/744715/ads1118-input-capacitance-of-digital-signals?tisearch=e2e-sitesearch&keymatch=capacitance# The capacitance for the digital communication pins is typically close to 3pF.

Magdy Mag said:

do you recommend connecting that many IC chips on same SPI bus or not recommended ?

Connecting 6 chips to the same SPI bus shouldn't be a problem, although it generally depends what speed you wish to use and how much impedance is presented by the SPI bus to the devices driving the bus. The main limitation you will probably encounter is that each device will need a separate GPIO line to activate the devices using the Chip Select (CS) pin.

Let me know if you have any more questions about this,

Levi DeVries