ADS1146: ADS1146 pin capacitance

James Kiely

Part Number: ADS1146
Other Parts Discussed in Thread: ADS1246, ADS1147, ADS1248, ADS1148, ADS1247

Tool/software:

What is the pin capacitance of the SPI pins of the ADS1146. I have a number of devices on the SPI bus and I need to know that pin capacitance of every connected device in order to ensure that I have not exceeded the maximum allowable bus capacitance .

2 days ago

0 Bryan Lizon86 1 day ago

TI__Mastermind 38021 points

Hi James Kiely,

The pin capacitance for this family of devices (ADS1146, ADS1147, ADS1148, ADS1246, ADS1247, and ADS1248) is captured in the IBIS model: https://www.ti.com/lit/zip/sbam010

-Bryan

0 James Kiely 1 day ago in reply to Bryan Lizon86

Prodigy 20 points

Do I add the Package capacitance and the Pin capacitance or do I use just the Pin capacitance?

0 Bryan Lizon86 1 day ago in reply to James Kiely

TI__Mastermind 38021 points

Hi James Kiely,

Yes, you would add each pin capacitance together, then add the package capacitance, to determine the total capacitance contributed by the ADC. Then you would need to consider all of the board / trace capacitance as well

-Bryan

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ADS1146: ADS1146 pin capacitance