ADS1110: Input capacitance

Daniel Vasher

Intellectual 1135 points

Part Number: ADS1110
Other Parts Discussed in Thread: TMP100

Hello all,

What is the input capacitance for the ADS1110 I2C Pins?

or is there a formula to determine this?

over 9 years ago

0 Joseph Wu over 9 years ago

TI__Guru** 101295 points

Daniel,

I wasn't able to find specific data for the capacitance for I2C pins of the ADS1110. However, it can be calculated from details in the IBIS model from a similar design (same process, package, pin structures, etc). I used the TMP100 which is very similar to the ADS1110. I get an SCL pin capacitance of about 4.3pF and an SDA pin capacitance of about 5.1pF.

If you're curious about the method of calculation, there's an article from Bonnie Baker on using IBIS models to calculate the pin capacitance:

www.edn.com/.../518558-Signal_integrity_and_characteristic_impedance.php

Joseph Wu

0 Joseph Wu over 9 years ago in reply to Joseph Wu

TI__Guru** 101295 points

Daniel,

Someone pointed out that the link I gave was broken. Here's a new link:

www.edn.com/.../Signal-integrity-and-characteristic-impedance

Joseph Wu

0 Daniel Vasher over 9 years ago in reply to Joseph Wu

TI__Intellectual 1135 points

Thanks Joseph

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ADS1110: Input capacitance