PCMD3140: Drive strength of PCMD3140

Tsugumi Murata

Part Number: PCMD3140

Hello,

Related to previous question I asked here (E2E) , I want to know the drive strength value for this chip.

I understand that this is not configurable, and we have a workaround to solve the issue but for future reference we are looking for a numeric value.

Sincerely,

Tsugumi

0 Sanjay Dixit over 1 year ago

2,ma

0 Tsugumi Murata over 1 year ago in reply to Sanjay Dixit

Hello Sanjay,

Thanks for the response. As a follow up question, what is the slope here? (mA / s)

0 Sanjay Dixit over 1 year ago in reply to Tsugumi Murata

You should be able to drive 2ma continuously from the pin.

0 Tsugumi Murata over 1 year ago in reply to Sanjay Dixit

Hello Sanjay,

Thank you for the response. Just to get clarification, every pin on this chip has drive strength of 2mA?

So for the PDMCLK pin , since the rise time is max 18ns , the edge is driven at minimum slope of 2mA / 18ns ?

+1 Sanjay Dixit over 1 year ago in reply to Tsugumi Murata

2ma is the DC Drive.

We can as an approximation determine the drive strength on the edges. Please refer to the figure below.

With a 20 pf load,a 3.3v pulse goes from 10%-90% in 18ns.

10-90% is 3.3*.8=2.64v.

V=I/C*T

2.64+I/20pf*18ns

I=2.9ma.

0 Tsugumi Murata over 1 year ago in reply to Sanjay Dixit

Makes sense, thank you.

Audio forum