[SI-LIST] Re: Calculating Zin for a DSP Clock
- From: "Tom Dagostino" <tom@xxxxxxxxxxxxxxxxx>
- To: <HUBING@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 21 Nov 2014 11:19:59 -0800
Todd, well yes and no. This part seems to specify the clock input of 25 MHz or
a period of 40 nsec. I'll bet that period is much longer than the electrical
length of the net so for 25 MHz it could be a good approximation of the input
impedance.
Tom Dagostino
Teraspeed Labs
9999 SW Wilshire Street
Suite 102
Portland, OR 97225
tom@xxxxxxxxxxxxxxxxx
www.teraspeedlabs.com
971-279-5325 office
503-430-1065 cell
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Todd Hubing
Sent: Friday, November 21, 2014 10:29 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Calculating Zin for a DSP Clock
Jesús,
Even if you have the correct values for L_pin and C_pin, the equation you cite
cannot be used to calculate the input impedance.
Todd Hubing
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Jesús Castañé
Sent: Friday, November 21, 2014 4:49 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Calculating Zin for a DSP Clock
Hi Experts,
I'm trying to calculate the Zin for the CLK in the ADSP21469.
As far as I know I can use the next equation (Sorry for the plain text
format)
Zin= srqt [L_pin / (C_pin + C_comp ) ]
I have tried to find this parameters in the IBIS model but L_pin and C_pin are
defined as N/A
L1 CLKIN PDXO01DG NA NA NA
You can find the IBIS model in this link.
http://www.analog.com/static/imported-files/ibis_models/ad2146x_cspBGA_ibs_ver.1.3.txt
Why are these parameters defined as N/A? What am I missing?
Thank you so much for your help. I find this list really interesting.
Regards,
Jesús Castañé
uk.linkedin.com/in/jesusalbertocastanemartinez/
-
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