Questions Regarding Schematic Files and their Contents


#1

Hi Dear All friends
I have two questions about some parts of schematic files
1- in the powe page, there are some capesitors which are connected
between
GND and different Voltages (DVDD, VDD5:1,…), I tend to know if there
is
any relationship between the number of capecitors and the voltage which
is
connected to them and GND? for instance I could figure out that the
number
of capecitors which are connected to DVDD:1 and GND is 24 while the
number
of pins are 12 (12 220pF and 0.1uF pair), however for VCC1:5 I could not
found exact relationship! can anybody help me in this issue?
2- some of the values for resistors are not clear for instance in
clocking page of schematic resistors which are connected to S[0…10]
pins of
AD9513 have no distict value. I’m wondering if anyone can help me
regarding
this problem!
Thnaks
Regards


#2

Fahimeh Rezaei wrote:

Hi Dear All friends
I have two questions about some parts of schematic files
1- in the powe page, there are some capesitors which are connected
between GND and different Voltages (DVDD, VDD5:1,…), I tend to know
if there is any relationship between the number of capecitors and the
voltage which is connected to them and GND? for instance I could figure
out that the number of capecitors which are connected to DVDD:1 and GND
is 24 while the number of pins are 12 (12 220pF and 0.1uF pair), however
for VCC1:5 I could not found exact relationship! can anybody help me in
this issue?

We try to get at least one cap per power pin, but sometimes there are
more or less.

2- some of the values for resistors are not clear for instance in
clocking page of schematic resistors which are connected to S[0…10]
pins of AD9513 have no distict value. I’m wondering if anyone can help
me regarding this problem!

The AD9513 datasheet will give you enough information to figure out
which resistors are populated and which are not.

Matt