- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hello! I'm using C8C3446PVI-076 IC. Are there any ways to get VDDA/2 reference input voltage on pin without using internal opamp?I've used both available opamps in my design and can't use another one for reference voltage. Are thre eny other solutions rather than making external voltage reference for 3.3/2 with stabilitron? Thanks in advance.
- Labels:
-
PSoC 3
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Just use a Vref component. Note that it has a high internal impedance, so you might probalby need an external OpAmp. You could also use a VDAC, but it has the same impedance problem.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Since you are probably using a stabilized VDD it is very easy to derive a VDD/2 with a resistor network. Is there any reason why you do not use that for reference?
Bob
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Unfortunately, using simple resistor divider won't work :(. The voltage on it drops to 0.6-0.8V when I'm trying to use it as Vref. I'm trying to implement AN60594 (but for higher frequencies), but CY8C34 has only two opamps available.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
If you can burn power scale the absolute value of the external R's in the
divider down to function more as a V source.
Or can you mux one of the OpAmps and Ref from one measurement
to another, eg. double duty the HW needed ?
Regards, Dana.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
This -
Or can you mux one of the OpAmps and Ref from one measurement
to another, eg. double duty the HW needed ?
should have been stated as this -
Or can you mux one of the OpAmps and Ref from one measurement
to another, eg. double duty the HW used ?