My first SigmaDSP Schematic!
Hello everybody!
I have just drawn the schematic for the adau1701. It is shameful to confess, especially on the engineer forum, but the thing is, this is the second schematic I have ever drawn in my life and the first, which uses so many components. Because of that I am terribly afraid of making an error and probably the schematic is also drawn ugly. If I am not asking for too much, may I post it here and ask somebody just look at it just to check for something terrible? Please!!
The 1701 is supposed to work only in self-boot mode, with occasional connection to the USB port. The frequencies I will use climb up as high as to about 90Khz. outputs will go directly to a high-voltage op-amp, the other two - to a headphone amp. I read that there is a convention while drawing schematics group pins like inputs with inputs, power with power etc., but since I have no experience with drawing, I decided to draw the models as they will be on the board, i.e. all the pins are place as they are on the actual IC. Because otherwise when I draw the board layout, I am afraid of being confused and lost. Brr... Scary... Have never done it before.
Thanks in advance!!
Audio Signal Processors
SigmaDSP Audio Processors
adau1701
Sorry a follow-up question. I just couldn't really get it, when I make a board layout, should I grasp all the DGND, AGND, PGND pins and route them all to a single point, which is in turn connected to the AGND plane, or I must connect each pair DGND-AGND together and then to the AGND plane in several different places? For example, connect pins 1 and 48 together and then connect this pair to the AGND plane, then connect pins 36-37 together and then connect this pair also to AGND plane, but in a different spot on the board. OR, I connect pins 1-48-36-37... all together and then tie them all to a single spot on the AGND plane. Sorry probably somewhat clumsy explanation, but I do not know how to utter it better.
Hi,
I would recommend that you use one single GND net for the entire board. Each power supply decoupling capacitor should be placed adjacent to a power and GND pin pair, using the capacitor to provide an AC short between the pins, and then connecting directly to the power and ground planes. Please see Page 87 of thie ADAU1442 datasheet:
http://www.analog.com/static/imported-files/data_sheets/ADAU1442_1445_1446.pdf
Best regards,
Coleman
Thank you Coleman!
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