We have downloaded the design sources of ADC9680CE04B from analog wiki.The download link is : https://wiki.analog.com/resources/eval/ad9680-1000ebz.
There are more mismatches between Schematic and BOM.
1.For example U402 in schematic it is indicated as ADM7160AUJZ-1.8 and in BOM it is ADP170AUJZ-1.25-R7. This is SPI power supply to AD9680. The output is always 1.25v beacuse of wrong part number. In AD9680 datasheet minimum Supply volatge to SPI is 1.8V.
2.In Schematic R416, R418, R420, R430 and R432 value is 66.5K but in BOM these are 56K.
We would like to know the design sources are latest or not.
Thanks & Regards
(1) SPIVDD supports 1.25V also. So you can use either ADM7160 or ADP170. If you look at their schematics they both are pin compatible.
(2) The actual value is 56K. Follow the BOM.
The design files…
Hello Rama Krishna,
SPIVDD supports 3.3V, so your proposal is ok. But SPIVDD can also be run at 1.25V if needed. We have characterized it to run at 1.25V.
I used 86.6k because the 1.25V domain had ferrite…
@Thanks for the quick Response.
Due to logistic issues we made eval board from the sources given by ADI.
In the data sheet it is mentioned that it works from 1.7V to 3.3 Volts. So we are planning to remove the U402 and connect(short) pins1&5 so that we can use 3.3v as VDDSPI.
Please confirm it will work for 1.25v ? If it works then we will not go for reassembly.
In the schematic R417 mentioned as 100K and in the BOM it is 86.6K. If we are going for 86.6K then output volatge is
0.5*(1+(86.6K/56K)) = 1.273v .
Can we go for 84.5K(output voltage is 1.254v)instead of 86.6K?
In the Schematic C700 capacitor for External refclk to FPGA not indiacted as DNI, but in BOM it is DNI.
please let me know whether we have to assemble C700 or not?