Just wondered if the USBi programmer can supply the clock to the AD1940 / 1 to initialize the chip or if I need to supply an additional external mclk ? I see on the schematic of the USBi there is a 24mhz crystal but it doesn't quite divide into the 48khz or 96khz x FS clock speed I would select on the PLL pins of the IC.
I guess I'll hook another clock from a codec and see if that works. chip not initializing with USBi alone.
just thought someone might know the answer already ? the Eval boards are using the master clocks generated from Codecs it seams.
thanks , ben
Just to say the chip is now working. I set the PLL_CTRL with a 10k resistor to correct multiplyer for FS and added the master clock. now I can program the chip with the USBi board.