After looking at the datasheet and the evaluation oard user guide, I did find something in the engineerzone:
post #10 suggests that I issue a reset first and then toggle on of the PS lines to generate a fud internally on the chip.
the attached waveform diagram shows the timing of the signals I'm sending from the ML605 to the AD9857 EVB.
I issue a reset then send a x01 to the ad8957 via the spi bus followed by x04. I then toggle PS0 but I do not see a
change in voltage across the dac reset resistor (R5/R6).
Jumper settings on the board are as follows:
W1 and W13 set to PC Disable since I am using the U10 header and not a PC to control the board.
W3 jumper is across pins 1 and 4
W5 jumper is across the bottom two pins
W4 jumpers is across the left 2 pins for DAC current = 20mA
W12 jumper is across the 2 pins on the right
W2 no jumpers are installed
W11 jumper is across the left and center pins, tied to GND
W7 jumper is across the top 2 pins (store shunt)
I have a 10MHz oscillator on J1 and I am/will be looking for an output on J2 when I try to put the chip in
single tone mode.
Any help would be appreciated.