AD9576 no output on my board

Question

Hi ADI experts, 
 
 Now I'm using AD9576 on my self-designed PCB. I set PPR0=0, PPR2=0, PPR3=2. Use a XTAL for REF0. FER1 and REF2 are all floating. 
 Use an external RC delay for /RESET pin. 
 A single 3.3V for all power pins. 
 After power on, there is no output on any output pins. The XTAL doesn't have any signal measured by oscilloscope. 
 
 We also try to communicate with AD9576 by I2C(There are pull up resistors to 3.3V at master side), but no ACK is received from AD9576. Also, after I2C communication try fail, the I2C bus will be hold at about 1.7V level. 
 
 I don't know why. Thank.

pminc48 · Accepted Answer

Hi, 
 I recommend buying an AD9576 evaluation board and try the configuration on that board first. 
 Convince yourself that the AD9576 functions as desired and then try it on your board. 
 Take out the RC delay and just drive RESETB first low and then high with a minimum pulse of 1.25ns: 
 
 Did you copy the schematic from the AD9576 eval board? 
 https://www.analog.com/en/resources/evaluation-hardware-and-software/evaluation-boards-kits/eval-ad9576.html#eb-overview 
 
 Petre)

Partner Forums

Partner Libraries

Products Mentioned

AD9576 no output on my board