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What's wrong with RXCML in AD9963?

Question asked by rainustc on May 1, 2013
Latest reply on May 1, 2013 by larrywelchusa

Hi,

   Everyone!

   I'm using AD9963 just like the datasheet(AD9963BCPZR) shows in Figure 42, DC-Coupled with ADA4937, but when I first use the spetial sequence to configure RXCML like this

   addr  value

   0x05 0x03

   0x0F 0x02

   0xFF 0x01

   0x05  0x00

  

  With the external 32MHz CMOS clock , I  see a  ~17.6MHz clock on RXCML pin, but not the 1.4V voltage, I really don't konw what's wrong  with RXCML pin configuration , Can I get some suggestion from Analog?

  

   In the following, If I confiure addr 0x7e to 0x01, I can see a 1.76V DC voltage on RXCML, so, if this is right, Can I use this common voltage to drive ADA4937 with AD9963?

  

   

   Best Reguards!

   From Rain

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