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AD9789 QDUC mode

Question asked by Shaharm on Sep 10, 2013
Latest reply on Nov 4, 2013 by danf

Hi,

 

I want to use the AD9789 as D/A and send 5bit of digital data as input.

When "00000" represent 0V,and "11111" represent 1V.

I configure the AD9789 to QDUC mode, bypassed the QAM modulator and SRRC filter and configure the NCO and BPF to 50MHz carrier freq.

The data source is FPGA and the digital data output clock is 40MHz.

The 5 bits are connected to AD9789 D[30:26].but the output signal is not as I expected.

 

Do I need to use FS or DCO signals  to sample the data from the source(FPGA)?

 

Can you review my register settings?

 

0x0=0x10

0x1=0x0

0x2=0x0

0x3=0xc

0x4=0x8

0x5=0x1

0x6=0xc3

0x7=0x7

0x8=0x18

0x9=0x8

0xa=0x55

0xb=0x55

0xc=0x53

0xd=0x0

0xe=0x0

0xf=0x0

0x10=0x0

0x11=0x0

0x12=0x0

0x13=0x0

0x14=0x0

0x15=0x0

0x16=0x0

0x17=0x0

0x18=0x80

0x19=0x0

0x1a=0x0

0x1b=0x80

0x1c=0x35

0x1d=0x5

0x1e=0x0

0x1f=0x3

0x20=0xda

0x21=0xf3

0x22=0x1f

0x23=0xb8

0x24=0x80

0x25=0x85

0x26=0x0

0x27=0x0

0x28=0x0

0x29=0x1

0x2a=0x0

0x2b=0x0

0x2c=0x0

0x2d=0x0

0x2e=0x0

0x2f=0xce

0x30=0x80

0x31=0xf0

0x32=0x9e

0x33=0x43

0x34=0x0

0x35=0xca

0x36=0x3

0x37=0x0

0x38=0x0

0x39=0x40

0x3a=0x0

0x3b=0x0

0x3c=0xd0

0x3d=0x3

0x3e=0x18

 

Thanks,Shahar.

 

 

 

 

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