AD9837

I programmed the AD9837 DDS with the following commands
   0x2100;
   0x4000;
   0x7FFF;
   0xC000;
   0x2000;
Why does the sinusoid generated have a frequency of about 975Hz?
I have checked the FSYNC, SCLK and DATA line is correct.

MCLK = 16MHz



MCLK=16MHz
[edited by: flsp at 3:37 PM (GMT -4) on 29 Sep 2020]