We configure a DAC5682 in self test mode following these
1) CLKIN/CLKINC it is stable 62MHz with common mode voltage at 0.9V which is CLKVDD/2
2) RESETB toggles low for 2ms.
3) Registers programmed and the read back values are:
Reg: 0x0 Value:0x3
Reg: 0x1 Value:0x18
Reg: 0x2 Value:0xea
Reg: 0x3 Value:0xb0
Reg: 0x4 Value:0x0
Reg: 0x5 Value:0x6
Reg: 0x6 Value:0xf
Reg: 0x7 Value:0xff
Reg: 0x8 Value:0x0
Reg: 0x9 Value:0x0
Reg: 0xa Value:0x0
Reg: 0xb Value:0x0
Reg: 0xc Value:0xa
Reg: 0xd Value:0x55
Reg: 0xe Value:0xa
Reg: 0xf Value:0xaa
4) SYNCP/N is set to high
On the output we see a constant voltage around 3V (no ramp voltage like a self test should produce).
What could be the issue? We run out of ideas and really need help with this.
Thanks,
Valentin