ADC3642: DDR Configuration

Tool/software:

Hello,

I try to configure the ADC3642 to work with the following configuration but I encounter some issues ...

- Output mode DDR
- Single ended clock
- 14bit data
- Sample rate 10MS/s
- SPI SCK : ~2.5MHz

Please find below the commands that I send to the chip through SPI:

1. Reg 0x000 - Value : 0x01
2. Wait for ~1.6ms
3. Reg 0x007 - Value : 0xA9
4. Reg 0x013 - Value : 0x01
5. Wait for ~1.6ms
6. Reg 0x013 - Value : 0x00
7. Reg 0x00A - Value : 0x23
8. Reg 0x00B - Value : 0x46
9. Reg 0x00C - Value : 0xF0
10. Reg 0x00E - Value : 0x09
11. Reg 0x011 - Value : 0x35
12. Reg 0x01B - Value : 0x90
13. Reg 0x01F - Value : 0x90
14. Reg 0x08F - Value : 0x02
15. Reg 0x092 - Value : 0x02
16. Reg 0x014 - Value : 0x10
17. Reg 0x015 - Value : 0x00
18. Reg 0x016 - Value : 0x00

NB: I have also tried to set the value 0x00 on register 0x000

I dont' have any clock in output on pin 25 (DCLK)  and I don't understand why.

Is there something wrong with my configuration ? 

I add below some pictures of the SPI signals I send.

Thanks in advance for your help and merry christmas !

Regards,

K. TOUTAIN