I am using the AD9694 and I have problem with the A/D convertion that does not start.
The input clok is 500 MHz and the analog input signal is 10MHz 800mVpp (AC coupled).
If I set the A/D in test mode forcing a ramp generation (writing the register 0x0550 0x0f) all is working correctly.
Which could be the cause that put the A/D not converting (all 4 channels) ?
Following my startup initialization:
0x12 0x28 0x4F0x12 0x28 0x0F0x12 0x22 0x040x12 0x22 0x000x12 0x62 0x080x12 0x62 0x00
0x00 0x02 0x11
# quick configuration (Lines = 2, Converters (M) = 2, Octets x frame (F) = 2) b"01-001-001"0x05 0x70 0x49
# N', N, CS0x05 0x8F 0x0F0x05 0x90 0x2F
0x05 0x8B 0x00
0x01 0x1c 0x0A
#set line rate 5GBps
0x05 0x6E 0x10
# Normal Mode0x00 0x02 0x00
Someone can help me how and what I have to investigate ?
What are you seeing at the output of the AD9694 when the "the conversion does not start"?
many thanks for your help.
Below it is reported an acquisition on RX side when the conversion does not start, in particular on my bench I have channel A input a sine wave (14 MHz, 800 mVpp), channel B open, channel C open, channel D open.
rx_rxdata are inconsistents and rxcharisk always recognize a K char (rx_sync always set to 1).
If I set the A/D in test mode to generate a ramp (0x0550 0x0f) I obtain the following result (all seem working properly):
rx_rxdata are consistents (ramp) and rxcharisk always set to 0.
Considering the first figure it seems that the analog input is not acquired, both when the signal is applied or left open.
Which could be the cause ? What should be investigated ?