Other Parts Discussed in Thread: DDC264
Hi.
I'm using DDC264EVM and I have some problems.
1.when I'm using Vin to connect a SiPD, I change the light of room or make it dark, but by clicking on fast data key in software, I get the plot changing very slow. for example from full scale, when I put it immediately in dark space, it receive to 0-5 % of full scale, but in a time about 10-20 seconds. every time I click fast data see the plot just changed about 5%. Although My SiPD have 20 MHz Freq. How can I see Immediate changes?
2. When I'm using Vin to connect a detector, and just connected one of jumpers on the Analog interface board containing resistors, for example,J10. when I get fast data on default settings in software, I see for example a 50 % of full scale on some channels that connected to the 1-2 input of J10 and other channels are not connected anywhere have a value near zero. but when we check other channels more, looking there is about 0-1 % of full scale on them as noise. it if we divide it to 100 it shows only 7/20 of bits are working accurate but not other 13 LSB bits? any other faced this problem? is my Evaluation board working good?
this is channels I see 80 % of FS:
and this is the noise on other channels zoomesd:
3. In test mode we disconnect Analog Interface Board and click fast data and see there where about 0.01 % noise that show there is about 13 bits have accurate value but 7 others not? is it normal? 7 bits noise in test mode? and why it has negative value?
this is what I see:
4. in ddc264 datasheet wrote max frequency for DCLK is 32 MHz but in the software the default value is 40 MHz?
5. I use this devise in free run mode, but when I see the CONV,DCLK & DOUT Pins on oscilloscope, CONV always works,but DOUT and DCLK just seen when I click fast data key? why this happens?
6. what do resistors series to vin do? is this for any safety reason or protection? I mean this resistors
Thanks
