My customer wants to ask you about the following questions related to "Full Bandwidth Mode" in AD9694. Could you please reply to the following questions?
[Customer's AD9694 usage]:
1) Sampling rate: 250[Msps].
2) ADC channels: 4 channel used.
3) All DDCs: Disabled.
4) ADC bandwidth: DC to 125[MHz].
5) Analog signal bandwidth: The 2nd Nyquist frequency at 125[MHz] to 250[MHz] for RF IF signal.
Q1: When Bit[3:0] in Register 0x0200 is set to "0000"(b) as "Full bandwidth mode" in AD9694, can 4ch ADC sections in AD9694, correctly and individually, work with 250[Msps] for 0 to 125[MHz] as full bandwidth mode?
Let me show you the following reason why my customer asked you about the above question:
* p.57 of AD9694:
- Two 14-bit converters at 500MSPS.
Q2: There is "NSR (21% OR 28% BANDWIDTH)" in "Figure 92 Full Bandwidth Mode" on p.57 of AD9694 datasheet.
What is "NSR"? "NSR" is "Noise Shaping Re-quantization", isn't it?
Q3: Moreover, please advise my customer about the meaning of "21% OR 28% BANDWIDTH" in the above NSR block of AD9694..
My customer is worried that the NSR might make more bandwidth limitations for "0 to 125[MHz]" with 250[Msps] even in Full bandwidth mode of AD9694.
Thanks and regards.