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.
Your inquiry has been forwarded to the AD9694 support team for review. Please note that some of our support staff are taking extra vacation this time of year to accommodate travel during the holiday season so response time may be slightly delayed.
Q1: Correct. All four converters work at the designated sample rate in full bandwidth mode.
Q2: NSR is not supported in the AD9694. I apologize for the confusion. I will update the figure.
Q3: See answer of Q2.
Thank you so much for your kind and helpful replies.
Your replies would be so much appreciated by my customer.