AD9957: maximum signal bandwidth

Question In AD9957's datasheet, as figure 1 shown, the AD9957 output signal's bandwidth is about 10MHz. I want to know what the maximum signal bandwidth of AD9957 can process is. Answer The maximum signal bandwidth is ~62MHz. Given a 1GHz system clock, the AD9957's maximum vector(IQ) rate is 125MSPS. Note, we recommend that the user up sample their baseband signal by a minimum 2x. This is to avoid excessive roll-off of the 1st half band's frequency response. I have seen applications around 56MHz.

AD9956: Run-time error 13

Question I have a following problem with AD9956 evaluation board software. When the program successfully connects to the board on USB, I'm getting an error message : Run-time error '13' Type mismatch This error occurs both on Windows XP 32-bit SP3 and Windows 7 32-bit SP1. Answer The AD9956 software as stated on our website will only run on Windows 98, Windows 2000 or XP. It is currently not tested for Windows 7 though some customers have sucessfully run it on Win 7. The most common cause of "Run-time Error 13" to do with Windows and certain conventions used in the US as opposed to Europe. One problem is the use of decimal points (US) in place of commas (used in Germany and some other parts of Europe). It is possible that you have your computer set to recognize commas and decimal points differently than the AD9956 program. It is an inability of the AD9956 eval program to recognize different Regional Setting that are offered by Windows. In order for the AD9956 program to function as intended, the user must first go to his computer Windows "CONTROL PANEL" and then select "REGIONAL SETTINGS". Change the settings to read "ENGLISH (UNITED STATES)". (Also the user will need to use decimal points instead of commas when specifying frequency).

AD9957AD9910_Matched Latency Enable Bit

Question I am using AD9957, the reference clock is 48MHz, the system clock is 960MHz, output 60MHz signal(Single Tone Mode), and met a problem. 1. When he configured "Matched Latency Enable " Bit as 1, after power on, the 9957's output isn't stable. Sometimes there is only 60MHz signal(0dBm), sometimes there are 60MHz,120MHz and 240MHz harmonic frequency, sometimes the output is 240MHz(forth of 960MHz); 2. When he configured "Matched Latency Enable " Bit as 0, the output is always correct. Whether the "Matched Latency Enable " will influence the output? He also want to more descriptions about "Matched Latency Enable "? Answer The AD9957 and AD9910 are the same die. Bond wires separate the products functions. The match latency feature works on the AD9910. A little about Match latency…...If a user wants to change two or more parameters (frequency,phase,amplitude) at the same time and also wants that change coincident at the DDS output, you must set the match latency bit to logic 1. Otherwise, changes in the parameters will not be coincident. Apparently, the AD9957 does not support the match latency feature.. The match latency bit should always be set to logic 0.

64 bit Windows compatibility

Question There is an issue when trying to connect AD9957 evaluation board : USB port is not recognized by Windows 7 64 bits. Do you confirm? Is is possible to get updated driver? (USB chip on the AD9957 eval board is CYPRESS CY7C68013_128). ADI command soft is correctly installed on his computer but eval board is not detected because of the USB driver issue. The eval board is power supplied via TB1 and TB2. Answer The evaluation software for AD9957 does not yet support 64 bit versions of Windows 7. It will be updated for 64 bit machines in the coming months. A workaround would be to use virtual XP or virtual PC mode for 64 bit Windows 7 machines. How-to use virtual XP or virtual PC mode is covered in a FAQ on Engineer Zone. Kindly find the link below. https://ez.analog.com/docs/DOC-2940 Another option would be to switch to a 32 bit Windows system.

Can the AD9957 Evalboard and software generate CDMA modulation of the AD99957?

Question Can the AD9957 Evalboard and software generate CDMA modulation of the AD99957? Answer In general, the AD9957 can produce any modulated signal that relies on a complex baseband component (I + jQ). The AD9957 evaluation software only supports the generation of a limited set of complex baseband formats such as QAM, GMSK, etc. In most cases, one would drive the AD9957 data port with an FPGA containing the necessary hardware to generate the desired digital complex baseband signal. As long as CDMA satisfies the condition of being a complex baseband signal, then the AD9957 will be able to produce a CDMA output signal.

Question If we configure the 21st bit of CFR1 to 0, then the CCI_OVFL Pin was always high; If we configure the bit as 1, then the CCI won't overflow. In normal operation, should this bit be configured as 1? Answer If a CCI overflows exists, it could be due to.... 1) A profile pin change while TxEnable is high. Don't let profile pins float. 2) Excessive jitter on the REF CLK. The CCI clear bit can be set to clear a CCI overflow. Typically, this bit is set to logic 0. If this bit is set to logic 1 to clear a CCI overflow, it will automatically go back to logic 0 and the user must set to logic 1 again if needed.