AD9102 - Trouble with DDS mode and reading from SRAM??

Question

I have the AD9102 EVboard and I can get all modes to work: constant value, Sawtooth, DDS, and reading from SRAM. However, on my proto-layout board, I program the Ad9102 SPI directly and I can only get the constant value and Sawtooth mode to work. The DDS and read from SRAM do not give any output. I am taking the regval and default sequence from the EVboard software and and programming into AD9102 SPI directly. So inputting example4 settings gives me the pulsed triangle wave for the sawtooth mode which is working, but the sine wave of example6 is not working. The registers and SRAM are able to read and write properly. Is this a common problem or am I missing something obvious? Any help would be appreciated, thanks.

Biao.H · Accepted Answer

Hi Dan, 
 AD9120 power operation range can be from 1.8V to 3.3V. that's much more flexible, but you still may need to check if there has the big voltage drop or ripple/spur on each power rail. If you can send me the schematic, that will be helpful for understanding the issue deeply. You are using LDO or DC-DC regulator? 
 Also the RESET pin connection needs to be looked into carefully. making sure it's clean. 
 Example 1 or 2 configuration sequence is correct. RAMUPDATE can't reset all the registers to default values. 
 Read or write SRAM shall follow the configuration mentioned in datasheet. Also Start_ADDR/STOP_ADDR should be configured correctly. 
 To write to any SRAM address, set up the PAT_STATUS register (Register 0x1E) as follows: 
  BUF_READ = 0  
 MEM_ACCESS = 1  
 RUN = 0 
 To read data from any SRAM address, set up the PAT_STATUS as follows:  
 BUF_READ = 1  
 MEM_ACCESS = 1  
 RUN = 0 
 please make sure all the registers and SRAM can be written or read correctly.)

Biao.H · Answer

Hi Dan, 
 Can you try the example 1 sequence in the quick start guide? that uses SRAM data only to DAC. the results are shown below. 
 if it still cannot work with example 1 sequence, please check if all the registers are configured correctly. 
 if all the registers are written correctly, you may need to check the schematic to see all the connections are correct. 
 Power supply is also critical. making sure the power supply is clean enough. 
 
 the sequence as below. 
 0000h 0000h 
 0001h 0e00h 
 0002h 0000h 
 0003h 0000h 
 0004h 4000h 
 0005h 4000h 
 0006h 4000h 
 0007h 4000h 
 0008h 0000h 
 0009h 1f00h 
 000ah 1f00h 
 000bh 1f00h 
 000ch 1f00h 
 000dh 0000h 
 000eh 0000h 
 000fh 0000h 
 0010h 0000h 
 0011h 0000h 
 0012h 0000h 
 0013h 0000h 
 0014h 0000h 
 0015h 0000h 
 0016h 0000h 
 0017h 0000h 
 0018h 0000h 
 0019h 0000h 
 001ah 0000h 
 001bh 0000h 
 001ch 0000h 
 001dh 0000h 
 001eh 0000h 
 001fh 0000h 
 0020h 000Eh 
 0021h 000Eh 
 0022h 0000h 
 0023h 0000h 
 0024h 0000h 
 0025h 0000h 
 0026h 3030h 
 0027h 3030h 
 0028h 0111h 
 0029h ffffh 
 002ah 0101h 
 002bh 0101h 
 002ch 0003h 
 002dh 0000h 
 002eh 0000h 
 002fh 0000h 
 0030h 0000h 
 0031h 0000h 
 0032h 4000h 
 0033h 2000h 
 0034h 2000h 
 0035h 4000h 
 0036h 0001h 
 0037h 0200h 
 0038h 0000h 
 0039h 0000h 
 003ah 0000h 
 003bh 0000h 
 003ch 0000h 
 003dh 0000h 
 003eh 0000h 
 003fh 0000h 
 0040h 0000h 
 0041h 0000h 
 0042h 0000h 
 0043h 0000h 
 0044h 0000h 
 0045h 0000h 
 0046h 0000h 
 0047h 0000h 
 0048h 0000h 
 0049h 0000h 
 004ah 0000h 
 004bh 0000h 
 004ch 0000h 
 004dh 0000h 
 004eh 0000h 
 004fh 0000h 
 0050h 07d0h 
 0051h 0000h 
 0052h fff0h 
 0053h 0100h 
 0054h 03e8h 
 0055h 0000h 
 0056h fff0h 
 0057h 0100h 
 0058h 0bb8h 
 0059h 0000h 
 005ah fff0h 
 005bh 0100h 
 005ch 0fa0h 
 005dh 0000h 
 005eh fff0h 
 005fh 0100h 
 0060h 0000h 
 0061h 0000h 
 0062h 0000h 
 0063h 0000h 
 0064h 0000h 
 0065h 0000h 
 0066h 0000h 
 0067h 0000h 
 0068h 0000h 
 0069h 0000h 
 006ah 0000h 
 006bh 0000h 
 006ch 0000h 
 006dh 0000h 
 006eh 0000h 
 006fh 0000h 
 0070h 0000h 
 0071h 0000h 
 0072h 0000h 
 0073h 0000h 
 0074h 0000h 
 0075h 0000h 
 0076h 0000h 
 0077h 0000h 
 0078h 0000h 
 0079h 0000h 
 007ah 0000h 
 007bh 0000h 
 007ch 0000h 
 007dh 0000h 
 007eh 0000h 
 007fh 0000h 
 the SRAM data as below. 
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 2292 
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 1993 
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