Is it possible to generate a square wave form using the AD9102?

Question

Is it possible to generate a square wave using the AD9102? I have successfully interfaced the AD9102 IC with a controller and managed to generate a DDS sine wave. However, for my current application, I require a square wave instead. If generating a square wave is feasible, could you please provide me with the necessary steps and register values to achieve this? Additionally, I would like to understand the required input clock frequency for waveform generation. Thank you.

JMMina · Accepted Answer

Hi Shivbhawan , 
 Since square wave is not one of the prestored waveform selections in AD9102, it will have to be generated externally. You can do a modular approach where you generate a sine wave in the AD9102 from DDS, and then convert that sine wave to a square wave externally through a comparator. Here's an example: Using the LT1719 Comparator for Low Dispersion Sine Wave to Square Wave Conversion 
 If using just the AD9102, the internal SRAM will have to be used since square wave isn't a prestored waveform selection in the DAC. Note that AD9102 has up to 4096 SRAM Addresses (0x6000 to 0x6FFF) so more complex waveforms can also be stored to the DAC. 
 For further clarifications with AD9102/AD9106, kindly post in the High Speed DACs forum. 
 Best Regards, 
 Marco)

JMMina · Answer

Hi raviboi , 
 No, the DDS tuning word is a different block from the SRAM. The vector will need to be written directly to the SRAM. It may be time consuming to create the vector from scratch depending on your requirements (frequency, amplitude, etc.). It would be more convenient to use a vector generation tool such as DPG Lite or ACE Vector Generation [Analog Devices Wiki] . 
 Regards, 
 Marco

JMMina · Answer

Hi Shivbhawan , 
 Yes, it's possible. Please see related query here: DAC9106 Square generation and sawtooth frequncy . AD9106 is the 12-bit, 4-channel output DAC while AD9102 is the 14-bit, single-channel output DAC. For the input clock frequency, the maximum input clock is 180 MSPS, you can use any frequency within this range. 
 Regards, 
 Marco

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Is it possible to generate a square wave form using the AD9102?

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