This is David from CAST Beijing. I have a quesiton about AD9835.
How to synchronize two AD9835s? I checked AN-587, but It's for AD9850/1 which have FQ_UD pin.For AD9835, it haven't FQ_UD, then how to synchronize two AD9835s?
As a first thought, the digital levels of AD9835 and the crystal are not compatible,
May you replace your crystal for a CMOS compatible? Or decrease your AD9835 supply to 3.3V and escalate appropriately the other digital…
Corrected mistake. The AD9835 evaluation board was obsoleted a few years back. In it's place, the AD9832 evaluation board is recommended, but the AD9832 is limited to a max MCLK of 25MHz whereas the AD9835 can use a max MCLK of 50MHz.
My AD9835 outputs 0V.
After power the AD9835, there is no 1.21V reference if I send a word 0xD000, the refout pin is still 0V reference.
But, if I don't power the AD9835, I sent a word 0xD000 directly then the 1.21V reference can…
Actually found that AD9835 may be useful but I'm not that sure...
The AD9835 is substantially more power hungry. It's not an option for my application.
I am able to successfully program the part, but achieving this stage was problematic because of inconsistencies and contradictions in the documentation which I had to work around. I refer to DATA SHEET ( 41503.pdf ), and APPLICATION NOTE AN-612.
I am planning to user FPGA GPIO to control data loading, Does it require SPI or Can I directly interface?
I'am using an AD9835 to generate a sine wave of 875kHz. The Clock of the DDS is 50MHz. This signal is amplified and travels through a sensor and is rectified and the resulting signal is filtered with a lowpass filter -3dB@10Hz, DC is subtracted and…
We looking at using the AD9835 DDS chip.
We need to generate a sine wave say at 300Hz but also need to superimpose two or more frequencies (say of about 3kHz, 4kHz etc) onto the 300Hz so that the resulting output contains sums and difference…