hello team,
I want to generate square waveform from 10khz to 10mhz continuously using dac ad9106 SRAM with stm32h745.. now got output for 50khz to 20Mhz but also want to minimum frequency upto 1khz, 5khz and 10khz. suggest any register value changes or any SPI frequency changes... how can i achieve minimum frequency.
Hi Dipakpatil ,
The vectors can be generated in any way, ACE Vector Generator or DPG Lite are just example softwares that ADI has to generate the vectors. If you are using ACE Vector Generator Tool, the capture below is what the UI would look like and you can play around with the values to generate the desired waveform.
Below is the square waveform with 1MHz DAC frequency and 1kHz output frequency. The resolution is changed to 12 (for 12-bit DAC), and record length is set to 3000 for a 3-cycle square waveform. Unsigned Data is unchecked for two's complement data format.
To generate a continuous waveform without delays between each pulse, the pattern period set in Register 0x29 must be equal to the length of the waveform in the SRAM.
Regards,
Marco
hello JMMina ,
I want to generate different types of waveoform like staircase, trapezoidal, arbitrary waveforms. so i put samples in range -2047 to 2048 for amplitude. i acheive this but i want to again more duration of waveform like 1ms, 2ms etc. means slow frequency waveform..
above waveform genarated using store samples in DAC AD9106 SRAM. so how can i achieve more waveform duration?
with whole stored 4095 samples in sram acquire 420uS period for single waveform.
Is it possible to generate long time/ Slow frequency waveform using AD9106 Sram?
Hi JMMina
I put value in Time control register 0x28=0x0000, and Pattern period register 0x29=0x1FFF, so using that i acquire window upto 50ns to 430us.
So what value i need to put for access full window.
In ACE software what is meaning of this
if i put this value greater than 420uS then it showing error 
Hi Dipakpatil ,
The formula for the pattern period of a waveform is below. This information is already added to the list being added to the datasheet and the datasheet is currently being revised.
The register you are changing is the Pattern period register (0x29) which is only one part of the actual pattern period. You can increase the value of that register in ACE Memory Map to its maximum (0xFFFF). You did the correct thing with setting PAT_TIMEBASE (Register 0x28) to 0x0000 - this sets the value of PAT_PERIOD_BASE to 16 DAC clock periods per PATTERN_PERIOD LSB.
If you have say 10 MHz of DAC clock frequency and have set PAT_PERIOD and PAT_PERIOD_BASE to their maximum, you will get a pattern period of 104.86 ms for the waveform (from the formula above). If you require a longer pattern period, the only thing to do is to decrease the DAC clock frequency.
Best regards,
Marco
hello JMMina
I'm trying with changing value in PAT_TIMEBASE(0x28=0xffff) Reg and PAT_PERIOD(0x29=0xffff)reg that time period in increase upto 6.5ms but waveform using 4095 samples in sram got same only upto 420uS 
and if PAT_TIMEBASE(0x28=0x0000) Reg and PAT_PERIOD(0x29=0x1fff)reg that time period upto 870us but waveform using 4095 samples in sram got same only upto 420uS
and if PAT_TIMEBASE(0x28=0x0000) Reg and PAT_PERIOD(0x29=0x0fff)reg that time period upto 112ms but waveform using 4095 samples in sram got same only upto 420uS
can you please suggest exact value to store both register? or any calculation of both. I used DAC external oscillator of 150mhz.
I want to increase window of pulse
i select below register with values. and sample store in SRAM(-2047 to 2048 and store with 2s compli)
uint16_t reg_addr[]= {0x0000,0x0001,0x0002,0x0003,0x0004,0x0005,0x0006,0x0007,0x0008,0x0009,0x000A,0x000B,0x000C,0x000D,0x000E,0x001F,0x0020,0x0022,0x0023,0x0024,0x0025,0x0026,0x0027,0x0028,0x0029,0x002A,0x002B,0x002C,0x002D,0x002E,0x002F,0x0030,0x0031,0x0032,0x0033,0x0034,0x0035,0x0036,0x0037,0x003E,0x003F,0x0040,0x0041,0x0042,0x0043,0x0044,0x0045,0x0046,0x0047,0x0050,0x0051,0x0052,0x0053,0x0054,0x0055,0x0056,0x0057,0x0058,0x0059,0x005A,0x005B,0x005C,0x005D,0x005E,0x005F,0x0060,0x001E,0x001D};
uint16_t sramsquare_regval[]={0x0000,0x0e00,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x1f00,0x1f00,0x1f00,0x1f00,0x0000,0x4000,0x0000,0x000e,0x0000,0x0000,0x0000,0x0000,0x3030,0x3030,0x0000,0x1fff,0x0101,0x0101,0x0003,0x0000,0x8003,vset_hex,0x8003,0x8003,0x4000,0x4000,0x4000,0x4000,0x0001,0x0200,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x07d0,0x0000,0xFFF0,0x0000,0x0FFF,0x0000,0xFFF0,0x0000,0x0bb8,0x0000,0xFFF0,0x0000,0x0fa0,0x0000,0xFFF0,0x0000,0x0000,0x0001,0x0001};
