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Found 3 results

  1. Hello, I am using ZMOD DAC with Eclypse Z-7 board, and I have two questions regarding controlling ZMOD DAC 1411 output voltage: 1) How do I switch between the low gain and high gain setting in ZMOD AWG (ZMOD DAC 1411) to shift between +/-1.25V and +/- 5V setting using the ZMOD DAC LLC IP in Vivado? 2) I want to control the output voltage levels of the DAC. How do I change the signed 14-bit values in my Verilog module to achieve the desired output voltage? The reference manual shows the following equation for controlling the 14 bit value: So for example, if I want to have voltages between 0 and 3 V, how do I set CA, CG and Range (which is again related to High/Low gain value from Q1 above) values using LLC IP in Vivado? How do I interpret Vout in this case? The LLC IP shows as follows: Please provide me with some help in this regard. Currently, I am giving between 14'd0 and 14'b01111111111111 and I am only seeing between 0-670 mV on oscilloscope with trigger setting of 50 ohm DC (and ~0-1.3 V with trigger setting of 1 M ohm DC). Please let me know if you need more information from me. Thank you, Nasir
  2. Any help will be greatly appreciated. My goal is to receive a trigger on a Analog-In Channel to be followed by a Generated Signal on an Analog Out Channel after a specified time, and this needs to be repeated numerous times. How accurate can this specified time and how consistent can it be? Are there any built in functions that can get this accomplished. I have seen many references to the defined Wait functionality, which can accomplish this expected behavior, however the wait time varies and there is an approximate ~17ms delay. Thanks for your help.
  3. Hello. I have been using the Analog Discovery 1 (legacy version) as a portable oscilloscope and function generator. I am using the Wavegen as a function generator to test an analog front end (AFE) which includes an integrated instrumentation amplifier and an ADC (http://www.ti.com/tool/ADS1293EVM). Trying to characterise the performance of the AFE, I used the Analog Discovery's function generator to generate sine waves of different amplitudes (between 1mV and 100 mV pk-pk) and frequencies (between 40 and 200 Hz, in steps of 40 Hz). The gain of the instrumentation amplifier is fixed at 3.5 and the bandwidth of the AFE is programmable (ranging between 170 Hz and 340 Hz). I find that the gain of the system varies with frequency and is either 1 or slightly higher/lower than 1, depending on input voltage and frequency. I did not include any load resistance in my measurement circuit since the internal impedance of the voltage generator was 0 (as mentioned in https://forum.digilentinc.com/topic/3203-analog-discovery-2-waveform-output-impedance/ and https://forum.digilentinc.com/topic/18292-impedance-for-analog-discover-2-itself/#comment-47859). I would like to know if it would be necessary to include any load resistance while using the AWG as input to an instrumentation amplifier. If this is not the reason, what could be the reason for this mismatch in gain/amplification factor? I have posted a query in the TI forum (link: https://e2e.ti.com/support/data-converters/f/73/t/898470). I have also attached the WaveForms workspace file I used. Thanks in advance for helping out with this. Best regards, Ganesh Load-resistance-test-2020-05-27.dwf3work