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Recent content by LONGGANG

  1. L

    The ADC analog input issue

    Hi Klaus, Thanks for replying. Your comments helped me a lot! I tested today and got some results in accordance with your inference. Frist the oscilloscope I used only has 20mv minimum detecting gap. And when the input voltage is low (100mv), the waveform displaying on the screen will have...
  2. L

    The ADC analog input issue

    Hi stenzer, Thanks for replying. I used both a 1.6 V battery and a signal generator to create DC inputs. They showed the same results. And I checked the FPGA three GPIOs by the ILA. There is no data lost during ADC and FPGA communication with 1 MHZ tsck (The first row is CS. The second row is...
  3. L

    The ADC analog input issue

    Hi, Thanks for replying. The signal generator connected to the ADC GND directly in my test. BR, LONGGANG
  4. L

    The ADC analog input issue

    Hi, Thanks for the good suggestions!! I will do a PCB design for it following recommendations carefully and test it further. Once I got some results, I will post them here. BR, LONGGANG
  5. L

    The ADC analog input issue

    Hi, Thanks for replying. The ADC right now is not built in a PCB but a breadboard for fast testing like that: This circuit followed the bypassing recommendations in the datasheet. For the ground traces, I thought this will not affect DC voltage inputs. The references are measured by both a...
  6. L

    The ADC analog input issue

    Hi, I used a signal generator with 50ohm output impedance connecting with A_in. And for A_in I used both a multimeter and an ocliliscope to read the DC input value as references. A_in input impedance is around 1.3Mohm measured by a multimeter. BR, LONGGANG
  7. L

    The ADC analog input issue

    Hi, I am new to the ADC application. I am using the ADC LTC2314-14 for testing DC inputs and AC inputs. The outside circuit is shown in the figure. For the SPI protocol, there are no issues inside the communication. The FPGA can read the correct SDO from the ADC, the SCK is 1MHZ which is also...
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