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DC1762 demo board settings

Hi. I have a question about setting of dc1762.

I want to send a sine wave to the dc1762 from the power supply and then to the PC via the dc890b(FPGA board).

But I have a problem that ENOB can not raise to 16.

 

My settings are below

power supply: 5V

Signal generator

CH1 for analog input: 9MHz sine wave, amplitude: 1.5Vpp, 0V offset

CH2 for clock : 100MHz Square wave (3V high, 0V min, single-ended)

DC1762 board

Parallel/serial :serial

Duty cycle stabilizer: disable

SHDN: disable

NAP: disable

LVDS/CMOS: disable

After checking the results on PC with pscope, it was like the picture below.

ENOB is 1.56bits

 

I would really appreciate it if you could help.

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  • It looks like the jumper settings aren't correct.  In serial mode the jumpers should be like this:  

    JP2 PAR/SER: Selects parallel or serial programming mode. (default: serial)

    JP3 Duty Cycle Stabilizer: enables/disables duty cycle stabilizer. (default: enable)

    JP4 SHDN: Enables and disables the LTC2165. (default: enable)

    JP5 NAP: Enables and disables NAP mode. (default: enable)

    JP6 LVDS/CMOS: Selects between LVDS and CMOS output signaling. (default: LVDS)

    This is to ensure the serial signals are not shorted to GND.  

    It also looks like you are in the manual configuration mode in PScope.  Pscope will detect and configure itself, so put it back into the auto mode.  

    Let me know what it looks like after you make those changes. 

    -Clarence

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  • It looks like the jumper settings aren't correct.  In serial mode the jumpers should be like this:  

    JP2 PAR/SER: Selects parallel or serial programming mode. (default: serial)

    JP3 Duty Cycle Stabilizer: enables/disables duty cycle stabilizer. (default: enable)

    JP4 SHDN: Enables and disables the LTC2165. (default: enable)

    JP5 NAP: Enables and disables NAP mode. (default: enable)

    JP6 LVDS/CMOS: Selects between LVDS and CMOS output signaling. (default: LVDS)

    This is to ensure the serial signals are not shorted to GND.  

    It also looks like you are in the manual configuration mode in PScope.  Pscope will detect and configure itself, so put it back into the auto mode.  

    Let me know what it looks like after you make those changes. 

    -Clarence

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