• PGA for AD7768-1


    I have to measure +/-10V single ended signals up to 200kHz with the AD7768-1 (24bit resolution, 512ksps).

    Now, my customer asks for a PGA with gain = 1, 2 and 4.

    Which signal conditoning solution do you suggest that maintains the noise and distortion…

  • AD7768-1 问题



  • Using a single Reference with multiple AD7768-1


    I have a design that will use up to 16 (sixteen) AD7768-1 delta-sigma ADC.

    Due to limited PCB area, I would like to use a single reference for all AD7768-1.

    According to the AD7768-1 data sheet, the AD7768-1 has fully buffered reference inputs…

  • AD7768-1 strange DOUT behavior

    We are doing a data acquisition system based on the AD7768-1 and I’m seeing some strange behavior of the DOUT (MISO) line, that ultimately results an incorrect data acquisition.

    In some cases the DOUT line resets too early, leaving a really small…

  • AD7768-1 analog input overvoltage protection?


    - does the AD7768-1 have internal ov-protection diodes between the AINs and AVDD1?
    - what is the maximum rating on the current handling of these diodes?

    - I want to have AVDD1 = UREF = 5V. Is this allowed? Does this degrade performance somewhat…

  • RE: AD7768-1 Raw modulator output for FPGA post-processing


    there is mod output mode on the AD7768-1, but note that its only available in low power mode. Note that we have minimum tests on this feature

    Pseudo Algorithm would be 

    ►Configure the part via SPI as desired

    ►Put part into Modulator output mode, using…

  • SNR of AD7768-1 with AD8250 at 48 kHz input frequency


    my customer asks for the SNR that is to be expected with the following signal chain:

    48 kHz input-signal ---> AD8250 ---> LTC6363 ----> AD7768-1

    AD8250 is powered by +/-15 Volt.
    The LTC6363 translates the up to +/-10V output from the AD8250…

  • EVAL-AD7768-1 external power


    What are the power requirements on the J6 connector (pin voltages) to power the EVAL-AD7768-1 when the VINSEL jumper is set to A (i.e. power input from Connector P6)?  Does both J6 and J5 require the various power rails to have the EVAL-AD7768-1 fully…

  • How to measure a single-ended +/-10V signal with the AD7768-1?


    I have a DC-coupled +/-10V single-ended signal (max. 200kHz) from a high impedance source that I want to measure with the AD7768-1.

    Now I wonder about two things:

    (1) which will be the best OP-Amp solution to down-scale the single-ended +/-10V…