• AD7998

    AD7998 datasheet says that the voltage range for external reference can be any between 1.2 and VDD. I acquired an eval-ad7998 board and rewired one of the digital potentiometer to work as the external reference voltage at 1.0 vcc (my magic number). The…

  • AD7998: Unused control pin

    I do not intend to use AD7998 pin 16 (CONVST) for control.
    Do I tie this pin high-low or leave floating.
    Intend to use Mode 2 only for conversions.


    The CONVST pin should be tied low for all other modes of operation.
    I do not intend…
  • AD7998 instable conversion results


    I am testing the AD7998 on several identical boards. I get 50 samples each second and provide the average of these conversion data.

    VREF is provided by REF195. The input data are buffered and filtered and perfectly stable (measured with a precision…

  • Typographical error in AD7998 data sheet?


    I have read the AD7998 data sheet.
    "Figure 29 writing a 2-byte read operation from the conversion result register."

    Datasheet AD7997/AD7998 (Rev. 0 | Page 29 of 32)

    However, I think that the figure showing the "2-byte read operation" is not…

  • BF518 TWI (AD7998) issue (sequence mode)

    Hi to all.

    I have some issue with AD7998 ADC.

    AD7998 adc supports several modes and use twi for data transfering.

    When i use single conversion mode (conversion by command) all works fine.

    When i use sequence mode (conversion all channels one by one…

  • AD7998 channel-channel interference in Mode 2

    I'm debugging a board which uses the AD7998 12-bit multiplexed ADC converter and appears to have channel-channel interference. There appears to be an issue with around 40% of the boards to a lesser degree.

    The ADC device is used in MODE2 where 6 channels…

  • RE: How to use AD7998 with BeagleBone

    Hi Tigerclaw,

         I am assuming that you are developing a software for the AD7998 to monitor battery value on Vin1. I can refer you to the AD799x family wiki page. You can find here a software driver, design for the AD799x family which can be use as your…

  • AD7998 problems with reading sequence of channels in mode 2


    I built a small data acquisition system around the 8 channel I2C ADC AD7998.

    In my application I need to read a sequence of selected channels in an efficient way. Therefore I chose the "sequence of channels" capability in mode 2 (command mode…

  • RE: Method to address 32 or more ADCs on the same SPI bus?

    Hi, Mike.

    Would the customer need 32 individual ADCs or can he make use of multichannel ADCs? We have the AD7997/AD7998, ADCs with 8-channels and have an I2C compatible interface. These parts have 2 versions and by giving different addresses for the…

  • AD7994 filter

    The AD7992 AD7993 AD7994 AD7997 AD7998 have a bit D3 in the Configuration Register defined as FLTR, with a vague description that this filters the I2C bus.  What filtering does this bit enable? Where is this documented?