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…
Hello,
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…
Hi
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…
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…
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…
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…
Hello
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…
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…
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?