The device's data sheet just says that due to the low noise input amplifier, it can tolerate significant impedance bridge resistances. Can anybody put a figure on this? We generally fit 350 or 700 Ohm bridges but would like to change to 2K.
We list the input current specification rather than specify the input impedance. The input impedance can be calculated from this input current specification. For AD7797, the average input current is +/-250pA max. Therefore, the impedance is several hundred megaohms. However, make sure that the output voltage of your sensors will not exceed the allowable input voltage limits to avoid any linearity issues. These values can be found on the datasheet specification section.
hi SimonM, i saw you use AD7797, i need some help if you can do it, what microcontroler you use now? i work with PIC, but still cant receive results in SPI, i think my code are wrong, if you can help me with some example code to init and registers...
Sorry, I am using a BLE module which uses a scripting language, and the code (which is not C or ASM) would be difficult to understand because it is using module-specific sleep modes and interrupts, and that part of the code is condfidential. I did do a quick search to see if I could point you in the direction of other example code, but notice that others have already done this for you last year.
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