How is the "Null adjustment" method as it mentioned in ADXRS623 datasheet that include injecting current to SUMJ?
The SUMJ node has the rate output as a current signal, which is converted to voltage by the total output resistance Rout. To adjust the offset voltage by X volts, a current = X/Rout has to be injected in to SUMJ.
Can you give me an example please?
i need to increase RATE OUT NULL from 2.488 to 2.553.
Can you write the calculation ?
I just used 2.6k resistor between SUMJ and Rate Out to fixe this Voltage. but it doesn't response matching with Scale Factor(12.5mv per deg/sec). i think maybe i just reduced the BW too much.
thanks a lot
To change Null from 2.488V to 2.553V i.e. increase it by 65mV, you have to draw out 65mV/180kOhm = 0.36uA of current from SUMJ.
That was very useful.
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