Other Parts Discussed in Thread: REF6045, REF6025
For the uA solution of ADS1260:
If I choose bigger value R-shunt = 500mΩ for much buffer of avoiding noise,
(1) Vshunt_Max = Isense_Max x Rshunt = 50mA x 500mΩ = 25mV
(2) Dynamic Range = Isense_Max / Iresolution = 50mA / 1uA = 50000
-> (3)Vresolution = Vsense_Max / Dynamic Range = 0.5uV
I can choose PGA Gain =128 for best performance.
Q1: If the current flow direction is only one-way.
For more VIN_DIFF Range and lower Dropout voltage,
is 4.5 V(REF6045) better for Reference voltage instead of 2.5V(REF6025)?
(2) In ADS1260 Datasheet, I get confused in the Table 4:
What is the correct value of Full-scale Diff. input range when Gain =64, 128?
The value in Table 4 is mismatch to the formula rule “gain = 32,64 , use gain = 32 in the calculation”.