Doubt about gain setting...
PGA281 datasheet, page 15, figure 38:
- INN = 0
- INP = 8 [Volt peak-peak]
So IN (differential) = INP-INN => 8 [Volt peak-peak]
- Gain = 1/8 = x0.25
VOUT = IN*0.25 = 8 [Vpeak-peak] * 0.25 = 2 [Vpeak-peak] (instead 4 reported on graph)
VOUTP peak-peak = VOUTN peak-peak = 0.5 * VOUT peak-peak = 1 [V peak-peak] (instead 2 reported on graph)
Has wrong gain set on graph schematic?
I expect:
Vout_diff = VOUTP - VOUTN = VIN_diff x Gain = (INP - INN) x Gain
I try ltspice simulation with parameters above:
but I get different results: VOP = VON = 1Vpp, VO = 2Vpp
So, wrong datasheet example, wrong circuit or wrong spice model?
Thanks.
