Dear John,
I have simulated LMP91000 following the macro instructions you provided.
The range of currents I need to measure is:
-300 nA < Iwe < 300 nA
Using the "DC transfer characteristic" analysis at TINA-TI, I get the following curve:
I am attaching the TINA file, (Please visit the site to view this file)
The registers are configured as follows:
TIACN:
TIA_GAIN = 350k
RLOAD = 100
REFCN:
REF_SOURCE = external = 1
INT_Z = 20% = 00
BIAS_SIGN = negative = 0
BIAS = 8% = 0101
MODECN
FET_SHORT = disabled = 0
OP_MODE = 3-lead amperometric cell = 011
I wonder if the DC transfer Characteristic Curve is OK.
Thank you !!!
Best regards,
Alejandro