Part Number: TDC1000-TDC7200EVM
Hello,
I use TDC1000-TDC7200EVM with transducer ( Fc=300Khz – capacitance=1200pF – min resistance parrallel=150Ω) and it doesn’t work well, the goal is to use it to measure distance in the air.
Note: (it work well with SMD15T21R111WL to measure in liquid).
I know that it’s necessary to change the value of some components:
I let R31= 5.36k & R34= 1k
But I changed (after read of 8.3.5 Receiver Filters & inspired by TDC1000-GASEVM):
C27=510pf
C32=400pF
C36=3000pF
C42=R=0.9K
Please see attached:
1°) GUI, I use CPU clock => 1.2Mhz & LNA Resistive FB,
2°) Screenshoot obtained with C42=R=0.9K (without STOP SIGNAL)
3 & 4°) Screenshoot obtained with C42=R=0 (the STOP signal change while transducer distance doesn't change).
Can you help me to understand what I need to change to have a correct signal ?
Thanks in advance,
Best regards,
Belkacem