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After i check the spec, find that there are two packages with different pin assignment for TSH300.
So, would u use the SOT23-5 or SO8 ?
It is only correct by using SOT23-5 in ur circuit diagram.
Can You Help Me?
if the input of U1 is assigned as V1 and another input of U2 is V2, the final output would become (V2-V1)X[1+(R1+R3)/R2]X(R6/R4) which is under R6=R7 & R4=R5.
So that, for ur question the first gain is (V2-V1)X[1+(R1+R3)/R2] .
For ur reason, i think maybe the result 70db of SFDR at 1 point/ 1 step is correct. When u test with 256 points with one step, the output freq would be lower 256times as original 1 step/1 point. So that u should change this freq value to 256 times lower in yr fft cal program, then the result...
OP-Amp issues...
In my think, the cause reason for your problem 0V input then get around 3V output. It's u connect 1k ohm resistor to -5V not 0V.
741 is amp dual supply opamp op at +5V and -5V.
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