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Theory of Operation<br />
www.ti.com<br />
C CM (±ΔC) mismatch causes asymmetric e n attenuation, resulting in significant differential noise, which is also<br />
amplified by PGA gain along with sensor input.<br />
Figure 18. Common Mode Filter (Undesired)<br />
C CM (±ΔC) mismatch causes asymmetric e n attenuation. As long as CDIFF ≥ 10 CCM, differential noise is attentuated<br />
to an insignificant level.<br />
Figure 19. Common Mode and Differential Mode Filter (Desired)<br />
F<br />
F<br />
F<br />
DM<br />
DM<br />
DM<br />
1<br />
<br />
C68 C61<br />
2R47 R45C65 <br />
<br />
C68 C61<br />
<br />
<br />
1<br />
<br />
0.1 µF 0.1 µF <br />
2499 499 1 µF <br />
<br />
0.1 µF 0.1 µF <br />
152 Hz<br />
(5)<br />
18 Temperature Sensor Interface Module for Programmable Logic Controllers TIDU271–May 2014<br />
(PLC)<br />
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