P9235A-RB Layout Guide
© 2019 Integrated Device Technology, Inc
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March 19, 2019
Sensitive Circuits
The term “sensitive circuits” refers to noise-sensitive circuits that should be referenced to GND in the “quiet” ground area. AC coupling, the
thermistor bypass capacitors, and other capacitors are for decoupling noise. The resonance nodes generate the highest harmonic noise,
which must be filtered with decoupling capacitor. Place the current sense circuitry, the voltage demodulation circuitry, and the current
demodulation circuitry, in quiet ground areas away from the resonance nodes.
Figure 9. P9235A-RB Typical GND Noise Areas and Sensitive Circuit Placement
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13
12
11
sensitive
5:Isns,demod(C21,28,29,R28)
8:input current sense(R22,25,26,C37)
13:vsns demod(D2,R20,23,70,72,C18,19,20,69,70)
noise
11:tank resonant caps(C44,47,48,49)
12:coil(L5)
5
