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BQ50002A: Demodulator input signal conditioning

Robert Grimmer
Prodigy 30 points
Part Number: BQ50002A
Other Parts Discussed in Thread: BQ500511A,

I'm currently using the BQ50002A and BQ500511A in a Qi transmitter design.

In the datasheet, there is a "Demodulator input signal conditioning" circuit.

This circuit takes the "TANK" signal and feeds pins 11 (DMIN 1) and 12 (DMIN 2). See below, from the datasheet:

I cannot find any documentation that specifies either the operation or the design choices behind these components.

Is the intention that we just copy this circuit directly from the application design?

Could someone please explain how this circuit operates, or the reason for component choices?

Kind regards,

Robert

  • 0
    TI__Guru 65846 points
    Hi Robert
    The values in the data sheet should be used for the Demodulation circuit.

    Two demodulation channels are used, one is envelope detection and the other synchronous phase detection. At different points on the load range one will work better than the other.