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LDC1614: Device-to-device interference

K.Hamamoto
Guru 12155 points
Part Number: LDC1614

Hi

Our customer are going to use two LDC1614 for an inductive sensing. (5 inductors)

And they are concerned about an interference. 

Because they had an experience interference between channel to channel when they had measured with LDC1000 before. (At that time, they had used photo-relay to switch.)

In the case of LDC1614, LDC1614 has a MUX internaly to switch the channel. However for two LDC1614 they are concerned about device-to-device interference.

Could you give us any advice how we can reduce the affect of the interference between device-to-device

On the other hand, for internal MUX is ther any concerns about interference of channel to channel?

Regards,

Koji Hamamoto

  • 0
    TI__Genius 13335 points

    Hello,

    The channels of the LDC1614 are time-domain multiplexed so no two channels are ever oscillating at the same time. The inactive channels are held to ground when the active channel is oscillating so there will not be interference. If a second LDC1614 is used then the adjacent coils between devices should be separated by more than 50% of the coil diameter. Additionally changing the nominal frequency of oscillation by >10% between the devices will further reduce any potential interference. You can refer to the following application note for additional tips on preventing interference or EMI radiation of the coils on a system level: www.ti.com/.../SNOA962

    Regards,

    Luke

  • 0 in reply to Luke LaPointe
    Guru 12155 points
    Hi Luke,

    Thank you for the information.
    That was very helpful advice. I will discuss with our customer about above information.

    Regards,
    Koji hamamoto