What is the isolation/crosstalk between of analog signals and the digital control I2C signal

Question

Hello, 
 
 I am using MAX14662ETI+ as switches for my very noise sensitive analog reference signals. 
 The datasheet has the spec of THD+N/ crosstalk between the channels ( -80dB) and the off-isolation (-40dB). 
 However, my concern is what would be the isolation or crosstalk between the analog signal and the digital signal (I2C in my case). 
 The I2C has 100kHz clk and I am wondering if there would be any interference to the analog signals. 
 If you have any good number for the isolation or crosstalk between analog and digital please share it with me, 
 
 Thanks and Regards.

Christian · Accepted Answer

Hi JLEEPN ,

The MAX14662ETI+ does not directly provide specific figures for isolation or crosstalk between analog and digital signals. However, based on the general characteristics of the switch, the crosstalk between channels is -80 dB, and off-isolation is -40 dB. While these figures are for analog channels, they suggest a high level of isolation which might extend to digital signals as well.

At 100 kHz, the I2C clock frequency is relatively low. The lower frequency reduces the likelihood of significant interference with the analog signals, especially given the high isolation characteristics of the switch.

To further minimize potential interference, ensure proper PCB layout techniques such as keeping the analog and digital traces as far apart as possible, use separate ground planes for analog and digital sections, and consider using shielding techniques if the analog signals are extremely sensitive.

Best regards,
Christian

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What is the isolation/crosstalk between of analog signals and the digital control I2C signal