THS1209: THS1209 differential interface problem

david zhang

Part Number: THS1209
Other Parts Discussed in Thread: MUX36S16, , THS4131, OPA2277

I am using THS1209 running at 5MHZ to interface with 128 sensors which is selected by mux36s16 one by one, the mux36s16 turn on frequency is 200kHZ. The interface between mux36s16 and THS1209 follow the reference design as in the attached figure. The prolem now is the soomth signals coiming out of from mux36s16 are become sharp pulse at T4-1 side. please give me some rules how to tune this intrafce.

Many thanks.

over 4 years ago

0 Tom Hendrick over 4 years ago

TI__Guru**** 180901 points

Hi there!

Can you provide more detail about the register settings you are using with the THS1209? Just to clarify, you have eight 16-CH muxes connected to the THS1209 input, right? What is the nature of the input signal? Can you provide a bit more setail on what you mean by 'sharp pulse'?

0 david zhang over 4 years ago in reply to Tom Hendrick

Prodigy 50 points

Hi,

Tom, the ouputs of my sensors are variable DC levels, I think transformer only can pass AC signals, I havd decided to use opam (OPA2277 and THS4131)instead.

Many thanks.

David

+1 Tom Hendrick over 4 years ago in reply to david zhang

TI__Guru**** 180901 points

Hi David,

That's right, you can't get DC through a transformer. Thanks for letting us know you've resolved the issue for now.

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THS1209: THS1209 differential interface problem