SN74CBTLV16292: MUX output

Ho Scorpio

Intellectual 500 points

Other Parts Discussed in Thread: SN74CBTLV16292

art Number: SN74CBTLV16292

HI TI pals

I use SN74CBTLV16292 as BT656 signal mux, When I measured the clock(14x MHz).

The two outputs looks strange(blue is 9B1, green is 9B2)

Is this not suitable?

S is low

S is high

over 7 years ago

0 Adam Torma over 7 years ago

TI__Mastermind 45625 points

Ho,

Thank you for your question. What is your expectation on how the device should perform?

Is your clock a 3.3 V 14MHz square?

Can you provide a scope shot that shows the A pin with B1 and B2?

The logic pin S going from high to low seems working as it is attenuating the signal of the unselected channel.

Thank you,
Adam

0 Ho Scorpio over 7 years ago in reply to Adam Torma

Intellectual 500 points

Hi Adan

It's a 3.3V around 147MHz~149MHz clock signal of BT656 video format signal.

B2 should be no signal when I choose B1, even there's some crosstalk effect.

You could see another is almost 1Vp-p, it's not reasonable

0 Adam Torma over 7 years ago in reply to Ho Scorpio

TI__Mastermind 45625 points

Ho,

Have you determined if the cross talk is from the board or from the IC? Is there much cross talk if you remove the IC and short the signal path?

Something that is also strange to me is that your waveforms are out of phase which is part of the reason I was looking for a scope capture of the input as well as the output.

Thank you,
Adam

0 Ho Scorpio over 7 years ago in reply to Adam Torma

Intellectual 500 points

HI Adam
We found the influence is affected by the OSC of the source IC.
The OSC output is too powerful; therefor, it affects both power source and ground.
The clock signal from the source IC is affected too.