https://datasheets.maximintegrated.com/en/ds/MAX4885AE.pdf

 

My last message was supposed to be a quote for this "Have you at least looked at the CD4066 that I recommended...."
I don't know why it didn't work..

 

Someone suggested me this one https://gr.mouser.com/datasheet/2/115/DIOD_S_A0004048710_1-2542343.pdf
PI5A100

Which one should I actually use?

 

Someone suggested me this one https://gr.mouser.com/datasheet/2/115/DIOD_S_A0004048710_1-2542343.pdf
PI5A100

Which one should I actually use?

Post #17 or #21 would be a better choice.

 

Someone suggested me this one https://gr.mouser.com/datasheet/2/115/DIOD_S_A0004048710_1-2542343.pdf

Not bad, but not great. Looks like a pin-for-pin drop-in equivalent to the part in post #17, but with a bit worse performance.

2 ohm flatness in a 75 ohm circuit is almost 3%. This will show up in the switched signal as differential gain. Not a full 3% DG, but probably around 1%. Compare this to a mux designed specifically for video, which will come in at less than 0.1%. Also, the off isolation will be higher.

In a part like this, the actual switch circuit usually is a single p-channel MOSFET in series between the in and out pins. In a true video mux part, it is three FETs (2 p-channel, 1 n-channel) or bipolar transistors in a T arrangement. The shunt leg is where the way better off-isolation comes from.

Here is a true video switch for comparison. Note that this part also has the output cable drivers built-in. That is a big advantage, as often the performance of a great switch is degraded by the output amplifier pc board layout.

https://www.analog.com/media/en/technical-documentation/data-sheets/AD8188_8189.pdf

You are 20-30 years too late with this question. Back then, Maxim had a pile of video-specific chips, including many configurations of muxes, that were fantastic. Geezers who designed video circuits in the 70's still drool over them.

ak

 

Not bad, but not great. Looks like a pin-for-pin drop-in equivalent to the part in post #17, but with a bit worse performance.

2 ohm flatness in a 75 ohm circuit is almost 3%. This will show up in the switched signal as differential gain. Not a full 3% DG, but probably around 1%. Compare this to a mux designed specifically for video, which will come in at less than 0.1%. Also, the off isolation will be higher.

You are 20-30 years too late with this question. Back then, Maxim had a pile of video-specific chips, including many configurations of muxes, that were fantastic. Geezers who designed video circuits in the 70's still drool over them.

ak

Sorry, I forgot I wasn't born by the time.

 

Guys I couldn't find any of the components for buying, isn't there any IC that could be found worldwide? One that is more popular.

 

It is possible to make a SPST pushbutton triggered toggle stage out of 2 CMOS inverters. Take a look at: https://www.codrey.com/electronic-circuits/cmos-toggle-switch-with-cd4049/ but I suspect in their schematic feedback resistor R2 should be 10K, not 100K.

 

I can't say for sure, but I believe it is really a replacement for a 4PDT switch that I need.