Somebody know this ic? - Page 1
Forum section: electronics / beginners

author: xiran64
author_rank: Newbie
timestamp: September 19, 2023, 08:38:57 pm
content: Hi to everyone!I want to know, if somebody know something about this ic´s in the attached pictures (one it´s labeled: "a34 2248", and the other is: "2057 wow1", both in smd structure).It is used to switch between two hdmi signals.I´ve searched about they, without luck...Thanks in advice!!!

author: xiran64
author_rank: Newbie
timestamp: September 20, 2023, 12:30:10 am
content: I made this:

author: MikeK
author_rank: Super Contributor
timestamp: September 20, 2023, 07:40:36 pm
content: I thought for sure someone on here would know.

author: wraper
author_rank: Unknown
timestamp: September 20, 2023, 07:56:54 pm
content: How can it switch between two HDMI signals when there is not enough pins or that? Just a single input without DDC will take 8pins, so two inputs and one output will take 24 pins alone. Or are there multiple of these?

author: xiran64
author_rank: Newbie
timestamp: September 20, 2023, 08:19:00 pm
content: It´s correct wraper, i use 2 ic, one for drive 4 ch, and the other for drive the rest 4 ch. I want to simplify my actual design, i use an dcdc booster to up the voltaje (5v to 15v for the cd4066 to obtain the lowest Ron accordingto datasheet of it, i´ve use an 15v power supply directly too, for the theme of 1.2 Mhz frecuency of the booster to made tests).But i want to simplify it, because i need to use a transistor to tranform the control pin 3v3 to 15v, to activate the cd4066.

author: wraper
author_rank: Unknown
timestamp: September 20, 2023, 09:22:34 pm
content: Using CD4066 for HDMI sounds insane. Even without considering other aspects of signal integrity, switch resistance is way too high. From your answer it's not quite clear what your intentions. Do you want to figure out what these are to use in your own design or what? If that's the case just buy something well documented, like thishttps://lv.mouser.com/ProductDetail/Diodes-Incorporated/PI3WVR13612ZLEX?qs=fAHHVMwC%252BbgbgoghYvhyNQ%3D%3Dhttps://www.diodes.com/assets/App-Note-Files/PI3WVR13612-DP1.4-HDMI2.0-Mux-Demux-Appnote-rev2.0.pdfOr any other that suits your needs.https://lv.mouser.com/c/semiconductors/switch-ics/video-switch-ics/

author: wasedadoc
author_rank: Super Contributor
timestamp: September 20, 2023, 09:31:15 pm
content: The multiplexed video and audio signals in HDMI connections run at hundreds of MBit/s, even into the Gbit/s range.

author: xiran64
author_rank: Newbie
timestamp: September 20, 2023, 10:29:07 pm
content: Yep, if i use 4 cd4066, one soldered in top of each, making two pairs of them it works!, but i´ve three bad things:1) i need a dcdc converter to 15v, from 5v usb power supply, to reduce Ron to the minimum in cd4066 according to the datasheet.2) one transistor converter to control cd4066 at minmal Ron (Vin=15v), my uC delivers 3v3 signal control pin.3) 4 ic cd4066, not 2.So, i´ve see the device that make that thing with a two ic (a34 2248) more simple and stable.The idea, is to interrupt the tmds signals fisicaly (8 channels, 4 each), from one device. The other, my uC generate the another hdmi signal, so, i can control it via software.Edit, it´s 4 ch, each ch is + and -.

author: BillyO
author_rank: Super Contributor
timestamp: September 20, 2023, 10:49:06 pm
content: I'm not sure I understand. If it's your design why do you need anyone to identify the chip you used? Did you get a bad concussion in the interim?

author: xiran64
author_rank: Newbie
timestamp: September 20, 2023, 11:19:29 pm
content: If you can go from point A to point B, reccorring 100 mts with $5.00 dls, but if you investigate that you can do the same, going from point A to point B, recorring 70 mts with $2.00 dls, plus, more stable and secure, which option you choose?The point is, "do it better", not, "if it more or less work, then, left just like that"

author: RES
author_rank: Regular Contributor
timestamp: September 21, 2023, 08:20:10 pm
content: https://www.onsemi.com/pdf/datasheet/fusb340-d.pdf?2057 (sot-23-6) -> Low Voltage SPDT Analog Switch CHIP

author: xiran64
author_rank: Newbie
timestamp: September 21, 2023, 09:45:35 pm
content: Hi RES!That´s it pin compatible!it´s not hdmi focused, but i see it works!