Electronics > Projects, Designs, and Technical Stuff

Acute Logic & Lead CCTV PE-1005S HD Camera Module

<< < (11/13) > >>

dexters_lab:

--- Quote from: CJay on November 20, 2019, 06:46:05 am ---
--- Quote from: OzOnE on November 19, 2019, 11:28:52 pm ---The ADV7171 also only has an 8-bit wide input bus, whereas the camera outputs 16-bit.

You could maybe feed the separate H/V syncs to the chip, but you'd still need a small CPLD to combine the Luma and Chroma samples first.

In theory, that would also get around the need to convert the pixel clock, as the ADV7151 would just output analog video.

--- End quote ---

Umm, unless I misunderstood the datasheet it definitely claims to have 16 bit input, also has H/V sync inputs. Interesting little chip that solves many of the problems I was going to use an FPGA for, I may spin a board and play with them anyway, even if they're not suitable for the camera.

--- End quote ---

ahh ok, yea looks like your right Clint, sorry!!

Will have to examine the datasheet in some detail to see if it can be compatible with the output of the camera... it certainly looks pretty close

dexters_lab:

--- Quote from: Yansi on November 19, 2019, 11:12:46 pm ---Why not encode and serialize the SDI directly in the FPGA and use just a cable driver after that?

//EDIT: First google result for a HD-SDI serializer + driver: LMH0340 (and less capable derivates). Nice package, but fuuuuuuuuck the price.  (but bearable price from the wild east)

--- End quote ---

Speed i think is the issue, SD-SDI is ok (270mbps)  but once you make the jump to HD the output serial speed goes nuts (approx 1.5gbps)

Yansi:
Sure, and 3gbps for 3G-SDI.  >:D  (Cyclone IV GX series should be able to do it)

I have put down a bit of thought how could I approach the camera myself - and ended up with Cyclone IV FPGA. Essentially, it is the same as the MAX10 internally, but larger.

I have found that I can buy Cyclone IVs from china for as low as a couple of bucks - so out of curiosity, I have ordered a bunch of cheap (up to suspiciously cheap) EP4CE6E22C8N. Very interested if or what will arrive.

EP4CE6E22C8N is the smallest of them in LQFP144: 6.3kLE, 270kb ram. Comparing to the MAX10 OzOnE has used, this shall be enough.

Disadvantage is, that I need at least 3 power supply voltage (Vcore, PLL, Vio) and a configuration flash (EPCS4).  But it does not seem too difficult and I would make the PCB 4 layers anyway.

First I'd have to make myself more familiar with VHDL (it's been years since I've touched it) and the FPGA itself, including probably the new Quartus software (I have only 13.1 installed currently).  Let's hope it'll go well.

//EDIT: Grammar. :-/

dexters_lab:
So it seems everyone wants to do their own thing with this camera, given one of the hurdles is the connector so how about i make a passive breakout PCB that can mount on the bottom of the camera and breakout all the pins to something easier to work with like a 1.27mm pitch pin header?

That way it'll make it simpler for you all to use with whatever FPGA/SDI/Video ICs you want

I should be able to get my channel sponsor to cover the costs to make the boards

let me know what you all think?

Yansi:
https://cz.mouser.com/datasheet/2/315/AXT%203%204-1196688.pdf

I don't see anything difficult on that connector. 0.4 pitch is standard even on LQFP ICs and the pins stick out on the sides almost 0.5mm, no hidden GND pads under the connector body itself.

Try soldering one of the SMD SATA connectors, or just one of these modern Samtec connectors for high speed digital, that has the GND knife in the middle, such as QTH-030-02-F-D-A. https://www.snapeda.com/parts/QTH-030-02-F-D-A/Samtec/view-part/
That is what I call i difficult to solder connector.

Also don't see a reason why a 60-70MHz bus shall be routed through a piece of likely impedance-inappropriate extender - or not?

But I am not against that in any way! Just thinking it may not be necessary.

//But maybe I won't care anyway, as I will probably not receive a camera. Seems some shipping problems, in between the seller and/or the transport company? Not sure yet.//

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod