Re: RCA to PCB connections

From: Barry (bg_ie_at_yahoo.com)
Date: 07/27/04 

Date: 27 Jul 2004 03:02:00 -0700

Thanks for your suggestion.

So basically I would have the bnc female connectors on each board
facing each other, with about 1cm between each. This will connect the
signal lines, but what about the ground lines? I could solder them
perhaps with a short lenth of copper wire, but I don't want to
interfere with the codec board.

How would your u-bend suggestion compare with the use of such a
connector -

http://www.ba-electronics.com/caa40b.jpg

with regard to signal to noise ratio? I guess it would depend on the
material - gold, tin etc. So, would I get the same performance with a
tinned u-bend and a tinned connector as in the diagram? I'd like to go
with your suggestion because this would give me only 1cm or so of
seperation between the two boards. This will allow me to design a
larger board.

The bnc connectors on my board appear to be tin plated and the
converters have a SNR of around 90dBs -

http://www.icet.pucpr.br/afonso/Graduacao/Outros/Audio/tlv320aic23-manual.pdf
http://www.tij.co.jp/jsc/docs/msp/da/products/pdf/tlv320aic23.pdf

Thanks for your help.

Barry.

legg <legg@nospam.magma.ca> wrote in message news:<bkgbg09bmkvf1hoi3j10vbpiblu4l5q2ic@4ax.com>...
> On 26 Jul 2004 13:31:54 -0700, bg_ie@yahoo.com (Barry) wrote:
>
> >Hi all,
> >
> >I'm designing a PCB board to interface to my DSP motherboard and Codec
> >Daughterboard. The Daughterboard PCB is about half the size of the
> >motherboard, and sits on the latter, interfacing via 2
> >SAMTEC&#8211;TFM&#8211;140 connectors.
> >
> >The Codec has 2 ADCs and 2 DACs, which have phono rca connectors as
> >follows -
> >
> >http://www.seniorindustries.com/prod_images/P-SI-374-X-X.jpg
> >
> >I only need to connect my PCB via these RCA connectors to the Codec,
> >so I was thinking of making my board about the same size as the Codec
> >board and sitting it on the remaining half of the DSP - there are two
> >holes available on the DSP for this purpose. I was then actually
> >hoping to find a connector similar to that in the last image, but of
> >the male variety. Unfortunately I cant find one. This would have
> >allowed my to easily connect the two boards together. Anyway, I'm now
> >wondering how exactly I should connect the rca connectors on the Codec
> >board to my pcb board, remembering that the two boards will be side by
> >side.
> >
> >Perhaps I should make a rca connector with a male connection on one
> >end (connecting to the Codec) and solder the opposite end to my PCB.
> >I'm not sure though about shielding in this case.
> >
> >Maybe the easiest option would be to put female bncs on my board also,
> >and connect the two via very short male-to-male bnc cables. Although I
> >think they might take up too much room between the two boards. The
> >codec is about 8cms in length, and my board would be of a similar
> >length.
>
> Solid tinned copper wire of a suitable gauge has been used to jumper
> RCA jack sets in the past. If these are female sockets, pointing in
> similar directions and with a fixed distance from center to center,
> the jumper becomes a simple U bend of tinned copper.
>
> RL

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