Prototyping with SMD

ezkcdude · 23rd May 2006, 03:57 AM

I'd like to begin prototyping a DAC, which will obviously have many SMD components. I think all the IC's and op amps can be put on DIP adapters, so those should be easy. The component I'm wondering about is the XO. For the actual PCB, I will most likely use a SMD chip. Is it o.k. to prototype using a pin- and voltage-compatible DIP chip, and then design the PCB using SMD components? I've been told the high frequency of the crystal (24.576 MHz) can be a problem during prototyping. I suppose many of you have a lot of experience with the general problem of prototyping SMD components. Can I get some recommendations? Also, while we're at it, are there any preferences for breadboards, protoboards, etc.? Thanks, in advance.

hagtech · 23rd May 2006, 06:28 AM

I would not recommend using adapter sockets, as the increase trace lengths can lead to stability problems. No way to get decoupling caps nice and close.

Probably worth the time to invest in a circuit board.

jh

poobah · 23rd May 2006, 06:42 AM

Goto DigiKey dot com and enter "surf board". That will give you some ideas. The socket adapters are OK... but could give you some problems as pointed out above.

In general. you can use through hole equivalents for prototyping. There are exceptions though and you'll only find them the hard way. Speed (frequency) would probably be the biggest factor... more speed... more problems.

Vector boards, described as "3 pads per hole with power & ground" work well for me... and I've dome some real fast one-off circuits with those. I think your 25 mHz, with through-holes would be fine... just keep things tight and tidy.

rfbrw · 23rd May 2006, 06:53 AM

Ha! Bunch of quiche eaters. This is how real engineers do it.
For the young, those blue things under the 'scope are called databooks.

poobah · 23rd May 2006, 06:56 AM

Hmmmm,

I guess you worked at Amdahl then?

poynton · 23rd May 2006, 07:57 AM

Quote:

Originally posted by ezkcdude
........... Can I get some recommendations? Also, while we're at it, are there any preferences for breadboards, protoboards, etc.? Thanks, in advance.

Look here...you may find something to suit.
I've used board #1560

www.onepasinc.com

Andy

ezkcdude · 23rd May 2006, 12:39 PM

Thanks, everyone, for being so responsive! I just won an auction on eBay for my first scope yesterday (Tek 465B), so I should have plenty to keep me busy. Full steam ahead...

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23rd May 2006, 03:57 AM	#1
ezkcdude diyAudio Member Join Date: Dec 2005 Location: Atlanta	Prototyping with SMD I'd like to begin prototyping a DAC, which will obviously have many SMD components. I think all the IC's and op amps can be put on DIP adapters, so those should be easy. The component I'm wondering about is the XO. For the actual PCB, I will most likely use a SMD chip. Is it o.k. to prototype using a pin- and voltage-compatible DIP chip, and then design the PCB using SMD components? I've been told the high frequency of the crystal (24.576 MHz) can be a problem during prototyping. I suppose many of you have a lot of experience with the general problem of prototyping SMD components. Can I get some recommendations? Also, while we're at it, are there any preferences for breadboards, protoboards, etc.? Thanks, in advance.

23rd May 2006, 06:28 AM	#2
hagtech diyAudio Member Join Date: Mar 2002 Location: Hawaii	I would not recommend using adapter sockets, as the increase trace lengths can lead to stability problems. No way to get decoupling caps nice and close. Probably worth the time to invest in a circuit board. jh

23rd May 2006, 06:42 AM	#3
poobah diyAudio Member Join Date: Nov 2005	Goto DigiKey dot com and enter "surf board". That will give you some ideas. The socket adapters are OK... but could give you some problems as pointed out above. In general. you can use through hole equivalents for prototyping. There are exceptions though and you'll only find them the hard way. Speed (frequency) would probably be the biggest factor... more speed... more problems. Vector boards, described as "3 pads per hole with power & ground" work well for me... and I've dome some real fast one-off circuits with those. I think your 25 mHz, with through-holes would be fine... just keep things tight and tidy.

23rd May 2006, 06:53 AM	#4
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	Ha! Bunch of quiche eaters. This is how real engineers do it. For the young, those blue things under the 'scope are called databooks.

23rd May 2006, 06:56 AM	#5
poobah diyAudio Member Join Date: Nov 2005	Hmmmm, I guess you worked at Amdahl then?

23rd May 2006, 12:39 PM	#7
ezkcdude diyAudio Member Join Date: Dec 2005 Location: Atlanta	Thanks, everyone, for being so responsive! I just won an auction on eBay for my first scope yesterday (Tek 465B), so I should have plenty to keep me busy. Full steam ahead...

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