[hpsdr] [OZY] QFP or BGA?

[Alex]

I'd vote YES. 

I just verified with a reliable source in the packaging / circuit assembly field. It is economical to deal with BGA.
Higher density for smaller size. If you're worried about reliability, the bigger problem is the QFN.

My source got a chuckle out of the "toaster oven and solder paste" comment. So don't fear the BGA. Go for the extra I/O lines, you can never have too many I/O lines. 

I can deal with populating the OZY alpha boards.

Alex, N3NP

----- Original Message ----
From: Philip Covington <p.covington at gmail.com>
To: HPSDR List <hpsdr at hpsdr.org>
Sent: Thursday, May 11, 2006 10:42:37 AM
Subject: [hpsdr] [OZY] QFP or BGA?

***** High Performance Software Defined Radio Discussion List *****

Hi group,

Let's have a yes/no vote on using BGAs in the HPSDR project.

---------------------------------------------------------------------------------------------
Why:
---------------------------------------------------------------------------------------------
I intend to use the Cyclone II EP2C5 on the OZY board.  I am running
out of I/O pins with the QFP208 part unless I disconnect some of the
FX2 lines from the FPGA.

The QFP208 package (in the current OZY schematic) gives me around 142
I/O.  If we bumped up to the BGA256 package it looks like I get around
158 I/O lines (16 more).

The QFP208 package EP2C5Q208C8 is $13.90/qty 1 Digikey

The BGA256 EP2C5F256C8 is $14.90/qty 1 Digikey

Another alternative is the EP2C8 part with more LE/RAM/ETC...:

EP2C8Q208C8 in QFP208 with 138 I/O is $20.30/qty 1 Digikey <-less I/O,
not a real choice>

EP2C8F256C8 is BGA256 with 182 I/O is $23.50/qty 1 Digikey

73 de Phil N8VB

P.S. Eventually we will have to deal with the BGA/CSP/QFN packages.
The LTC2208, for example, only comes in the 64 lead QFN package.
_______________________________________________
HPSDR Discussion List
To post msg: hpsdr at hpsdr.org
Subscription help: http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org
HPSDR web page: http://hpsdr.org
Archives: http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/




 1147362005.0