anyone recomend an D to a Converter

[Ansil]

preferably in a dip package  is there an eight pin pone,, only thing i can find is like 40pin soic

anyway i am finishing up the idea that i started about the computer ram as a delay module.  thanks to peter Snowberg for the original breakdown.

also if you have anything to add please do, as you were the brainCHild of this idea


i am using a tc514256dram

[Peter Snowberg]

What bit width are you looking for? I would recommend looking for something about 12 bits wide.

Things are getting pretty small these days, but Surfboards make it easy to use a singe SOIC chip when the rest of your circuit is all DIP and you're using perf. I don't know if they have an adapter for the chip you're looking at, but they have a bunch.

in DIP land, the LTC1450 has a 12 bit parallel input and it comes in a 24 pin PDIP package. For a 12 bit A/D on the other side, something like the LTC1272. It has built in sample and hold, takes a single +5 supply (bias your input to 2.5V), and is pretty easy to use.

Now the DRAM on the other hand.... that stuff is a serious pain to use unless you have a DRAM controller which usually means a gate array or a fast microcontroller and some programming. I would suggest using an SRAM because you can get 2 meg SRAMs these days in a single package and you don't have to deal with any kind of refresh circuits. The absolute easiest memory chips to use are FIFOs which is short for First-In-First-Out. They work like digital BBDs, but they're expensive on a per-bit basis. There are not many FIFOs these days, but I think they're still made by TI, Cypress Semiconductor, and OKI for a couple of sources. The great thing about FIFOs is that you don't need any address generation logic to make them work as delays.

Take care,
-Peter

[Ansil]

ahh ok..  well i was lookin at that on the net, seeing as i do not know jack about ram and such, lol so much appreciated for that.

afar as converters i dont' rem which ones i already have,  i do however have the 12bit  one as you suggested,  i ordered a few of them a while back,  and got them in recnetly. i guess i will have to find some Sram.

and get me a 12bit d to a.

thank you peter


also just checked out the surfboards..  hmmmm very interesting, was wodnering what it was called when you do stuff like that, very handy indeed