[sdiy] Oops! I meant the AD7245A 12-bit parallel DAC - Re: LF398 sources

[Harry Bissell]

If you try the best grades of 8 bit converters you'd probably be happy.
I used the DAC0800 (DAC08 replacement) and it worked fine for me. The DAC0802
is a more precise part, max nonlinearity of .1% of full scale

iirc the Scott Sites design used only 7 bits ???

H^) harry



----- Original Message -----
From: anthony <aankrom at bluemarble.net>
To: synth <synth-diy at dropmix.xs4all.nl>
Sent: Mon, 06 Dec 2010 10:55:21 -0500 (EST)
Subject: [sdiy] Oops! I meant the AD7245A 12-bit parallel DAC - Re: LF398	sources

Now that I remember, it wasn't the LF398 - eBay has scads of them. It was 
the AD7245A that Scot Stites used in his DAC-based CV voltage quantizer. His 
design is great. I've been trying to figure out how to use a 16 bit 
Burr-Brown PCM53-V that I got from a Teac CD player from 1985. (Old CD 
players are gold mines for parts salvaging - just like really old color 
scanners...) The datasheets confuse me about which is the MSB and which is 
the LSB.

I found a way to make a 12-bit DAC from two cheap 8-bit DAC's in one the 
volumes of the Encyclopedia of Electronic Circuits series, but it's not as 
elegant as simply using a single DAC.

I was really hoping to use the PCM53-V, but it's not a simple R-2R ladder 
all the way down for every bit.

I may end up just resorting to using a CD4024 and an R-2R ladder. It's been 
done and I have 300 100kOhm 1% resistors and a DMM that'll match them close 
enough to 0.1%.

Anthony
----- Original Message ----- 
From: "klosmon" <klosmon at sbcglobal.net>
To: "synth" <synth-diy at dropmix.xs4all.nl>
Sent: Monday, December 06, 2010 10:38 AM
Subject: Re: [sdiy] LF398 sources


> Jameco Electronics in San Jose, California stocks them.
>
> ~GMM
>
>
> anthony wrote:
>> I don't know if I'm just not looking in the right place or what, but I 
>> can't seem to find a supplier for the LF398. It's been a while since I 
>> checked, but I don't think mouser or digikey had any. I'm going to check 
>> again, but I thought I'd ask here if anybody had any - maybe for a parts 
>> trade? I have a lot of valuable parts that I've salvaged that are very 
>> synth-worthy.
>>
>> What would be the best circuit to substitute into a schematic that called 
>> for an LF398? Use an FET and cap in front of an op-amp like usual?
>>
>> Maybe I should check eBay. Hope I don't have to buy from Hong Kong...
>> Anthony
>>
>>
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-- 
Harry Bissell & Nora Abdullah 4eva