[sdiy] 4 bit D2A converter

[dan snazelle]

THANKS A LOT!

ordering some now





On Oct 2, 2011, at 12:47 PM, Tim Ressel wrote:

> Mouser 81-RGSD8L203G
> 4-bit R2R ladder, 20K
> 
> $1.10
> 
> Or you can just get some resistors and make your own. I prefer the packaged version. Smaller and lazier. 
> 
> 
> --Tim (lazy sob) Ressel
> 
> 
> 
> ----- Original Message -----
> From: Tom Wiltshire <tom at electricdruid.net>
> To: dan snazelle <subjectivity at hotmail.com>
> Cc: synthdiy diy <synth-diy at dropmix.xs4all.nl>
> Sent: Sunday, October 2, 2011 9:21 AM
> Subject: Re: [sdiy] 4 bit D2A converter
> 
> 
> On 2 Oct 2011, at 05:29, dan snazelle wrote:
> 
>> I am putting something together which requires a 4-bit D2A.
>> 
>> is there a way to use an 8 bit D2A chip somehow and maybe just ground the lowest least significant bits?
>> 
>> or would an R2R be the way to go for so few bits?
> 
> I'd definitely look at either R2R or weighted resistor values for so few bits. A whole DAC chip seems like overkill.
> 
> One possibility would be to use an op-amp inverting mixer, with four weighted inputs (5K, 10K, 20K, 40K?). I know logic voltages vary a bit, but it'd be close enough for four bits.
> 
> HTH,
> Tom
> 
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