Home > resistors > Best/cheapest way to cheaply get a 5-bit DAC: R-2R, or R = 2^N

Best/cheapest way to cheaply get a 5-bit DAC: R-2R, or R = 2^N

October 30Hits:28

I can either use an R-2R divider or a R = 2^N divider to get a 5-bit DAC.

  1. Which will be more accurate? R = 2^N I suspect, but;
  2. Which will be cheaper? I think R-2R because it can use standard values, but...
  3. I've heard R-2R have issues with monotonicity, when the output doesn't change for the same amount with each count. Would this be an isuse with 5-bit DAC - would any such monotonicity simply be overwhelmed by divider error?
  4. There's also the trade off of size, R = 2^N will be larger.
  5. Also there's the possibility of using an IC to do this. I'd be open to doing this as well, if it wasn't very big and could be interfaced over I2C.

The DAC is going to be used to feed a comparator. The comparator will use this reference to compare against an incoming video signal.


If it were me I would use an IC to do the DAC for me. The manufactures of the ICs take a lot of time and consideration for getting matched components and put them in the best configuration.

The TC1320EOA is probably a good solution for what you want. It has I2C and in an 8pin SOIC configuration. I bet you will be hard pressed to get a design this small if you take into account the traces from your micro as well as the resistors and possibly smoothing caps and such. It has 8 bits of resolution, which is more then you need, but I wouldn't think this would be an issue. I also think the cost of it will be fairly equal if you account for the more pins needed on your micro for a home brewed solution and the PCB space required.

If you have a spare PWM output on your micro, driving it into an RC filter will be the cheapest way to do this, and will take up very little space. This will be slower than the resistor arrays though.

Tags:resistors, dac

Related Articles

  • Best/cheapest way to cheaply get a 5-bit DAC: R-2R, or R = 2^NOctober 30

    I can either use an R-2R divider or a R = 2^N divider to get a 5-bit DAC. Which will be more accurate? R = 2^N I suspect, but; Which will be cheaper? I think R-2R because it can use standard values, but... I've heard R-2R have issues with monotonicit

  • Minimum standalone graphics card requirements for dual monitor displayFebruary 25

    I am researching on hardware requirements for my new PC. One of my requirements is to have dual monitor display to use while programming. I understand that most integrated graphics cards do not support dual monitors (?), and I will need a standalone

  • Can I turn an internal PCI-E audio card into external cheaply?

    Can I turn an internal PCI-E audio card into external cheaply?January 25

    I like listening to music, but the one thing I can't get with the mobile devices (players, smartphones, notebooks) is the volume and clarity I get from my desktop pc audio card. It's nothing special, the cheapest PCI-E x1 Sound Blaster card, but some

  • What's the cheapest way to set up Hyper-V to be able to do failover?October 13

    We've got VMware as our enterprise VM solution using a SAN but we're looking into the possibility of using virtualisation in-branch. This might mean ESX or Hyper-V. As I understand it, to be able to do failover with either host, you need shared stora

  • What is the cheapest way to set up a live video webcast? December 24

    Possible Duplicate: Live Video on website, conferencing What is the cheapest way to set up a live video webcast? --------------Solutions------------- ustream.tv, and a webcam. Tinychat also is great for ad-hoc video broadcasts. Many developers use it

  • cheapest way to run SQL server?January 26

    I have two fresh Win2K3 boxes (Quad Core 2.5GHz, 4GB ram) which need SQL Server on them. I need to buy licenses/set them up but am not too sure of the application requirements other than that it wil be a single reasonably small website to start witho

  • Cheapest service to host a DNS server?March 7

    Apologies for sounding dumb. I'm still trying to figure my way around. I specifically need to setup a public DNS server and would like to know which would be the cheapest datacenter with the minimum configuration of a server to make it work... i'm no

  • Cheapest server to run Windows 2008 R2?March 16

    I want to build a really cheap server to use for testing etc but don't want to spend alot of dough. Any recomendations on what kind of home pc/server would work for these requirements? Any place to get refurbs at a good price? Minimum: 1.4 GHz (x64 p

  • Cheapest way to remotely control 120v outlet via ethernet?April 3

    What is the cheapest solution to be able to remotely power cycle a regular 120V outlet via ethernet? I've seen solutions like iBoot, but they're really expensive. Is there a cheap way to remotely power cycle equipment? --------------Solutions--------

  • How can I sign a PDF document quickly and cheaply?

    How can I sign a PDF document quickly and cheaply?May 3

    I need to sign a PDF document. However, Adobe Reader does not let me sign documents. I just need to sign the document, not edit it. Do I need to buy the full Acrobat software? Or is there a better, simpler way? --------------Solutions------------- An

  • What is the cheapest non-colocation way to serve about 10 static files at a rate of 100 megabits per second to the web? June 6

    I've looked at Amazon S3 and it costs roughly $4746 per month for 100 megabits/s (which translates into 31,640 Gigabytes of data transferred. That's at a rate of $0.15 per gig.) I haven't found a cheaper "cloud" option. I'm curious if there's an

  • What's the easiest/cheapest variable-frequency sine wave oscillator?August 8

    A Google search will give you a few billion ideas. Which is the simplest/easiest/cheapest that you know of? Generating a square wave and then filtering out the harmonics isn't a good solution unless the filter frequency can be varied along with the s

  • Cheapest single board computer which can run Linux? August 30

    I'm searching for the cheapest single board computer which can run Linux. It must have ethernet and at least one serial port. I'm currently looking at these modules from Technologic Systems, but wondering if there's anything cheaper out there? http:/

  • Cheapest reverb to stick in analog audio circuitry?September 28

    What are the cheapest (<$5 in large quantities) reverb implementations you can think of for interfacing with analog audio circuitry? It can be crappy but, of course, better is better. --------------Solutions------------- Another option is a Microchip

  • Easiest and cheapest way to get digital outputs from a computer to the real worldSeptember 30

    I need a number of digital outputs to connect my computer to the real world, however it seems that this job is not nearly as easy as I had hoped. I've looked into a number of different methods, ranging from dedicated digital I/O cards, micro controll

  • Best/Cheapest way to buy five microsoft office licences (2010 ed.)s October 26

    Can anyone give me some hints on the best/cheapest way to buy five Microsoft office licences (2010 ed.) for a charity? --------------Solutions------------- You might check out TechSoup (http://home.techsoup.org/pages/default.aspx). They do licenses f

  • Amazon Ec2 cheapest possible solution November 24

    I currently run a couple of very small sites on a Webfaction VPS. It is not very powerful, but for as low as $100 / year I can run a couple of blogs and do all my experimentations on a server and the support is excellent. I'm interested in Amazon Ec2

  • How to achieve this WiFi setup in the cheapest way?January 21

    I'm setting up a WiFi network for a small NGO here in Bolivia, so it means we are trying to do it on the tightest budget possible. The site comprises 2 buildings about 100 meters apart from each other. We want to have one WiFi access point in the mai

  • Could you suggest me the cheapest and most "basic" hosting/server solution for my website? January 27

    Possible Duplicate: How to find web hosting that meets my requirements? My website (a soccer portal, containing Joomla and SMF) in the last months has grown so much that the shared-hosting service I bought about three months ago has decided to rescin

  • What's the cheapest way to detect vibration with Arduino?March 29

    What's the cheapest way to detect vibration with Arduino? What's the vibration sensor that I need? I want to detect PING PONG NET vibration and light on led if touched. --------------Solutions------------- Piezo sensors are cheap, reliable and design

Copyright (C) 2017 ceus-now.com, All Rights Reserved. webmaster#ceus-now.com 14 q. 0.252 s.