Posts Tagged ‘DAC’

App note: DAC ICs: How many bits is enough?

Sunday, June 11th, 2017

A very old application notes from Analog Devices that tells about Nyquist Theorem, sampling rate and quantization used on DACs. Link here (PDF) At the heart of every digital audio playback system lies the single-most critical component for high-fidelity audio: the digital-to-analog converter (DAC). These converters handle the delicate task...

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Posted in app notes | 2 Comments »

App note: WM8731 Suggested power-On/Off sequence

Sunday, April 3rd, 2016

Interesting app note from Cirrus Logic on how to minimize popping sound on the output when turning on/off the DAC on their WM8731 digital to analog converter. Link here (PDF) As with any consumer audio product, it is important that any on/off power noise be kept to a minimum. Generally,...

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Output voltage control of DC/DC converters

Friday, February 5th, 2016

Thomas Fischl writes: Some applications needs to control the output voltage of a dc/dc converter instead using a fixed output voltage. For example battery chargers has to adjust the output voltage to the current battery level. This page shows how to add such a control function to a buck converter...

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Posted in how-to | 1 Comment »

App note: Using the DAC as a function generator

Sunday, February 22nd, 2015

A function generator from an C8051 DAC application note(PDF) from Silicon Labs This document describes how to implement an interrupt driven multifunction generator on C8051 devices using the on-chip digital-to-analog converter (DAC). Four different waveforms expandable to any periodic function defined in a table. - Sine Wave (Table Defined) -...

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16F1509 ramp generator using the internal 5-bit DAC

Tuesday, April 22nd, 2014

Charles Douvier of PNW/Electronics writes: Turns out the DAC is probably the easiest peripheral I’ve used on the PIC. It took me longer to wait for the PICKit to update from 18F configuration to 16F. BUT.. if you’re having issues.. here you go: A simple voltage follower (or however you...

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Posted in PIC | 1 Comment »

Extending DAC resolution using digital potentiometer

Monday, March 10th, 2014

Kerry Wong writes: One way to extend the resolution of a digital-to-analog converter (DAC) is by employing a sigma-delta converter in software. The main disadvantage of such approach is the slow speed. Alternatively, we can use some extra hardware to extend the usable resolution of a DAC. In this post,...

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Posted in Arduino, AVR | 5 Comments »

App note: Audio and waveform generation using the DAC in STM32 microcontroller families

Sunday, March 9th, 2014

App note on utilizing the built-in DAC on your STM32 micro. This application note gives examples for generating audio output signals using the Digital to Analog Converter (DAC) peripheral embedded in the STM32F10xx microcontroller family. The STM32 DAC module is a 12-bit word converter, with two output channels for supporting...

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Posted in app notes | 2 Comments »

An isolated DAC using PWM output

Wednesday, October 2nd, 2013

Kerry Wong writes: Arduino‘s (ATmega328P) PWM outputs via analogWrite can be conveniently turned into analog voltage levels through the use of simple RC filters. Since the PWM outputs are not isolated, using them to drive other devices directly could be potentially dangerous. This is especially true if the target circuit...

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Posted in Arduino | 2 Comments »

Aud-I/O I2S audio breakout

Tuesday, November 13th, 2012

Bertho is working on a breakout board for the WM8782 I2S ADC and the WM8523 I2S DAC. The boards are intended to be interfaced with an ARM micro-controller. I am working on a project that requires some real audio and I always wanted to play with I2S (attached to an...

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Posted in ARM, project logs | 5 Comments »

App note: Calculating the error budget in precision DACs

Saturday, April 28th, 2012

How to chose a voltage reference and digital to analog converter chips to get the precision and stability you need: This application note focuses on Maxim's 3-terminal voltage references and precision DACs. To design a system, one must first understand how the parts are specified and then how their performance...

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Posted in app notes | 3 Comments »

App note: Digital to analog interface fundamentals

Sunday, April 22nd, 2012

Analog Devices describes the fundamentals of working with digital-to-analog converters: This tutorial outlines some important issues regarding DAC interface circuitry including the voltage reference, analog output, data input, and clock driver. Because ADCs require references and clocks also, most of the concepts presented in this tutorial regarding these subjects apply...

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Posted in app notes | 1 Comment »

FIRST DRAFT: Programmable dummy load

Thursday, January 26th, 2012

  This is a programmable current sink, usually used to simulate  different current loads for power supplies. We have always wanted to build one, but we've stalled several times. This design is based on the simple analog load posted by Bearmos. It's not intended to be a final project, it's...

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Posted in Prototypes | 4 Comments »

openHiFi open source digital music player update

Thursday, December 15th, 2011

[embed][/embed] Brian is hard at work designing an open source HiFi stereo digital music player. A Cortex M3 decodes various audio formats and sends them to a digital to analog converter audio IC via an I2S interface. This is all implemented on his Procyon development board. In this video he...

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App note: Building a stable DAC external reference circuit

Sunday, October 9th, 2011

Having a stable external reference is important in digital-to-analog converter design and this app note helps. For a DAC to function properly it must have a stable reference to create a precise output signal. Unfortunately because it is a simple concept, proper reference design is usually overlooked. In this app note from...

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Simple LaunchPad DAC

Friday, June 17th, 2011

NJC's MSP430 LaunchPad Blog presents this short tutorial on using DAC with the LaunchPad. He writes:This post will show you how to generate a periodic analog signal using the LaunchPad and the MSP430G2231. For the sake of simplicity, I stuck to the default DCO value. This will allow us to...

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Posted in code, how-to, MSP430 | 1 Comment »

CPLD VGA resistor DAC

Friday, May 6th, 2011

Chris from Pyroelectro informs us of his new tutorial describing the design of a VGA controller that uses a resistor DAC to create 512 unique VGA colors. He uses an Altera CPLD and VHDL code to create all the video signals. The theory, hardware schematics and software are all explained...

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Posted in CPLD, how-to | No Comments »

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