[TI博客大赛][原创]LM3S811之基于PWM的DAC http://bbs.ednchina.com/BLOG_ARTICLE_3005301.HTM http://www.fpga4fun.com/PWM_DAC_3.html One-bit DAC Take one pin of an FPGA, connect a speaker and listen to an MP3? Easy. Here, we'll use a PC to decode an MP3, and then s…

http://analogtalk.com/?p=534 http://analogtalk.com/?p=551 Posted by AnalogAdvocate on April 09, 2010 Design, General In today’s highly competitive electronics environment, designers are constantly looking for ways to reduce overall system costs.  One…

虽然STM32F103ZET6具有内部DAC,但是也仅仅只有两条DAC通道,并且STM32还有其他的很多型号是没有DAC的.通常情况下,采用专用的D/A芯片来实现,但是这样就会带来成本的增加. 不过STM32所有的芯片都有PWM输出,并且PWM输出通道很多,资源丰富.因此,我们可以使用PWM+简单的RC滤波来实现DAC的输出从而节省成本. PWM DACPWM DAC的构成原理PWM本质上其实就是是一种周期一定,而高低电平占空比可调的方波.实际电路的典型PWM波形,如下图所示: 针对PWM的波形…

how determine the RC time constant in PWM digital to analog low-pass filter? I 'm looking for the best RC time constant and its reason in a PWM to convert digital signal to analog based on duty-cycle and frequency and other parameters. PWM frequency…

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An inexpensive way to implement high-resolution digital-to-analog conversion is to combine microcontroller-PWM (pulse-width-modulated) outputs with precision analog-voltage references, CMOS switches, and analog filtering (Reference 1). However, PWM-D…

http://www.edn.com/design/analog/4337128/Make-a-DAC-with-a-microcontroller-s-PWM-timer Many embedded-microcontroller applications require generation of analog signals. An integrated or stand-alone DAC fills the role. However, you can often use PWM si…

how to generate an analog output from a in-built pwm of Atmega 32AVR microcontrloller? you need a resistor, a capacitor and an opamp. opamp is not really necessary when you are driving a mosfet, but will make life a bit easier. just be aware, that th…

The Secret Mixed-Signal Life of PWM Peripherals Pulse-width modulation (PWM) peripherals have enjoyed a long association with microcontrollers and power control, starting with motor control and power conversion. For the most part, these applications…

开发指南V1.0库函数版本,PWM DAC实验 350页 STM32 的定时器最快的计数频率是72Mhz,8 为分辨率的时候,PWM 频率为72M/256=281.25Khz.如果是1阶RC滤波,则要求截止频率为1.77Khz,如果为2阶RC滤波,则要求截止频率为22.34Khz.一阶RC滤波截止频率为什么是1.77Khz,二阶为什么是22.34Khz?怎么得来的?这两个频率和PWM频281,25Khz之间有什么关系?看了傅里叶展开,没看出他们之间的关系,很困惑,望原子指点. pwm dac生成…