Electrical Engineering Stack Exchange
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Questions tagged [dac]

A DAC is a Digital to Analog Converter.

A DAC converts a given digital signal to an analog waveform.

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Why don't microcontrollers generally have on-chip DACs?

In this answer I read that microcontrollers usually don't have DACs, while they do have ADC. Why is that? edit I appreciate that integrating resistors like in an R-2R DAC is expensive in terms of real-estate (thanks Mike, for your answer), but I…
Federico Russo
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What is this squiggly trace for?

It's on pin 14, which is the master clock input (MCLK) of a WM8761: Low cost stereo DAC. I'm guessing it's meant to act as a small inductor? But why would you want that on a clock input?
endolith
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What is a brownout condition?

I'm reading the datasheet of this DAC. Page 27 states: In many industrial process control applications, it is vital that the output voltage be controlled during power-up and during brownout conditions. What are "brownout conditions"? Why is…
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Do you recognise this signal?

The story for this signal is the following. I've bought an NAD C 356BEE amplifier with an integrated MDC DAC module. It has optical and USB input. The optical is OK, but if I connect the DAC to my PC with USB, then it makes clicking/popping noise…
csadam
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What is a one-bit ADC good for?

I have recently heard of the concept of a one-bit ADC, and have seen it implemented in the context of a sort of digital-to-analog converter (oddly enough), and I'm wondering, what is the point? Why not simply use a higher-resolution ADC, if higher…
Mark
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Why can't this LM324 op amp reproduce a signal above a certain frequency?

There seems to be no shortage of circuits like this that attempt to use an R2R as a DAC and an op. amp. as an output buffer. These make sense to me so I decided to try and construct one. I constructed a slightly simpler circuit simulate this…
Eric Urban
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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 is 10 kHz.
azin
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How are HiFi DACs constructed?

My basic understanding is that a DAC is a sequence of R-2R resistances. However, the audio industry offers HiFi fans a variety of DACs, with prices going to thousands of $ for brand names. At the same time, we have other devices where the cost of…
bandi
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Is it possible to combine two 8 bits DACs together to create a 16 bit DAC, one byte of the 16 bit word shall be sent to each of them

For two DACs, one being sent D0-D7 and the other being sent D8-D15, with power supply being 5V, if 5V is added to output of 2nd DAC and then the two DAC outputs are summed, should result in a 16 bit DAC made up of two 8 bit DACs. The only problem is…
quantum231
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PCB microcontroller layout in a mixed-signal system

This is a direct continuation of this question. So here's my layout, what do you think about the microcontroller side? UPDATE April 2019: I built the board in spring/summer 2016, but never got around to updating the results here. The board works…
Timo
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Why should we need DAC ICs?

Please look at the schematic below. This is a very simple resistive adder that works fine with any standard ! (TTL,CMOS,...) or any arbitrary voltage that is fed into it. On the other hand as there is no active component in it, it is extremely fast.…
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Straight from the datasheet: Is this really a sensible filter circuit?

Cirrus Logic CS42426-CQZ is an audio CODEC that I want to use in a custom USB sound card. You can download the datasheet from there. On page 61, the datasheet has a recommended circuit for each A/D and D/A channel, but I fail to see the purpose of…
AaronD
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How do I get high voltage (200-500 V) out of a DAC?

I am working on a project in which I need to amplify a 0-3.3 V DAC output to 0-500 V (or to 0-200 V if 500 V iss too much to ask) and I need to draw up to 100 mA current out of this output. I also need to mention that my DAC output signal will…
spinmaster
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Why can the effective number of bits be a non-integer? What does this physically represent?

The effective number of bits (ENOB) describes the "real" resolution of an ADC. I paid no attention to it when I was first taking the class but now when I think about it I cant really make sense of it that the result can be something like 6.8 bits. I…
Emre Mutlu
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Reason for brief spike in op amp output when crossing 0V?

Does anyone recognize this spike in the output of an op amp when the signal crosses 0V? It spikes up when crossing up and down when crossing down. In one of the EEVBlog videos, Dave pointed to something exactly like this on the oscilloscope and said…
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