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A digital to analog converter, or DAC, is a device that takes a digital input, usually a word of some size, such as 8 or 16 bits, and converts the value of that word into some analog value, either a voltage or a current.

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14y ago
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13y ago

A digital input (in the form of a number) is converted into analog format, which could be a voltage or a signal frequency, for example. An example, which most people would be familiar with, is your touch tone phone. When you press a key on the phone, that is a digital input. The output is actually 2 frequencies mixed together (analog signal). Each row of keys on your phone is associated with a frequency, and then each column of keys is associated with a frequency. The two frequencies combined represent the row and column of the key that was pressed. At the phone company, they use analog filters to determine what frequencies were generated by your phone, and from that, determine which key was pressed (this is Analog to Digital conversion).

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11y ago

A digital to analog converter has drawbacks, but it has advantages of allowing signals to be controlled and processed to the best of speed and precision with the use of a micro processor. One can generate a perfect sine or triangular wave with a microprocessor and convert it into a real analog wave. One can process audio with a CPU or DSP and convert it back to audio. Once you have audio inside a processor the sky is the limit to what you can do with it and with custom firmware.

Then the use is also obvious for precision digital instrumentation such as reading a load cell, thermo-couple or any sensor, converting it into an industry standard 4-20mA , 0-20mA or 0-5V or 0-10V output for PLCs or other instruments to interface with.

Digital to analog converters may offer an economical and compact way to have precision signals. For a 24bit resolution, an 16.7million divisions of it's full scale deflection can be expected and perform thousands of conversions per second.

The drawbacks are that they don't always produce perfectly smooth outputs, which may be subjected to some quantisation noise and the use of external filters may be required in some cases.

Very nice technologies are available these days that allow SPI, I2C serial interfacing with high speed, high resolution and compact SMD chipsets at economical prices.

The thing to note is that a digital to analog converter is rather useless without a micro processor to control and feed it with data and commonly they are build into DSP (digital signal processors) already

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13y ago

Converting from analog to digital form consists of 2 process

* Sampling

* Quantization

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9y ago

In a DAC (digital to analog converter).

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14y ago

No.

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Q: Where is digital data converted to analog?
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Apakah perbedaan antara analog dan data digital secara umum?

apa perbedaan antara data analog dan data digital


What are types of data that can be electronically transferred?

In theory any data can be transferred electronically in the form of a organized series of values of zero(s) and one(s). Any kind of data is converted into digital form from analog form using ADC i.e. Analog to Digital Converter and then it is able to transfer over an electrical medium.


Does a digital signal travel farther than an analog signal?

You need to make a distinction between analog and digital signals, and analog and digital data. Digital data can be sent on an analog signal by using a modem. Digital data sent on a digital signal is done over a wire using voltage pulses at two or more levels. Digital signals can't travel very far without amplifiers, but analog signals can cover huge distances, such as with satellite communications and even communications with deep space probes.


What are the advantages of digital data compared to analog data?

Digital data requires less bandwidth than analog data (e.g. new digital television broadcast compared to old analog broadcast), so more data can fit in the same frequency (e.g. DSL compared to analog modems). This is the primary advantage, although it is also generally stated that data is easier to recover and more tolerant towards interference.


How are digital signals in radio broadcast converted to analog signals inside digital transmission equipment before sending the signals to the antenna for transmission?

The digital signals is not converted BACK to analog! it is transmitted in digital form and the receiver is converting it back to analog to drive the speakers. The signal from the microphone is converted from analog to digital with an A/D converter chip, digital signals consist of pulses of different lengths that is switching the transmitter on and off in about the same way as the old Morse code transmissions but at a much higher rate (millions of times higher)

Related questions

Why is a modem needed for analog telephone lines?

A modem (which stands for Modulator-Demodulator) converts digital data from the computer to analog data compatible with the telephone system. The analog signal is converted back into digital data on the other end of the call.


What is encoding technique?

There are four possible combinations of encoding techniques -Digital data, digital signal -Digital data, analog signal -Analog data, digital signal -Analog data, analog signal


What is the term used when digital values are converted to create an analog sound?

When digital values are converted to create an analog sound, the term used is Digital-to-Analog converter.


Is PCM is an example of analog to digital?

No, Pulse Code Modulation is a communication method used to carry digital data but is not part of any analog to digital conversion. PCM is often used to carry audio data as a digital stream and therefore is the encoding used as the signal is first converted to a digital format.


Does sound have to be converted from digital to analog for a computer?

No. Sound has to be converted from analog to digital for use by a computer, not the other way around. It is converted to analog so amplifiers and other analog equipment can use it and so you can hear it.


Is triangular wave is analog or digital?

It's usually analog, but digital signals can be converted, if needed.


What is the difference between a modem and a codec?

* Codec is for coding analog data into digital form and decoding it back. The digital data coded by Codec are samples of analog waves. * Modem is for modulating digital data into analog form and demodulating it back. The analog symbols carry digital data.


Is a PC process digital or analog data?

digital


Apakah perbedaan antara analog dan data digital secara umum?

apa perbedaan antara data analog dan data digital


What is the term for a device that converts digital data from a computer into analog signals and back again?

The devices are known very simply as analog to digital converters and digital to analog converters. They are frequently shorted to A-D and D-A converters. A complete analog to digital converter will not only convert the analog signal into a set of numbers, it will also format the digital data ready to deliver to the next step in the signal chain. In television, this means generating a fairly complex stream of data that will carry not only the picture but audio and other data as well. Digital to analog converters reverse the process and use the incoming data to generate an analog signal. In television, well know examples are the digital set top boxes. They receive digital data from an antenna and convert the numbers into analog audio and video signals.


What is the difference between analog and digital data transmission?

This is essentially the same question as the difference between analog and digital. With analog electronics a voltage is used to represent (or to be an analogy for) some physical attribute in the real world. So for an analog transmission, at its simplest, a sound signal (say) is converted to a voltage, the voltage sent down a cable, then at the other end the voltage converted back into sound with a loudspeaker. With a digital system, the physicial attribute is measured and sent as a series of numbers, the numbers being converted to binary. For a digital transmission, the sound signal is converted to a series of numbers, sent as binary, and converted back to a sound signal at the other end. The advantages of digital is that it makes multiplexing much easier - making it easier to put many signals down the same physical cable. It also makes compressing the signal much easier - this is particularly effective for digital television transmission; 30-40 digital channels can be sent over the same bandwidth as 4 or 5 uncompressed analog channels. Also, digital is much more resiliant against noise - the digital receiver has to make a decision about each bit - is it there or not; noise can be pretty extreme before this becomes impossible, with analog, once noise is added its very difficult to remove it. The historical disadvantage of digital is that digital encoding and decoding equipment was expensive compared with the analog. Over the last 10 years or so, digital electronics has become much cheaper and more powerful.


Why must sound and video input to a PC be converted from analog to digital?

Because in order to preserve the original sound, a digital sampling rate must be twice the frequency of the analog signalAnalog data is smooth and continuous, where as digital data, such as the binary data used in computers, has distinct gradations. The process of producing digital data by measuring data at a series of representative points is called sampling.