46. For the PAC1 counter, which pin is used for the input pulse? 1. In a DAC, in
ID: 2989852 • Letter: 4
Question
46.
For the PAC1 counter, which pin is used for the input pulse?
1.
In a DAC, input is ______ (digital, analog) and output is _____ (digital, analog).
2.
In an ADC, input is ______ (digital, analog) and output is _____ (digital, analog).
3.
DAC0808 is a(n) ____-bit D-to-A converter.
4.
(a) The output of DAC0808 is in ______ (current, voltage).
(b) True or false. The output of DAC0808 is ideal to drive a motor.
53.
What is signal conditioning?
54.
What is the purpose of the LM336 Zener diode around the pot setting the Vref in Figure 13-21?
SECTION 13.4: DAC IN
55.
True or false. DAC0808 is the same as DAC1408.
Describe the difference between resolution and accuracy of a DAC.
Compare the difference between improving DAC resolution and improving DAC accuracy.
Explanation / Answer
In DAC input is digital output is analog
In ADC input is analog output is digital
The output of DAC0808 is in voltage
The output of DAC0808 is ideal to drive a motor. its false its output is just 1 or 2 volts
DAC0808 is a(n) 8-bit D-to-A converter.
signal conditioning means manipulating an analogsignal in such a way that it meets the requirements of the next stage for further processing. Most common use is in analog-to-digital converters.
True or false. DAC0808 is the same as DAC1408. its true
Compare the difference between improving DAC resolution and improving DAC accuracy.
Electronic systems operating in harsh environments may have to endure large temperature extremes while maintaining their accuracy and stability. Such systems often require multiple digital-to-analog converters with resolutions up to 16 bits. The accuracy of the DAC output voltage ultimately depends on the accuracy of its reference voltage. Usually, for this level of performance over temperature, a separate precision reference would be used. Now, however, a new precision quad DAC family includes a low-drift voltage reference with performance good enough to serve as a system reference.
The voltage reference should maintain a constant voltage independent of load, power supply variation, and temperature. Unfortunately, high-performance standalone voltage references are often large, costly, and power hungryand on-chip references often have poor performance.
Until now, faced with the choice of pairing an accurate DAC with an external reference or suffering with a low-performance on-chip reference, system designers were often forced to choose the DAC, plus external reference. They couldnt rely on the performance of the on-chip reference, as its large variation over temperature and frequent lack of a maximum TC specification didnt allow its use as a system reference.
Describe the difference between resolution and accuracy of a DAC.
In electronics, a digital-to-analog converter (DAC or D-to-A) is a device for converting a digital (usually binary) code to an analog signal (current, voltage or electric charge).
An analog-to-digital converter (ADC) performs the reverse operation.
CD's store bits - that is 1's and 0's. Your CD player will read the CD and then convert the digital information to analog information that you will then feed to an amplifier or pre-amplifier. This is a critical process that needs to be done very well in order for enjoyable, fatigue free sound.
Most CD players will only make a half-hearted effort at the Digital-to-Analog conversion process, relying on OEM converter chipset's and less than adequate amplification stages. These will usually share the same power supply as that of the CD mechanism, which itself is very demanding on power because of the constant feedback mechanisms involved in the read-back process.
Many audiophiles will go for a two-box alternative. The first box being a CD transport (or CD player being used as a transport) which, in turn, feeds into a DAC. The DAC then converts the digital signal into an analog one; producing the line-level output that can be fed into a pre-amplifier or integrated amplifier.
Most dedicated CD players will have a digital output on them as well as the analog output. If you connect the digital output of your CD player to a DAC then you will bypass the CD player's "internal DAC" (digital-to-analog portion of your CD player) and the external DAC will then be responsible for the conversion process.
This is an extremely effective way of upgrading a CD-based hi-fi system and can make an extreme impact on the quality of playback. Later, you can then consider whether or not to upgrade your CD player to a dedicated CD transport. It is even possible to use a computer as a transport by use of a USB interface between the computer and DAC (such an option exists for our DAC Kit 2.1 in the form of an internal add-on board) and appropriate software.
Our DAC kits are based on the experience gained from Audio Note's many years of producing DAC's. They produce some of the most highly rated of all DAC's on the market today and have some unique and novel methods of handling the many aspects of the digital-to-analog process - many of which we can pass on to you through our DAC kits.
Instead of blindly accepting all of the then-current theory and dictate from the early pioneers of the technology as most manufacturers did (and still do) one company, Audio Note( This is a great DIY site for audiophile components), decided to do their own research into how the DAC process should be achieved (they were already experts in handling the eventual Analog portion). They found that simplicity and careful design at each stage of the process was the best way to go. Their resulting approach was, at the time, very controversial and upset many deeply held beliefs in the design world. Today, however, more and more manufacturers are beginning to use some of Audio Note's methods in their own designs and Audio Note are still at the forefront of DAC design.
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