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ADC vocabulary question

by david90
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david90
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Mar12-12, 03:09 AM
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what do you call the digital number that analog to digital converters output ?

Does it make any sense to call it "analog signal's digital representation" ? Is there a better way to call it?
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davenn
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Mar12-12, 06:02 AM
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Quote Quote by david90 View Post
what do you call the digital number that analog to digital converters output ?

Does it make any sense to call it "analog signal's digital representation" ? Is there a better way to call it?
Its called a binary output

the number of bits, from the LSB (Least Significant Bit to the MSB Most Significant Bit) that binary code has for each sample is a function of the design of the ADC chip ie. whether its a for example a 8 bit, 16 bit or say 24bit system.
the more bits the higher the resolution and the larger the input signal it can handle befor it clips. For example, an ADC with a resolution of 8 bits can encode an analog input to one in 256 different levels, since 28 = 256.

Initially my digital seismograph system used 12bit resolution (4094 datapoints) and it would often clip on the large signals from the big earthquakes. I upgraded the ADC system to a 16bit one now I have 65536 datapoints.

hope that waffle helped :)

Dave
sophiecentaur
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Mar12-12, 07:55 AM
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Quote Quote by davenn View Post
Its called a binary output


Dave
It doesn't need to be binary. The general term would be 'digital' or even 'quantised' output.

The term "representation" is a good one because it gets over the idea that it's information that's involved.

jim hardy
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Mar12-12, 10:10 AM
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ADC vocabulary question

The term "representation" is a good one because it gets over the idea that it's information that's involved.
Indeed, while one will most often encounter a binary representation it may be in any of several formats.
Once ran across one that gave result as an ASCII character string representing the millivolts, complete with decimal point .

Never saw one that gave Roman Numerals, though.
sophiecentaur
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Mar12-12, 10:15 AM
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And BCD was popular, too.
Jim - your eyes are beginning to mist over again. . . .
Windadct
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Mar12-12, 02:39 PM
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Digitized Signal
jim hardy
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Mar12-12, 06:08 PM
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Jim - your eyes are beginning to mist over again. . .
.

You know, they just don't make nostalgia like they used to.
old jim
davenn
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Mar13-12, 06:49 PM
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Quote Quote by jim hardy View Post
Indeed, while one will most often encounter a binary representation it may be in any of several formats.
Once ran across one that gave result as an ASCII character string representing the millivolts, complete with decimal point .
.......
ASCII never come across one with an ASCII output

we learn every day :)

Dave


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