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ADC vocabulary questionby david90
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#1
Mar1212, 03:09 AM

P: 303

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? 


#2
Mar1212, 06:02 AM

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PF Gold
P: 2,595

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 2^{8} = 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 


#3
Mar1212, 07:55 AM

Sci Advisor
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PF Gold
P: 12,126

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


#4
Mar1212, 10:10 AM

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P: 3,634

ADC vocabulary question
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. 


#5
Mar1212, 10:15 AM

Sci Advisor
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PF Gold
P: 12,126

And BCD was popular, too.
Jim  your eyes are beginning to mist over again. . . . 


#6
Mar1212, 02:39 PM

P: 561

Digitized Signal



#7
Mar1212, 06:08 PM

Sci Advisor
PF Gold
P: 3,634

You know, they just don't make nostalgia like they used to. old jim 


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