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#1
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AD9218, what will the negative values be in binary mode?
When my DAC output is from 0-1V, and is fed into 10-bit AD9218 which
is set to binary mode, what binary value will I get when the input is -10mV? |
#2
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AD9218, what will the negative values be in binary mode?
I assume you mean -10mV AC coupled into the AD9218 (it is internally
biased at 1/3Vdd) You would have 1/200 of the negative dynamic range, or 1/100 of the span range which gives -10/1024. As the output is set for 2s complement, the output will run from +511 to -512 (Hex = 0x1FF at +511 to 0x200 at -512) for an input of 1Vp-p, so in this case, you should get 3F6, rounded to the nearest integer. (-10 decimal) Cheers PeteS |
#3
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AD9218, what will the negative values be in binary mode?
further to my other reply, if you are using offset binary, then you
will get N[off] - 10 (decimal). The output of the DAC at Vin(centre) should be 0x200, so you would get 1F6. Cheers PeteS |
#4
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AD9218, what will the negative values be in binary mode?
On 28 Nov 2005, Frank put down his happy meal and blurted:
When my DAC output is from 0-1V, and is fed into 10-bit AD9218 which is set to binary mode, what binary value will I get when the input is -10mV? I'm lovin' it. |
#5
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AD9218, what will the negative values be in binary mode?
Thank you Peter.
My digital output is from 0-1024 (1MHz sine wave 0 - -1, 1024 - +1) and fed into the 10 MSBs of DAC (TI DAC290x-EVM). Due to noise, the DAC has some below zero values on oscilloscope (-20mV ~ 0.8V). When I connected this signal to ADC, how do I ensure that the digital output is the same (or nearly the same) value of my original digital input? (The requirement is such that after I captured the ADC O/P with logic analyzer, plotted in graph of 0~1024, it shows a sine wave without bad codes). "PeteS" wrote in message oups.com... further to my other reply, if you are using offset binary, then you will get N[off] - 10 (decimal). The output of the DAC at Vin(centre) should be 0x200, so you would get 1F6. Cheers PeteS |
#6
Posted to alt.electronics,comp.arch.embedded,comp.arch.fpga,comp.dsp
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AD9218, what will the negative values be in binary mode?
Frank wrote:
When my DAC output is from 0-1V, and is fed into 10-bit AD9218 which is set to binary mode, what binary value will I get when the input is -10mV? If your DAC is really set to produce outputs from 0-1V, any apparent negative voltages are necessarily analog noise. This isn't a question about bit values. There are straight binary, offset binary, and two's-complement binary. If you want details, point me to relevant data sheets. Jerry -- Engineering is the art of making what you want from things you can get. ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ |
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