sigma delta converter output

[SwordFish]

sigma delta output

Hi,
I want to know what kind of data is on output of a sigma-delta converter.
I know that after the modulator data si coded PWM (Pulse Weight Modulation) . After that the 1bit stream enter in a decinator tahi is in many cases a low-pass FIR filter. At the output we have a 16bit data.
I want to know is this data is serial or paralel and in what code? PWM or binary ???
After that I need a PWM -> binary converter ????

I read a book about Sigma-Delta (by Temes) but I didn't find any of that.

please help me someone who worked with that.

THX

SwordFish

 

[bear7679]

Re: sigma delta output

Most IC use serial output in 2's compliment format.

 

[avinash]

Re: sigma delta output

i think bear is right.data is serial output word rate of 16 bit

 

[brmadhukar]

Re: sigma delta output

Hi,
Normally the data is binary. Esp if you are using the SD for ADC applications it needs to mimic a normal ADC output. So you may assume that it is as good as a normal ADC with possibly better resolution.
Since there are digital circuits involved, you may generate any formt output if you are designing the sigma delta.
B R M

 

[Tipu]

Re: sigma delta output


Ya the output is normally in binary and it is serial output

 

[bless_fooling]

sigma delta output

the sigma delta modulator ADC's output isusually in binary and it is serial output, then use a decimation filter to down sampling and remove the image folding issue.