3rd order archit.

What means 3rd order architecture and dBA short? It's from codec
AIC23's manual:

"The ADC sigma-delta modulator features
third-order multibit architecture with up to 90-dBA signal-to-noise
ratio (SNR) at audio sampling rates up to 96 kHz,
enabling high-fidelity audio recording in a compact, power-saving
design. The DAC sigma-delta modulator features
a second-order multibit architecture with up to 100-dBA SNR at audio
sampling rates up to 96 kHz, enabling
high-quality digital audio-playback capability, while consuming less
than 23 mW during playback only." Start a New Thread

Nazwa-

> What means 3rd order architecture and dBA short? It's from codec
> AIC23's manual:
>
> "The ADC sigma-delta modulator features
> third-order multibit architecture with up to 90-dBA signal-to-noise
> ratio (SNR) at audio sampling rates up to 96 kHz,
> enabling high-fidelity audio recording in a compact, power-saving
> design. The DAC sigma-delta modulator features
> a second-order multibit architecture with up to 100-dBA SNR at audio
> sampling rates up to 96 kHz, enabling
> high-quality digital audio-playback capability, while consuming less
> than 23 mW during playback only."

Here are a couple of links that should help explain:

http://www.analog.com/en/content/0,2886,760%255F788%255F92394,00.html

http://metrology.hut.fi/courses/s108-180/Luento9/sd.pdf

Order has to do with number of summing + integrator stages. Multi-bit architectures
use a Flash ADC and a N-bit DAC instead of a 1-bit comparator. dBA is A-weighted dB
measurement; search for A-weighting.

-Jeff Start a New Thread