Application Note for audio codec terminology

lj52463

Hello all,

Does anyone know if there TI has an application note that explains the terminology for audio codec datasheets? For example, is there a app note that explains what the terms full scale input voltage, dynamic range, mic inputs (10dB = 0, 20 dB = 0), etc. mean?

Thanks for your help.

over 15 years ago

0 Jonathan9420 over 15 years ago

Expert 2056 points

I'd like to know this, too.

Wolfson has published definitions:

Dynamic range (dB) - DNR [or DR] is a measure of the difference between the highest and lowest portions of a signal. Normally a THD+N measurement at 60dB below full scale. The measured signal is then corrected by adding the 60dB to it. (e.g. THD+N @ -60dB= -32dB, DR= 92dB).

Cirrus Logic, too:

Signal-to-Noise Ratio (Dynamic Range) - Ratio of the rms magnitude of the full-scale signal to the integrated rms noise from DC to 430 Hz. The following formula is used to calculate SNR: SNR = 20log (rms magnitude of full scale signal / rms magnitude of noise floor)

But I can't find TI's definition or measurement procedure.

Similar thread: http://e2e.ti.com/support/applications/audio/f/22/t/50667.aspx