STA321 datasheet(154/157 Pages) STMICROELECTRONICS

154 / 157 page

Glossary

STA321

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Doc ID 15351 Rev 3

Glossary

Total harmonic distortion + noise (THDN)

The ratio of the RMS value of all the spectral components in the specified band (20 Hz -

20 kHz) to the RMS values of the signal fundamental component. THDN is measured at

0 dBfs input at a frequency of 1 kHz.

Signal to noise plus distortion ratio (SNDR)

Ratio between power of signal fundamental component and “noise+distortion”. It is

measured at different input levels: 0 dBfs, -3 dBfs, -6 dBfs, -10 dBfs, -20 dBfs, -40 dBfs,

-60 dBfs. When the signal amplitude is less than 0 dBfs, that much dB is added to obtain the

final SNR. For example, if SNDR is 87 dB with -6dBfs signal, then SNR = 87 + 6 = 93 dB.

Dynamic range (DR)

Dynamic range is measured using SNDR at -60 dBfs, 1 kHz signal and adding 60 dB. For

example, if SNDR with -60 dBfs is 38 dB then the dynamic range is 38 + 60 = 98 dB.

Crosstalk

Crosstalk is the measure of the inter-channel isolation between the left and right channels of

a stereo system. It is measured at each output with zero input to the channel under test and

a full-scale input applied to the other channel.

Deviation from linear phase

Measurement bandwidth 20 Hz to 20 kHz, fS = 48 kHz. The measurement takes into

account the combined digital and analog filter characteristics.

Pass band, pass-band ripple, stop band, stop-band attenuation

These parameters take into account both analog and digital filter characteristics. Stop-band

attenuation should be measured between 0.55 * fS and 3.45 * fS.

STA321 数据表(PDF) 154 Page - STMicroelectronics