Cirrus-logic CS43122 Manuel d'utilisateur télécharger pdf (Page 25)

CS43122

7. PARAMETER DEFINITIONS

Total Harmonic Distortion + Noise (THD+N)

The ratio of the rms value of the signal to the rms sum of all other spectral components over the specified

bandwidth (typically 10 Hz to 20 kHz), including distortion components. Expressed in decibels.

Dynamic Range

The ratio of the full scale rms value of the signal to the rms sum of all other spectral components over the

specified bandwidth. Dynamic range is a signal-to-noise measurement over the specified bandwidth

made with a -60 dBFS signal. 60 dB is then added to the resulting measurement to refer the measurement

to full scale. This technique ensures that the distortion components are below the noise level and do not

effect the measurement. This measurement technique has been accepted by the Audio Engineering So-

ciety, AES17-1991, and the Electronic Industries Association of Japan, EIAJ CP-307.

Interchannel Isolation

A measure of crosstalk between the left and right channels. Measured for each channel at the converter’s

output with all zeros to the input under test and a full-scale signal applied to the other channel. Units in

decibels.

Interchannel Gain Mismatch

The gain difference between left and right channels. Units in decibels.

Gain Error

The deviation from the nominal full scale analog output for a full scale digital input.

Gain Drift

The change in gain value with temperature. Units in ppm/°C.

8. REFERENCES

1) "How to Achieve Optimum Performance from Delta-Sigma A/D & D/A Converters" by Steven Harris.

Paper presented at the 93rd Convention of the Audio Engineering Society, October 1992.

2) CDB43122 Evaluation Board Datasheet

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Cirrus-logic CS43122 Manuel d'utilisateur Page 25