CS47048 Data Sheet

Audio SOC Processor Family

DS787A7

Copyright 2008 Cirrus Logic

33

10. Parameter Definitions

10.1 Dynamic Range

The ratio of the 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 ratio measurement over the specified

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

measurement to full-scale. This technique ensures that the distortion components are below the

noise level and do not affect the measurement. This measurement technique has been accepted

by the Audio Engineering Society, AES17-1991, and the Electronic Industries Association of

Japan, EIAJ CP-307. Expressed in decibels.

10.2 Total Harmonic Distortion + Noise

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. Measured at -1 and -20 dBFS as suggested in AES17-1991 Annex A.

10.3 Frequency Response

A measure of the amplitude response variation from 10 Hz to 20 kHz relative to the amplitude

response at 1 kHz. Units in decibels.

10.4 Interchannel Isolation

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

converter's output with no signal to the input under test and a full-scale signal applied to the other

channel. Units in decibels.

10.5 Interchannel Gain Mismatch

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

10.6 Gain Error

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

10.7 Gain Drift

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

11. Revision History

Revision

Date

Changes

A7

October 16, 2008

Initial Release