CS4525 datasheet(88/91 Pages) CIRRUS

88 / 91 page

DS726A1

CS4525

10.PARAMETER DEFINITIONS

Dynamic Range (DYR)

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

bandwidth, typically 20 Hz to 20 kHz. Dynamic Range is a signal-to-noise ratio measurement over the spec-

ified band width 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 Society, AES17-1991, and the Electronic Industries Association of Japan, EIAJ CP-307. Ex-

pressed in decibels.

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

band width (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.

Frequency Response

FR is the deviation in signal level verses frequency. The 0 dB reference point is 1 kHz. The amplitude cor-

ner, Ac, lists the maximum deviation in amplitude above and below the 1 kHz reference point. The listed

minimum and maximum frequencies are guaranteed to be within the Ac from minimum frequency to maxi-

mum frequency inclusive.

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 deci-

bels.

Interchannel Gain Mismatch

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

Gain Drift

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

Sampling Frequency.

Resolution

The number of bits in a serial audio data word.

SRC

Sample Rate Converter. Converts data derived at one sample rate to a differing sample rate.

11.REFERENCES

Cirrus Logic, “AN18: Layout and Design Rules for Data Converters and Other Mixed Signal Devices,”

Version 6.0, February 1998.

Cirrus Logic, “AN22: Overview of Digital Audio Interface Data Structures, Version 2.0”, February 1998.; A

useful tutorial on digital audio specifications.

Philips Semiconductor, “The I²C-Bus Specification: Version 2,” Dec. 1998.

http://www.semiconductors.philips.com

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