Cirrus Logic CS4398 - Manual (Page 39)

DS568F1 39
CS4398
8. PARAMETER DEFINITIONS
Total Harmonic Distortion + Noise (THD+N)
THD+N is 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 mea-
surement technique has been accepted by the Audio Engineering Society, AES17-1991, and the Electronic Indus-
tries 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.
9. REFERENCES
1. CDB4398 Evaluation Board Datasheet
2. “Design Notes for a 2-Pole Filter with Differential Input”. Cirrus Logic Application Note AN48
3. The I²C-Bus Specification: Version 2.0” Philips Semiconductors, December 1998.
http://www.semiconductors.philips.com “