Cirrus Logic CS4349 - Manual (Page 37)

DS782F2 37
CS4349
10 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 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.
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 Drift
The change in gain value with temperature. Units in ppm/°C.
Intrachannel Phase Deviation
The deviation from linear phase within a given channel.
Interchannel Phase Deviation
The difference in phase between channels.
0 0.05 0.1 0.15 0.2 0.25 0.3
−0.5
−0.4
−0.3
−0.2
−0.1
0
0.1
0.2
0.3
0.4
0.5
Frequency (normalized to Fs)
Amplitude (dB)
0 0.05 0.1 0.15 0.2 0.25 0.3
−0.5
−0.4
−0.3
−0.2
−0.1
0
0.1
0.2
0.3
0.4
0.5
Frequency (normalized to Fs)
Amplitude (dB)
Figure 28. Quad-Speed (Fast) Passband Detail Figure 29. Quad-Speed (Slow) Passband Detail