CS4237B Datasheet, PDF (108/114 Pages) Cirrus Logic – CrystalClear Advanced Audio System with 3D Sound

CS4237B
PARAMETER DEFINITIONS
Resolution
The number of bits in the input words to the DACs, and in the output words in the ADCs.
Differential Nonlinearity
The worst case deviation from the ideal code width. Units in LSB.
Total Dynamic Range
TDR is the ratio of the RMS value of a full scale signal to the lowest obtainable noise floor. It
is measured by comparing a full scale signal to the lowest noise floor possible in the codec (i.e.
attenuation bits for the DACs at full attenuation). Units in dB.
Instantaneous Dynamic Range
IDR is the ratio of a full-scale RMS signal to the RMS noise available at any instant in time,
without changing the input gain or output attenuation settings. It is measured using S/(N+D)
with a 1 kHz, -60 dB input signal, with 60 dB added to compensate for the small input signal.
Use of a small input signal reduces the harmonic distortion components to insignificance when
compared to the noise. Units in dB.
Total Harmonic Distortion (THD)
THD is the ratio of the test signal amplitude to the RMS sum of all the in-band harmonics of
the test signal. THD is measured using an input signal which is 3dB below typical full-scale,
and referenced to typical full scale.
Interchannel Isolation
The amount of 1 kHz signal present on the output of the grounded input channel with 1 kHz
0 dB signal present on the other channel. Units in dB.
Interchannel Gain Mismatch
For the ADCs, the difference in input voltage that generates the full scale code for each
channel. For the DACs, the difference in output voltages for each channel with a full scale
digital input. Units in dB.
Offset Error
For the ADCs, the deviation in LSBs of the output from mid-scale with the selected input
grounded. For the DACs, the deviation in volts of the output from VREF with mid-scale input
code.
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