CS4297 Datasheet, PDF (11/46 Pages) Cirrus Logic – CrystalClear SoundFusion Audio Codec 97

CS4297
CrystalClear™ SoundFusion™ Audio Codec ’97
Frequency Response (FR)
FR is the deviation in signal level verses frequency. The 0 dB reference point is 1 kHz. The
amplitude corner, 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 maximum frequency inclusive.
Dynamic Range (DR)
DR is the ratio of the RMS full-scale signal level divided by the RMS sum of the noise floor,
in the presence of a signal, available at any instant in time (no change in gain settings between
measurements). Measured over a 20 Hz to 20 kHz bandwidth with units in dB FS A.
Total Harmonic Distortion plus Noise (THD+N)
THD+N is the ratio of the RMS sum of all non-fundamental frequency components, divided by
the RMS full-scale signal level. It is tested using a -3 dB FS input signal and is measured over
a 20 Hz to 20 kHz bandwidth with units in dB FS A.
Signal to Noise Ratio (SNR)
SNR, similar to DR, is the ratio of an arbitrary sinusoidal input signal to the RMS sum of the
noise floor, in the presence of a signal. It is measured over a 20 Hz to 20 kHz bandwidth with
units in dB.
Interchannel Isolation
The amount of 1 kHz signal present on the output of the grounded AC-coupled line input
channel with 1 kHz 0 dB signal present on the other line input channel. Units in dB.
Interchannel Gain Mismatch
For the ADCs, the difference in input voltage to get and equal code on both channels. For the
DACs, the difference in output voltages for each channel when both channels are fed the same
code. Units in dB.
PATHS: [4]
A-D: Analog in, through the ADC, onto the serial link.
D-A: Serial interface inputs through the DAC to the analog output
A-A: Analog in to Analog out (analog mixer)
DS242F5
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