CS4297A
CS4297A
10. PARAMETER AND TERM DEFINITIONS
AC ’97 Specification
Refers to the Audio Codec ’97 Component Specification Ver 2.1 published by the Intel® Corporation [6].
AC ’97 Controller or Controller
Refers to the control chip which interfaces to the audio codec AC-link. This has been also called DC ’97
for Digital Controller ’97 [6].
AC ’97 Registers or Codec Registers
Refers to the 64-field register map defined in the AC ’97 Specification.
ADC
Refers to a single Analog-to-Digital converter in the CS4297A. “ADCs” refers to the stereo pair of
Analog-to-Digital converters. The CS4297A ADCs have 18-bit resolution.
Codec
Refers to the chip containing the ADCs, DACs, and analog mixer. In this data sheet, the codec is the
CS4297A.
DAC
Refers to a single Digital-to-Analog converter in the CS4297A. “DACs” refers to the stereo pair of
Digital-to-Analog converters. The CS4297A DACs have 20-bit resolution.
dB FS A
dB FS is defined as dB relative to full-scale. The “A” indicates an A weighting filter was used.
Differential Nonlinearity
The worst case deviation from the ideal code width. Units in LSB.
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.
FFT
Fast Fourier Transform.
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.
Fs
Sampling Frequency.
Interchannel Gain Mismatch
For the ADCs, the difference in input voltage to get an 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 are in
dB.
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DS318PP6
CIRRUS [ CIRRUS LOGIC ]
