CS4294SLASHCS4298 datasheet(62/66 Pages) CIRRUS

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CS4202

DS549PP2

13. PARAMETER AND TERM DEFINITIONS

AC ’97 Specification

Refers to the Audio Codec ’97 Component Specification Ver 2.2 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 CS4202. “ADCs” refers to the stereo pair of

Analog-to-Digital converters. The CS4202 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

CS4202.

DAC

Refers to a single Digital-to-Analog converter in the CS4202. “DACs” refers to the stereo pair of

Digital-to-Analog converters. The CS4202 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.

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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