CDB6403 查看數據表（PDF） - Cirrus Logic

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CDB6403

Echo-Cancelling Codec

Cirrus Logic 

CS6403

PARAMETER DEFINITION

Anti-Alias Rejection

The rejection of input frequencies in the frequency range >Fs/2 of all multiples of the input

sample rate (64 x Fs). This rejection is almost solely dependent on the external input RC.

Audible (<20kHz) Noise

The DAC audible noise floor. Measured by applying a -60dB, 1kHz sine wave. S/(N+D) is

then measured (over a Fs/2 to 20kHz bandwidth). Then add 60dB to the answer, to compensate

for the -60dB signal level.

Convergence

The process by which an echo canceller improves its path estimate, thereby improving its echo

return-loss enhancement. Convergence is complete once the echo return-loss enhancement

reaches its best value for a given environment.

Differential Nonlinearity

The worst case deviation from the ideal codewidth. Units in LSB.

ERLE

Echo signal-power reduction (Echo Return-Loss Enhancement) provided by an echo canceller.

Maximum ERLE for an echo canceller is dependent on training-signal statistics and echo-path

attributes. Units in dB.

Frequency Response

Worst case variation in output signal level versus frequency over the passband (20Hz to

0.45Fs), referenced to the level at 1kHz. 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.

Integrated Inaudible (>20kHz) Energy

The integrated signal level on the analog output pin after a 20kHz hi-pass filter. Zero digital

input into the DAC. Units in mVrms.

Offset Error

For the ADC, the deviation of the output code from the mid-scale with the selected input at

VCM. For the DAC, the deviation of the output from VCM with mid-scale input code. Units

in LSB’s for the ADC and millivolts for the DAC.

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DS192PP6

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