XE3005 查看數據表（PDF） - Unspecified

零件编号

产品描述 (功能)

比赛名单

XE3005

Low-Power Audio CODEC

Unspecified 

Data Sheet

XE3005/XE3006

2 Functional Description

A CODEC is typically used for voice and audio applications as an interface between a Digital Signal processor

(DSP) or microcontroller and the analogue interfaces like a microphone and loudspeaker.

ADC

DAC

MIC-Amplifier

CODEC

Serial Audio Interface

Power Amplifier

SPI

DSP / Microcontroller

„ Digital wireless transmission – Bluetooth™

„ Voice recognition / speech synthesis

Figure 2: typical usage of CODEC

This chapter provides a brief description of the CODEC features relating to the CODEC configuration. The

configuration of the CODEC is defined by programming registers through a serial interface. A detailed description

of the registers defining details of the CODEC setup can be found in chapter 3 and 7. Digital voice and audio

samples are passed through the Serial Audio Interface.

2.1 Device Functions

2.1.1 ADC Signal Channel

The ADC channel is a chain of programmable amplifier, band-pass filter, sigma-delta modulator and a decimation

filter. The amplifier gain is programmable to 5x (default) and 20x. The band-pass filter has cut-off frequencies

proportional to the sampling rate. The sigma-delta modulator operates at a frequency of 64 times the sampling

rate. The analog modulator is followed by a digital decimation filter. The digital output data (16 bits, 2’s

complement format) is made available through the Serial Audio Interface. The format of the Serial Audio interface

can be selected through register J.

With the default register settings the ADC can run at a sampling frequency up to 20 kHz. When used with a

sampling frequency higher than 20 kHz, then register C has to be changed.

The whole ADC chain can be powered-down through register I.

4

D0212-116

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