CSR8635 查看數據表（PDF） - CSR plc

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CSR8635

The CSR8635 QFN single-chip Bluetooth® audio ROM device targets mid-range stereo speakers and headsets.

CSR plc 

9 Audio Interface

The audio interface circuit consists of:

■ Stereo/dual-mono audio codec

■ Dual analogue audio inputs

■ Dual analogue audio outputs

■ Configurable PCM (PCM1) and I²S interfaces, for configuration information contact CSR

Figure 9.1 shows the functional blocks of the interface. The codec supports stereo/dual-mono playback and recording

of audio signals at multiple sample rates with a 16-bit resolution. The ADC and the DAC of the codec each contain 2

independent high-quality channels. Any ADC or DAC channel runs at its own independent sample rate.

Stereo / Dual-mono Codec

mber 27, 2013 Memory

te Management

p Unit

MMU Voice Port

Voice Port

PCM1

Digital

Audio

PCM1 Interface

.cn - Friday, Se Register Interface

Registers

Stereo

Audio

Codec

Driver

2 x Differential

DAC Outputs

2 x Differential

ADC Inputs

int.com Figure 9.1: Audio Interface

lpo The interface for the digital audio bus shares the same pins as the PCM1 codec interface described in Section 9.3.

xce Table 9.1 lists the alternative functions.

- e Important Note:

.zhou The term PCM in Section 9.3 and its subsections refers to the PCM1 interface.

even PCM Interface

gbo k PCM_OUT

for qinPCM_IN

ared PCM_SYNC

Prep PCM_CLK

I²S Interface

SD_OUT

SD_IN

WS

SCK

Table 9.1: Alternative Functions of the Digital Audio Bus Interface on the PCM1 Interface

9.1 Audio Input and Output

The audio input circuitry consists of 2 independent 16-bit high-quality ADC channels:

■ Programmable as either stereo or dual-mono inputs

■ 1 input programmable as either microphone or line input, the other as line input only

■ Each channel is independently configurable to be either single-ended or fully differential

■ Each channel has an analogue and digital programmable gain stage, this also aids optimisation of different

microphones

The audio output circuitry consists of a dual differential class A-B output stage.

Production Information

© Cambridge Silicon Radio Limited 2013

Confidential Information - This Material is Subject to CSR's Non-disclosure Agreement

Page 37 of 105

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