ALC892 데이터 시트보기 (PDF) - Realtek Semiconductor

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ALC892

7.1+2 CHANNEL HD AUDIO CODEC WITH CONTENT PROTECTION

Realtek Semiconductor 

ALC892

Datasheet

11.2. Digital Microphone Implementation

This section describes the ALC892 digital microphone implementation. There is one Clock output pin

and 1 Data input pin in the ALC892. The ALC892 provides the clock signal to the digital microphone.

When the digital microphone receives the external sound input, it converts the analog signals to digital in

a 1-bit format. The 1-bit data is delivered to the codec though the data input pin. The Digital Filter in the

audio codec converts the 1-bit data stream into Pulse Code Modulation (PCM) data. The PCM data is sent

to the HDA controller through the HDA link.

Figure 22. Digital Microphone Implementation

The ALC892 supports a two-wire interface for the digital microphone and operates in single-channel

(mono type) or stereo-channel mode. One pin is clock output to the digital microphone, and the other is a

serial pin. The default clock output is 2.048MHz.

The ALC892 uses one data pin to support stereo inputs from various digital microphones and microphone

module. Popular digital microphones provided from Fortemedia, Akustica, Knowles, and Hosiden are

supported. Please contact Realtek and your digital microphone vendor to get the best compatibility

between the ALC892 and various digital microphones.

Figure 23. Stereo Digital Microphone Connection

7.1+2 Channel HD Audio Codec with Content Protection 80

Track ID: JATR-2265-11 Rev. 1.3

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