WM8850 View Datasheet(PDF) - Wolfson Microelectronics plc

Part Name

Description

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WM8850

Multi-Channel High Definition Audio CODEC

Wolfson Microelectronics plc 

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WM8850

STEREO HEADPHONE PLAYBACK

Stereo headphone playback is supported using the VOUT1L and VOUT1R pins; these provide a

ground-referenced stereo output through the DAC1 node. This output is intended for headphones,

but can be used as a single-ended line output if required. This path can provide two channels of a

multi-channel playback system, operating alongside the other two DAC paths.

It is possible to configure the stereo headphone outputs to select the S/PDIF Rx node as the data

source. This signal path is enabled using a vendor-specific verb, and is illustrated by the dotted line in

Figure 11.

The WM8850 nodes associated with this function are shown in Figure 11.

from S/PDIF Rx

06h

DAC1

11h

Port-A

VOUT1L

VOUT1R

Figure 11 Stereo Headphone Playback Path

This section provides a summary of the DAC1 and Port-A, and describes the vendor-specific verb

functions associated with each.

DAC1 (NID = 06H)

Table 20 gives a summary of the DAC1 node:

NODE SUMMARY INFORMATION

NID

06h

Widget Type

Audio Converter

Supported Get Verbs

Ah, Bh, F00h, F05h, F06h, F08h, F73h, F8Eh

Supported Set Verbs

2h, 3h, 705h, 706h, 708h, 773h, 78Eh

Unsolicited Responses

Stream Error

Vendor-Specific Verbs

F73h, 773h : Internal Path Verb

F8Eh, 78Eh : Unsolicited Response Priority Control Verb

Table 20 DAC1 Node Summary Information

DAC1 is a high performance stereo DAC that supports all common sample rates from 8kHz to

192kHz and data widths of 16, 20, 24 and 32-bit (Float-32).

The sample rate and word length of the data played back by the DAC1 node is set using the Stream

Format Verb. Table 9 below shows the required settings for Base, Mult and Div as part of the Stream

Format Verb to obtain the required sample rate.

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PP, April 2011, Rev 3.2

51

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