WM8850 datasheet(55/223 Pages) WOLFSON

55 / 223 page

Pre-Production

WM8850

PP, April 2011, Rev 3.2

DAC2 and DAC3 are a high performance stereo DACs 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 DAC2 or DAC3 nodes is set using

the Stream Format Verb. Table 24 below shows the required settings for Base, Mult and Div as part

of the Stream Format Verb to obtain the required sample rate.

SAMPLE RATE

BASE

MULT

DIV

8kHz

11.025kHz

16kHz

22.05kHz

24kHz

32kHz

44.1kHz

48kHz

88.2kHz

96kHz

176.4kHz

192kHz

Table 24 DAC2 and DAC3 Supported Sample Rate Settings

Note: Other settings of Base, Mult and Div are reserved and should not be set.

DAC2 and DAC3 provide digital gain, allowing the signal level to be adjusted between 0dB and

−63.5dB in 0.5dB steps. Gain can be applied to left and right channels independently if required.

Additionally, a digital softmute function is available – again this can be applied to separate channels

as required. The gain of each DAC is controlled using the Amplifier Gain/Mute Verb in the required

node.

Under default conditions, the DAC2 and DAC3 nodes will process data received from the HDA

interface. It is also possible to select S/PDIF Rx as the data source, using the vendor-specific Internal

Path Verb.

Note that, when the S/PDIF Rx node is selected as the input to any of DAC1, DAC2 or DAC3, the

Internal Path Verbs in all the other DAC nodes are updated to use the S/PDIF Rx node also. It is not

possible to route the HDA Link to any DAC at the same time as routing the S/PDIF Rx node to

another DAC.

When the S/PDIF Rx node is selected as the input to the DAC nodes, the Stream Format Verb for

each DAC node becomes read-only and is set according to the settings in the S/PDIF Rx node.

SET VERB

BIT

BITFIELD

NAME

DEFAULT

DESCRIPTION

773h

7:0

Path Sel

00h

Selects source of DAC2 or DAC3 node:

00h = DAC takes data from HDA Link

05h = DAC takes data from S/PDIF Rx

All other values of Path Sel are reserved.

Note: When using the Internal Path Verb to use S/PDIF Rx as the data source of DAC2 or DAC3 it is

recommended that the S/PDIF Rx node (NID=05h) is enabled after setting Path Sel=05h. Failure to

do so may result in a one sample delay between left and right channels.

WM8850 Datasheet(PDF) 55 Page - Wolfson Microelectronics plc

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