WM8850 datasheet(39/223 Pages) WOLFSON

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Pre-Production

WM8850

PP, April 2011, Rev 3.2

STEREO ANALOGUE LINE RECORD

Stereo analogue line input is supported using the VIN1LP, VIN1LN, VIN1RP and VIN1RN pins; these

are available for high-quality stereo digitisation through the ADC1 node.

The WM8850 nodes associated with this function are shown in Figure 5.

Figure 5 Stereo Analogue Line Record Path

This section provides a summary of the Port-E, PGA1 and ADC1 nodes, and describes the vendor-

specific verb functions associated with each.

PORT-E (NID = 0CH)

Table 6 gives a summary of the Port-E node:

NODE SUMMARY INFORMATION

NID

0Ch

Widget Type

Pin Complex

Supported Get Verbs

F00h, F07h, F08h, F09h, F0Ch, F1Ch, F8Eh, FB0h

Supported Set Verbs

707h, 708h, 70Ch, 71Ch, 71Dh, 71Eh, 71Fh, 78Eh, 7B0h

Unsolicited Responses

Presence Detect Status Change

Vendor-Specific Verbs

F8Eh, 78Eh : Unsolicited Response Priority Control Verb

FB0h, 7B0h : Auto-Mute Control Verb

Table 6 Port-E Node Summary Information

Port-E supports two different input configurations, controlled by the EAPD/BTL Verb.

SET VERB

BIT

BITFIELD

NAME

DEFAULT

DESCRIPTION

70Ch

BTL

Controls the configuration of the input pins on

Port-E:

0 = Single-ended mode

1 = BTL (balanced) mode

In single-ended input mode, VIN1LP and VIN1RP are used as the Port-E input pins VIN1LN and

VIN1RN must be left floating in this mode. Note that the full-scale input signal level is reduced in

single-ended mode, as shown in the “Electrical Characteristics” section.

In differential input mode, VIN1LP, VIN1LN, VIN1RP and VIN1RN are used as the Port-E input pins.

See Figure 6 for examples of the external connections required in each of the supported input

configurations.

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