WM8994ECSSLASHR datasheet(131/363 Pages) CIRRUS

131 / 363 page

WM8994

Rev 4.6

131

LINE OUTPUT MIXERS

The WM8994 provides two pairs of line outputs, both with highly configurable output mixers. The

outputs LINEOUT1N and LINEOUT1P can be configured as two single-ended outputs or as a

differential output. In the same manner, LINEOUT2N and LINEOUT2P can be configured either as two

single-ended outputs or as a differential output. The respective line output mixers can be configured in

single-ended mode or differential mode; each mode supports multiple signal path configurations.

LINEOUT1 single-ended mode is selected by setting LINEOUT1_MODE = 1. In single-ended mode,

any of three possible signal paths may be enabled:



MIXOUTL (left output mixer) to LINEOUT1P



MIXOUTR (right output mixer) to LINEOUT1N



MIXOUTL (left output mixer) to LINEOUT1N

LINEOUT1 differential mode is selected by setting LINEOUT1_MODE = 0. In differential mode, any of

three possible signal paths may be enabled:



MIXOUTL (left output mixer) to LINEOUT1N and LINEOUT1P



IN1L (input PGA) to LINEOUT1N and LINEOUT1P



IN1R (input PGA) to LINEOUT1N and LINEOUT1P

The LINEOUT1 output mixers are controlled as described in Table 68. Care should be taken to avoid

clipping when enabling more than one path to the line output mixers. The LINEOUT1_VOL control can

be used to provide -6dB attenuation when more than one full scale signal is applied.

When using the LINEOUT1 mixers in single-ended mode, a buffered VMID must be enabled. This is

achieved by setting LINEOUT_VMID_BUF_ENA

, as described in the “Analogue Outputs” section.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R30 (001Eh)

Line Outputs

Volume

LINEOUT1N_MUTE

LINEOUT1N Line Output Mute

0 = Un-mute

1 = Mute

LINEOUT1P_MUTE

LINEOUT1P Line Output Mute

0 = Un-mute

1 = Mute

LINEOUT1_VOL

LINEOUT1 Line Output Volume

0 = 0dB

1 = -6dB

Applies to both LINEOUT1N and

LINEOUT1P

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