WM8994 datasheet(126/359 Pages) WOLFSON

126 / 359 page

WM8994

Production Data

PD, April 2012, Rev 4.4

126

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R31 (001Fh)

HPOUT2

Volume

HPOUT2_MUTE

HPOUT2 (Earpiece Driver) Mute

0 = Un-mute

1 = Mute

HPOUT2_VOL

HPOUT2 (Earpiece Driver) Volume

0 = 0dB

1 = -6dB

R51 (0033h)

HPOUT2

Mixer

IN2LRP_TO_HPOUT2

Direct Voice (VRXN-VRXP) to

Earpiece Driver

0 = Mute

1 = Un-mute

MIXOUTLVOL_TO_HP

OUT2

MIXOUTLVOL (Left Output Mixer

PGA) to Earpiece Driver

0 = Mute

1 = Un-mute

MIXOUTRVOL_TO_HP

OUT2

MIXOUTRVOL (Right Output Mixer

PGA) to Earpiece Driver

0 = Mute

1 = Un-mute

Table 67 Earpiece Driver Mixer (HPOUT2MIX) Control

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.

WM8994 Datasheet(PDF) 126 Page - Wolfson Microelectronics plc

WM8994 Datasheet(HTML) 126 Page - Wolfson Microelectronics plc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL