WM8972L datasheet(24/49 Pages) WOLFSON

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WM8972L

Preliminary Technical Data

PTD Rev 2.2 June 2004

OUTPUT MIXERS

The WM8972L provides the option to mix the DAC output signal with analogue line-in signals from

the INPUT1+/- or INPUT2+/- pins or a mono differential input (INPUT1+ – INPUT1-) or (INPUT2+ –

INPUT2-), selected by DS (see Table 3). The level of the mixed-in signals can be controlled with

PGA (Programmable Gain Amplifier).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R34 (22h)

Plus Mixer (1)

2:0

+MIXSEL

000

Plus Input Selection for Output Mix

000 = INPUT1+

001 = INPUT2+

011 = ADC Input (after PGA /

MICBOOST)

100 = Differential input

R36 (24h)

Minus Mixer

(1)

2:0

-MIXSEL

000

Minus Input Selection for Output Mix

000 = INPUT1-

001 = INPUT2-

011 = RESERVED (Do not use)

100 = Differential input

Table 14 Output Mixer Signal Selection

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

D2+MO

DAC to Plus Mixer

0 = Disable (Mute)

1 = Enable Path

+M2+MO

+MIXSEL Signal to Plus Mixer

0 = Disable (Mute)

1 = Enable Path

R34 (22h)

Plus Mixer

Control (1)

6:4

+M2+MOVOL

[2:0]

101

(-9dB)

+MIXSEL Signal to Plus Mixer Volume

000 = +6dB

… (3dB steps)

111 = -15dB

-M2+MO

-MIXSEL Signal to Plus Mixer

0 = Disable (Mute)

1 = Enable Path

R35 (23h)

Plus Mixer

Control (2)

6:4

-M2+MOVOL

[2:0]

101

(-9dB)

-MIXSEL Signal to Plus Mixer Volume

000 = +6dB

… (3dB steps)

111 = -15dB

Table 15 Plus Output Mixer Control

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