WM8974GEFLSLASHV datasheet(75/87 Pages) WOLFSON

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Production Data

WM8974

PD Rev 4.2 March 2007

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

INPPGAMUTE

Mute control for input PGA:

0=Input PGA not muted, normal operation

1=Input PGA muted (and disconnected from the following

input BOOST stage).

Input Signal Path

5:0

INPPGAVOL

010000

Input PGA volume

000000 = -12dB

000001 = -11.25db

010000 = 0dB

111111 = 35.25dB

Input Signal Path

PGABOOST

Input Boost

0 = PGA output has +0dB gain through input BOOST stage.

1 = PGA output has +20dB gain through input BOOST stage.

Input Signal Path

Reserved

6:4

MICP2BOOSTVOL 000

Controls the MICP pin to the input boost stage (NB, when

using this path set MICP2INPPGA=0):

000=Path disabled (disconnected)

001=-12dB gain through boost stage

010=-9dB gain through boost stage

…

111=+6dB gain through boost stage

Input Signal Path

Reserved

47 (2Fh)

2:0

AUX2BOOSTVOL 000

Controls the auxilliary amplifier to the input boost stage:

000=Path disabled (disconnected)

001=-12dB gain through boost stage

010=-9dB gain through boost stage

…

111=+6dB gain through boost stage

Input Signal Path

8:4

00000

Reserved

MONOBOOST

Mono output boost stage control (see Table 37 for details)

0=No boost (output is inverting buffer)

1=1.5x gain boost

Analogue Outputs

SPKBOOST

Speaker output boost stage control (see Table 37 for details)

0=No boost (outputs are inverting buffers)

1 = 1.5x gain boost

Analogue Outputs

TSDEN

Thermal Shutdown Enable

0 : thermal shutdown disabled

1 : thermal shutdown enabled

Output Switch

49 (31h)

VROI

VREF (AVDD/2 or 1.5xAVDD/2) to analogue output

resistance

0: approx 1k

Ω

1: approx 30 k

Ω

Analogue Outputs

8:6

000

Reserved

AUX2SPK

Output of auxiliary amplifier to speaker mixer input

0 = not selected

1 = selected

Analogue Outputs

4:2

000

Reserved

BYP2SPK

Bypass path (output of input boost stage) to speaker mixer

input

0 = not selected

1 = selected

Analogue Outputs

50 (32h)

DAC2SPK

Output of DAC to speaker mixer input

0 = not selected

1 = selected

Analogue Outputs

WM8974GEFL/V Datasheet(PDF) 75 Page - Wolfson Microelectronics plc

WM8974GEFL/V Datasheet(HTML) 75 Page - Wolfson Microelectronics plc

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