WM8976 datasheet(25/83 Pages) WOLFSON

25 / 83 page

Preliminary Technical Data

WM8976

PTD Rev 2.0 February 2005

The input PGA is enabled by the IPPGAENL register bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

Power

Management

INPPGAENL

Left channel input PGA enable

0 = disabled

1 = enabled

Table 5 Input PGA Enable Register Settings

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

LIP2INPPGA

Connect LIP pin to left channel input PGA

amplifier positive terminal.

0 = LIP not connected to input PGA

1 = input PGA amplifier positive terminal

connected to LIP (constant input

impedance)

LIN2INPPGA

Connect LIN pin to left channel input PGA

negative terminal.

0=LIN not connected to input PGA

1=LIN connected to input PGA amplifier

negative terminal.

R44

Input

Control

L2_2INPPGA

Connect L2 pin to left channel input PGA

positive terminal.

0=L2 not connected to input PGA

1=L2 connected to input PGA amplifier

positive terminal (constant input

impedance).

Table 6 Input PGA Control

INPUT PGA VOLUME CONTROLS

The input microphone PGA has a gain range from -12dB to +35.25dB in 0.75dB steps. The gain

from the LIN input to the PGA output and from the L2 amplifier to the PGA output are always

common and controlled by the register bits INPPGAVOLL[5:0]. These register bits also affect the

LIP pin when LIP2INPPGA=1, the L2 pin when L2_2INPPGA=1 and the L2 pin when

L2_2INPPGA=1.

When the Automatic Level Control (ALC) is enabled the input PGA gain is controlled automatically

and the INPPGAVOLL bits should not be used.

WM8976 датащи(PDF) 25 Page - Wolfson Microelectronics plc

WM8976 датащи(HTML) 25 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

датащи скачать

ссылки URL