WM8973 Просмотр технического описания (PDF) - Wolfson Microelectronics plc

Номер в каталоге

Компоненты Описание

производитель

WM8973

Stereo CODEC for Portable Audio Applications

Wolfson Microelectronics plc 

WM8973L

Production Data

The signal inputs are biased internally to the reference voltage VREF. Whenever the line inputs are

muted or the device placed into standby mode, the inputs are kept biased to VREF using special anti-

thump circuitry. This reduces any audible clicks that may otherwise be heard when changing inputs.

DC MEASUREMENT

For DC measurements (for example, battery voltage monitoring), the input signal at the LINPUT1

and/or RINPUT1 pins can be taken directly into the respective ADC, bypassing both PGA and

microphone boost. The ADC output then becomes unsigned relative to AVDD, instead of being a

signed (two’s complement) number relative to VREF. Setting L/RDCM will override L/RINSEL. The

input range for dc measurement is AGND to AVDD.

REGISTER

ADDRESS

R32 (20h)

ADC Signal

Path Control

(Left)

BIT

LABEL

7:6 LINSEL

5:4 LMICBOOST

R33 (21h)

ADC Signal

Path Control

(Right)

7:6 RINSEL

5:4 RMICBOOST

Table 3 Input Software Control

DEFAULT

DESCRIPTION

00

Left Channel Input Select

00 = LINPUT1

01 = LINPUT2

10 = LINPUT3

11 = L-R Differential (either LINPUT1-

RINPUT1 or LINPUT2-RINPUT2,

selected by DS)

00

Left Channel Microphone Gain Boost

00 = Boost off (bypassed)

01 = 13dB boost

10 = 20dB boost

11 = 29dB boost

00

Right Channel Input Select

00 = RINPUT1

01 = RINPUT2

10 = RINPUT3

11 = L-R Differential (either LINPUT1-

RINPUT1 or LINPUT2-RINPUT2,

selected by DS)

00

Right Channel Microphone Gain Boost

00 = Boost off (bypassed)

01 = 13dB boost

10 = 20dB boost

11 = 29dB boost

REGISTER

BIT

ADDRESS

LABEL

R31 (1Fh)

5 RDCM

ADC input Mode

4 LDCM

Table 4 DC Measurement Select

DEFAULT

DESCRIPTION

0

Right Channel DC Measurement

0 = Normal Operation, PGA Enabled

1 = Measure DC level on RINPUT1

0

Left Channel DC Measurement

0 = Normal Operation, PGA Enabled

1 = Measure DC level on LINPUT1

REGISTER

BIT

ADDRESS

LABEL

R31 (1Fh)

8 DS

ADC Input Mode

Table 5 Differential Input Select

DEFAULT

DESCRIPTION

0

Differential input select

0: LINPUT1 - RINPUT1

1: LINPUT2 – RINPUT2

w

PD, Rev 4.5, December 2011

20

Share Link: