WM8720 Ver la hoja de datos (PDF) - Wolfson Microelectronics plc

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componentes Descripción

Fabricante

WM8720

24-bit, 96kHz Stereo DAC with Volume Control

Wolfson Microelectronics plc 

WM8720

Production Data

MODES OF OPERATION

Control of the various modes of operation is either by software control over the serial interface, or

by hard-wired pin control. Selection of software or hardware mode is via MODE pin. The following

functions may be controlled either via the serial control interface or by hard wiring of the

appropriate pins.

FUNCTION

Input audio

data format

Input word length

De-emphasis selection

OPTIONS

Normal format

I2S format

16

18

20

24

On

Off

SOFTWARE CONTROL

DEFAULT VALUE

PIN 18: MODE = 0

I2S = 0 (default)

I2S = 1

IW[1:0] = 00 (default)

IW[1:0] = 11

IW[1:0] = 01

IW[1:0] = 10

DE = 1

DE = 0 (default)

HARDWARE CONTROL

BEHAVIOUR

PIN 18: MODE = 1

Pin 4, 5: ML/ I2S, MC/IWL =

00 or 01 or 10

Pin 4, 5: ML/I2S, MC/IWL = 11

Pin 4, 5: ML/I2S, MC/IWL = 00

Pin 4, 5: ML/I2S, MC/IWL = 11

(I2S only)

Pin 4, 5: ML/I2S, MC/IWL = 01

Pin 4, 5: ML/I2S, MC/IWL = 10

Pin 6: MD/DM = 1

Pin 6: MD/DM = 0

Mute

On

Off

MU = 1

MU = 0 (default)

Pin 17: MUTE = 1

Pin 17: MUTE = 0

Power down control

Input LRCIN polarity

Volume control

Infinite zero detect

Operation enable (OPE)

WM8720 on

WM8720 off

Lch/Rch = High/low

Lch/Rch = Low/high

Lch, Rch individually

Lch, Rch common

On

Off

Enabled

Disabled

DAC output control

See Table 11

for all options

Available from Pin 1: PWDN

LRP = 0 (default)

LRP = 1

ATC = 0; 0dB (default)

ATC = 1

IZD = 1

IZD = 0 (default)

OPE = 0 (default)

OPE = 1

Default is PL[3:0] = 1001,

stereo mode

Pin 1: PWDN = 0

Pin 1: PWDN = 1

Not available in hardware mode,

default value set

Not available in hardware mode,

default 0dB

Automute function controlled

from MUTE pin

Low = not mute

Z = automute enable

High = muted

Not available in hardware mode

Table 3 Control Function Summary

HARDWARE CONTROL MODES

When the MODE pin is held high the following hardware modes of operation are available.

MUTE AND AUTOMUTE OPERATION

In both hardware and software modes pin 17 (MUTE) controls selection of mute directly, and can be

used to enable and disable the automute function, or as an output of the automuted signal.

IZD (Register Bit)

AUTOMUTED

(Internal Signal)

MUTE

PIN

10kΩ

SOFTMUTE

(Internal Signal)

MU (Register Bit)

Figure 6 Mute Circuit Operation

w

PD Rev 4.0 February 2005

10

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