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WM8746

24-bit, 192kHz 6-Channel DAC with Volume Control

DESCRIPTION

WM8746 is a high performance 6-channel DAC designed

for audio applications such as DVD, home theatre systems,

and digital TV. The WM8746 supports data input word

lengths from 16 to 32-bits and sampling rates up to 192kHz.

The WM8746 can convert up to 6 channels at sample rates

from 8 to 192kHz. Additionally WM8746 supports 2

channels at 192kHz and 4 channels at 96kHz

simultaneously.

The WM8746 consists of a serial interface port, digital

interpolation filters, multi-bit sigma delta modulators and 6

DACs in a small 28-pin SSOP package. The WM8746 also

includes a digitally controllable mute and attenuator function

on each channel.

The WM8746 supports a variety of connection schemes for

audio DAC control. The serial control interface provides

access to a wide range of features including on-chip mute,

attenuation and phase reversal. A hardware controllable

interface is also available. It is pin-compatible with the

WM8736, (apart from RSTB pin which is typically unused).

The WM8746 is an ideal device to interface to AC-3盲,

DTS盲, and MPEG audio decoders for surround sound

applications, or for use in 鈥渦niversal鈥?high definition audio

players supporting DVD-A formats.

FEATURES

鈥?/div>

6-Channel DAC

Audio Performance

鈭?/div>

106dB SNR (鈥楢鈥?weighted @ 48kHz) DAC

鈭?/div>

-96dB THD

DAC Sampling Frequency: 8kHz 鈥?192kHz

3-Wire Serial Control Interface

Programmable Audio Data Interface Modes

鈭?/div>

I

2

S, Left, Right Justified or DSP

鈭?/div>

16/20/24/32 bit Word Lengths

Independent Digital Volume Control on Each Channel with

127.5dB Range in 0.5dB Steps

3.0V 鈥?5.5V Supply Operation

28-Pin SSOP Package

Exceeds Dolby Class A Performance Requirements

Pin Compatible with WM8736

鈥?/div>

APPLICATIONS

鈥?/div>

DVD and DVD 鈥楿niversal鈥?Players

Home theatre systems

Digital broadcast receivers

BLOCK DIAGRAM

SCKI

ML/I2S

MC/IWL

MD/DM

MODE

MUTE

WM8746

CONTROL

INTERFACE

UPDATE

IWL[1:0]

LRP

PDWN

ATC

PL[3:0]

LxA[23:0]

DEEMPH

PDWN

RxA[23:0]

BCP

PDWN

MUTE

FMT[1:0]

L0A[7:0]

Digital

Filter

Sigma

Delta

Modulator

Stereo

DAC

OUT0L

GR0

OUT0R

BCKIN

LRCIN

LRCIN2

R0A[7:0]

L1A[7:0]

AUDIO

INTERFACE

DAC

CHANNEL

CONTROL

R1A[7:0]

DIN0

DIN1

DIN2

L2A[7:0]

Digital

Filter

Sigma

Delta

Modulator

Stereo

DAC

OUT1L

GR1

OUT1R

Digital

Filter

Sigma

Delta

Modulator

Stereo

DAC

OUT2L

GR2

OUT2R

R2A[7:0]

DVDD

DGND

AGND1

AGND2

AVDD1

AVDD2

CAP

WOLFSON MICROELECTRONICS LTD

www.wolfsonmicro.com

Advance Information November 2001, Rev 1.4

Copyright

餂?001

Wolfson Microelectronics Ltd

.

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