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WM8746

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

Wolfson Microelectronics plc 

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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,

DTS, and MPEG audio decoders for surround sound

applications, or for use in “universal” high definition audio

players supporting DVD-A formats.

FEATURES

• 6-Channel DAC

• Audio Performance

− 106dB SNR (‘A’ weighted @ 48kHz) DAC

− -95dB THD

• DAC Sampling Frequency: 8kHz – 192kHz

• 3-Wire Serial Control Interface

• Programmable Audio Data Interface Modes

− I2S, Left, Right Justified or DSP

− 16/20/24/32 bit Word Lengths

• Independent Digital Volume Control on Each Channel with

127.5dB Range in 0.5dB Steps

• 3.0V – 5.5V Supply Operation

• 28-Pin SSOP Package

• Exceeds Dolby Class A Performance Requirements

• Pin Compatible with WM8736

APPLICATIONS

• DVD and DVD ‘Universal’ Players

• Home theatre systems

• Digital broadcast receivers

BLOCK DIAGRAM

SCKI ML/I2S MC/IWL MD/DM

MODE MUTE

CONTROL

INTERFACE

WM8746

BCKIN

LRCIN

LRCIN2

DIN0

DIN1

DIN2

AUDIO

INTERFACE

DAC

CHANNEL

CONTROL

DVDD

DGND

L0A[7:0]

Digital

Filter

R0A[7:0]

L1A[7:0]

Digital

Filter

R1A[7:0]

L2A[7:0]

Digital

Filter

R2A[7:0]

Sigma

Delta

Modulator

Stereo

DAC

Sigma

Delta

Modulator

Stereo

DAC

Sigma

Delta

Modulator

Stereo

DAC

OUT0L

GR0

OUT0R

OUT1L

GR1

OUT1R

OUT2L

GR2

OUT2R

AGND1 AGND2 AVDD1 AVDD2 CAP

WOLFSON MICROELECTRONICS plc

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Production Data, March 2006, Rev 4.0

Copyright 2006 Wolfson Microelectronics plc

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