WM8740EDS Просмотр технического описания (PDF) - Wolfson Microelectronics plc

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WM8740EDS

24-bit, High Performance 192kHz Stereo DAC

Wolfson Microelectronics plc 

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WM8740

24-bit, High Performance 192kHz Stereo DAC

DESCRIPTION

The WM8740 is a very high performance stereo DAC

designed for audio applications such as CD, DVD, home

theatre systems, set top boxes and digital TV. The WM8740

supports data input word lengths from 16 to 24-bits and

sampling rates up to 192kHz. The WM8740 consists of a

serial interface port, digital interpolation filter, multi-bit sigma

delta modulator and stereo DAC in a small 28-pin SSOP

package. The WM8740 also includes a digitally controllable

mute and attenuator function on each channel.

The internal digital filter has two selectable roll-off

characteristics. A sharp or slow roll-off can be selected

dependent on application requirements. Additionally, the

internal digital filter can be by-passed and the WM8740

used with an external digital filter.

The WM8740 supports two connection schemes for audio

DAC control. The SPI-compatible serial control port

provides access to a wide range of features including on-

chip mute, attenuation and phase reversal. A hardware

controllable interface is also available.

FEATURES

• 120dB SNR (‘A’ weighted mono @48kHz), THD+N: -104dB

@ FS

• 117dB SNR (‘A’ weighted stereo @48kHz), THD+N: -104dB

@ FS

• Sampling frequency: 8kHz to 192kHz

• Selectable digital filter roll-off

• Optional interface to industry standard external filters

• Differential mono mode needing no glue logic

• Input data word: 16 to 24-bit

• Hardware or SPI compatible serial port control modes:

• Hardware mode: mute, de-emphasis, audio format

control

• Serial mode: mute, de-emphasis, attenuation (256

steps), phase reversal

• Fully differential voltage outputs

APPLICATIONS

• CD, DVD audio

• Home theatre systems

• Professional audio systems

BLOCK DIAGRAM

CONTROL INTERFACE

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WM8740

VMIDR

SCLK

BCKIN

LRCIN

DIN

SERIAL

INTERFACE

MUTE/

ATTEN

MUTE/

ATTEN

DIGITAL

FILTERS

MUX

MUX

SIGMA

DELTA

MODULATOR

SIGMA

DELTA

MODULATOR

RIGHT

DAC

LEFT

DAC

LOW

PASS

FILTER

LOW

PASS

FILTER

VOUTRP

VOUTRN

VOUTLP

VOUTLN

VMIDL

WOLFSON MICROELECTRONICS plc

w :: www.wolfsonmicro.com

Production Data, April 2004, Rev 4.0

Copyright 2004 Wolfson Microelectronics plc

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