WM8733

102dB Stereo DAC

Product Preview, July 2000, Rev 1.3

WOLFSON MICROELECTRONICS LTD.

Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK

Tel: +44 (0) 131 667 9386

Fax: +44 (0) 131 667 5176

Email: sales@wolfson.co.uk

http://www.wolfson.co.uk

Product Preview data sheets contain

specifications for products in the formative

phase of development. These products may

be changed or discontinued without notice.

2000 Wolfson Microelectronics Ltd

.

DESCRIPTION

WM8733 is a high performance stereo DAC designed for use in

portable audio equipment, video CD players and similar

applications. It comprises selectable normal or I

serial data interfaces for 16 to 24-bit inputs, high performance

digital filters, and sigma-delta output DACs, achieving an 102dB

signal-to-noise ratio.

The device is available in a 14-pin SOIC package that offers

selectable mute and de-emphasis functions using a minimum of

external components.

Low supply voltage operation and low current consumption are

valuable features, particularly for use in portable equipment.

Additional modes consist of a powerdown option and the

possibility of generating separate differential left and right

outputs for applications demanding higher performance.

FEATURES

• High tolerance to clock jitter

• Compatible with PCM1733

• Distortion > 90dB, SNR > 102dB, dynamic range

performance > 100dB

• Stereo DAC with input sampling from 8kHz to 96kHz

• Additional mute feature and high performance

differential modes

• Sigma-delta design with 64x oversampling

• System clock 256fs or 384fs or 512fs

• Supply range 3V to 5V

• Analogue voltage output to drive 2kΩ load

• 14-pin SOIC package

APPLICATIONS

• High performance consumer audio

BLOCK DIAGRAM

(5)

CAP

DIGITAL

SIGMA-DELTA

MODULATOR

DIGITAL

SIGMA-DELTA

MODULATOR

LRCIN (1)

DIGITAL

GND

DIGITAL

VDD

SEL[1] (11)

INFINITE

ZERO

DETECT

10k

Wired

OR

SEL[0]

0

0

1

1

SEL[1]

0

1

0

1

MODE

Normal stereo

Power down

Left only differential output

Right only differential output

SEL[0] (4)

SERIAL

INTERFACE

DIGITAL

FILTERS

(12)

DEEMPH

(10)

MUTE

SWITCHED

CAPACITOR

DAC

SWITCHED

CAPACITOR

DAC

(8)

VDD

(7)

GND

(9) VOUTL

(6) VOUTR

BCKIN (3)

FORMAT (13)

SCKI (14)

DIN (2)

WM8733