WM8720

24-bit, 96kHz Stereo DAC with Volume Control

Production Data, November 2000, Rev 3.0

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

Production Data Datasheets contain final

specifications current on publication date.

Supply of products conforms to Wolfson

Microelectronics’ Terms and Conditions.

2000 Wolfson Microelectronics Ltd

.

DESCRIPTION

The WM8720 is a high performance stereo DAC designed

for audio applications such as CD, DVD, home theatre

systems, set top boxes and digital TV. The WM8720

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

sampling rates up to 96kHz. The WM8720 consists of a

serial interface port, digital interpolation filter, multi-bit

sigma delta modulator and stereo DAC in a small 20-pin

SSOP package. The WM8720 also includes a digitally

controllable mute and attenuator function on each channel.

The WM8720 supports a variety of 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.

The programmable data input port supports a variety of

glueless interfaces to popular DSPs, audio decoders and

S/PDIF and AES/EBU receivers.

FEATURES

•

Performance:

-

102dB SNR (‘A’ weighted @48kHz),

-

THD: -95dB @ 0dB FS

•

5V or 3.3V supply operation

•

Sampling frequency: 8kHz to 96kHz

•

Input data word: 16 to 24-bit

•

Hardware or SPI compatible serial port control modes:

-

Hardware mode: system clock, reset, mute,

de-emphasis

-

Serial control mode: mute, de-emphasis, digital

attenuation (256 steps), zero mute, phase reversal,

power down

•

Compatible with PCM1720

APPLICATIONS

•

CD, DVD audio

•

Home theatre systems

•

Set top boxes

•

Digital TV

BLOCK DIAGRAM

SERIAL

INTERFACE

DIGITAL

FILTERS

CONTROL INTERFACE

BCKIN (14)

(9) VOUTR

(12) VOUTL

SIGMA

DELTA

MODULATOR

MUTE/

ATTEN

(20)

DGND

(10)

AGND

(13)

CAP

(11)

AVDD

(19)

DVDD

LRCIN (16)

DIN (15)

(3) TEST

(8) ZERO

256fs/384fs

MUTE

(17)

MODE

(18)

RSTB

(7)

PWDN

(1)

MD/DM

(6)

MC/IWL

(5)

ML/I2S

(4)

SCKI

(2)

DAC

SIGMA

DELTA

MODULATOR

MUTE/

ATTEN

DAC

WM8720