WM8720
24-bit, 96kHz Stereo DAC with Volume Control
Production Data, November 2000, Rev 3.0
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
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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
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APPLICATIONS
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CD, DVD audio
Home theatre systems
Set top boxes
Digital TV
BLOCK DIAGRAM
SCKI
(2)
ML/I2S MC/IWL MD/DM
(4)
(5)
(6)
PWDN RSTB MODE
(1)
(7)
(18)
MUTE
(17)
256fs/384fs
WM8720
CONTROL INTERFACE
(3) TEST
(8) ZERO
BCKIN (14)
LRCIN (16)
DIN (15)
SERIAL
INTERFACE
DIGITAL
FILTERS
MUTE/
ATTEN
SIGMA
DELTA
MODULATOR
DAC
(9) VOUTR
MUTE/
ATTEN
SIGMA
DELTA
MODULATOR
DAC
(12) VOUTL
(20)
(10)
DGND AGND
(13)
CAP
(11)
(19)
AVDD DVDD
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
.
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
