WM8711 Datasheet, PDF (1/36 Pages) Wolfson Microelectronics plc – Internet Audio DAC with Integrated Headphone Driver

WM8711
Internet Audio DAC with Integrated Headphone Driver
Product Preview, Novembert 2000, 1.2
DESCRIPTION
The WM8711 is a low power stereo DAC with an integrated
headphone driver. The WM8711 is designed specifically for
portable MP3 audio and speech players. The WM8711 is
also ideal for MD, CD machines and DAT players.
Stereo 24-bit multi-bit sigma delta DACs are used with
oversampling digital interpolation filters. Digital audio input
word lengths from 16-32 bits and sampling rates from 8KHz
to 96KHz are supported.
Stereo audio outputs are buffered for driving headphones
from a programmable volume control, line level outputs are
also provided along with anti-thump mute and power
up/down circuitry.
The device is controlled via a 2 or 3 wire serial interface.
The interface provides access to all features including
volume controls, mutes, de-emphasis and extensive power
management facilities. The device is available in a small 28-
pin SSOP package.
A USB mode is provided where all audio rates can be
derived from a single 12MHz MCLK, saving on the need for
a PLL or multiple crystals.
FEATURES
• Audio Performance
- 100dB SNR (‘A’ weighted @ 48kHz) DAC
- 1.42 – 3.6V Digital Supply Operation
- 2.7 – 3.6V Analogue Supply Operation
• DAC Sampling Frequency: 8KHz – 96KHz
• 2 or 3-Wire MPU Serial Control Interface
• Programmable Audio Data Interface Modes
- I²S, Left, Right Justified or DSP
- 16/20/24/32 bit Word Lengths
- Master or Slave Clocking Mode
• Stereo Audio Outputs
• Output Volume and Mute Controls
• Highly Efficient Headphone Driver
• Playback Mode Power Consumption < 18mW
• 28-Pin SSOP Package
APPLICATIONS
• Portable MP3 Players
• CD and Minidisc Players
BLOCK DIAGRAM
(22) (23) (24) (21)
(14) (16) (15)
WM8711
CONTROL INTERFACE
DACDAT (4)
DACLRC (5)
BCLK (3)
DAC
MUTE
Σ
VOL/
MUTE
+6 to -73dB
1 dB Steps
H/P
DRIVER
DIGITAL
FILTERS
OSC
DAC
Σ
CLKIN
DIVIDER
(Div x1, x2)
CLKIN
DIVIDER
(Div x1, x2)
MUTE
+6 to -73dB
1 dB Steps
VOL/
MUTE
H/P
DRIVER
(26) (25)
(2)
(27) (1) (28)
(8) HPVDD
(11) HPGND
(19) RLINEIN
(10) RHPOUT
(13) ROUT
(12) LOUT
(9) LHPOUT
(20) LLINEIN
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: [phone]
Fax: [phone]
Email: [e-mail]
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.