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XWM8711EDS Datasheet

  • XWM8711EDS

  • Internet Audio DAC with Integrated Headphone Driver

  • 36頁(yè)

  • WOLFSON

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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
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Audio Performance
-
100dB SNR (鈥楢鈥?weighted @ 48kHz) DAC
-
1.42 鈥?3.6V Digital Supply Operation
-
2.7 鈥?3.6V Analogue Supply Operation
DAC Sampling Frequency: 8KHz 鈥?96KHz
2 or 3-Wire MPU Serial Control Interface
Programmable Audio Data Interface Modes
-
I
2
S, 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
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鈥?/div>
鈥?/div>
鈥?/div>
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鈥?/div>
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APPLICATIONS
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Portable MP3 Players
CD and Minidisc Players
BLOCK DIAGRAM
MODE
AGND
(15)
AVDD
SCLK
VMID
(16)
SDIN
CSB
(22)
(23)
(24)
(21)
(14)
(8) HPVDD
CONTROL INTERFACE
WM8711
(11) HPGND
(19) RLINEIN
MUTE
VOL/
MUTE
DIGTAL AUDIO INTERFACE
H/P
DRIVER
(10) RHPOUT
DAC
DACDAT (4)
DACLRC (5)
危
+6 to -73dB
1 dB Steps
(13) ROUT
DIGITAL
FILTERS
(12) LOUT
DAC
BCLK (3)
危
MUTE
+6 to -73dB
1 dB Steps
VOL/
MUTE
H/P
DRIVER
(9) LHPOUT
OSC
CLKIN
DIVIDER
(Div x1, x2)
CLKIN
DIVIDER
(Div x1, x2)
(20) LLINEIN
(26)
XTO
(25)
XTI/MCLK
(2)
CLKOUT
(27)
DCVDD
(1.5V)
(1)
DBVDD
(3.3V)
(28)
DGND
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.
餂?000
Wolfson Microelectronics Ltd
.

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