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DESCRIPTION
The WM8711BL is an ultra-small, low power stereo DAC
with an integrated headphone driver. It is designed
specifically for portable audio systems requiring hi-fi stereo
playback through headphones.
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 an ultra-
small 24-lead QFN (4x4x0.9 mm Body) package.
A USB clocking mode is provided where all audio rates can
be derived from a single 12MHz or 24MHz MCLK, saving on
the need for a PLL or multiple crystals.
WM8711BL
Ultra-Small Audio DAC with Headphone Amplifier
FEATURES
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Audio Performance
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DAC SNR 97dB (‘A’ weighted) at AVDD = 3.3V
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DAC SNR 90dB (‘A’ weighted) at AVDD = 1.8V
Low Power Headphone Playback
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Down to 6mW at 1.8V
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1.42 – 3.6V Digital Supply Operation
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1.8 – 3.6 V Analogue Supply Operation
DAC Sampling Frequency: 8kHz – 96kHz
2 or 3-Wire MPU Serial Control Interface
Programmable Audio Data Interface Modes
2
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I S, Left, Right Justified or DSP
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16/20/24/32 bit Word Lengths
-
Master or Slave Clocking Mode
Stereo Audio Outputs
Output Volume and Mute Controls
Highly Efficient Headphone Driver
24-lead QFN (4x4x0.9 mm) package
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APPLICATIONS
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Multimedia Mobile Phones
Portable MP3 / CD Players
BLOCK DIAGRAM
MODE
SCLK
SDIN
CSB
AGND
AVDD
VMID
W
WM8711B
HPVDD
CONTROL INTERFACE
HPGND
RLINEIN
MUTE
VOL/
MUTE
H/P
DRIVER
RHPOUT
DACDAT
DACLRC
DIGTAL AUDIO INTERFACE
DAC
+6 to -73dB
1 dB Steps
ROUT
DIGITAL
FILTERS
LOUT
DAC
+6 to -73dB
1 dB Steps
VOL/
MUTE
MUTE
OSC
CLKIN
DIVIDER
(Div x1,
x2)
CLKIN
DIVIDER
(Div x1,
x2)
BCLK
H/P
DRIVER
LHPOUT
LLINEIN
DCVDD
(1.5V)
DBVDD
(3.3V)
XTI/MCLK
WOLFSON MICROELECTRONICS plc
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CLKOUT
DGND
XTO
Production Data, April 2007, Rev 4.1
Copyright
©2007
Wolfson Microelectronics plc
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
