WM8711BL_07 Datasheet, PDF (1/43 Pages) Wolfson Microelectronics plc – Ultra-Small Audio DAC with Headphone Amplifier

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WM8711BL
Ultra-Small Audio DAC with Headphone Amplifier
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.
BLOCK DIAGRAM
FEATURES
• Audio Performance
- DAC SNR 97dB (‘A’ weighted) at AVDD = 3.3V
- DAC SNR 90dB (‘A’ weighted) at AVDD = 1.8V
• Low Power Headphone Playback
- Down to 6mW at 1.8V
- 1.42 – 3.6V Digital Supply Operation
- 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
- 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
• 24-lead QFN (4x4x0.9 mm) package
APPLICATIONS
• Multimedia Mobile Phones
• Portable MP3 / CD Players
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WM8711B
CONTROL INTERFACE
DACDAT
DACLRC
BCLK
DIGITAL
FILTERS
MUTE
DAC
DAC
OSC
CLKIN
DIVIDER
(Div x1,
x2)
CLKIN
DIVIDER
(Div x1,
x2)
MUTE
VOL/
MUTE
+6 to -73dB
1 dB Steps
H/P
DRIVER
+6 to -73dB
1 dB Steps
VOL/
MUTE
H/P
DRIVER
HPVDD
HPGND
RLINEIN
RHPOUT
ROUT
LOUT
LHPOUT
LLINEIN
WOLFSON MICROELECTRONICS plc
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Production Data, April 2007, Rev 4.1
Copyright ©2007 Wolfson Microelectronics plc