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WM8751L
Stereo DAC For Portable Audio Applications
DESCRIPTION
FEATURES
The WM8751L is a low power, high quality stereo DAC with
integrated headphone and loudspeaker amplifiers, designed to
reduce external component requirements in portable digital
audio applications.
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The on-chip headphone amplifiers can deliver 40mW into a 16Ω
load. Advanced on-chip digital signal processing performs bass
and treble tone control.
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The WM8751L can operate as a master or a slave, with various
master clock frequencies including 12 or 24MHz for USB
devices or standard 256fs rates like 12.288MHz and
24.576MHz. Different audio sample rates such as 96kHz,
48kHz, 44.1kHz are generated directly from the master clock
without the need for an external PLL.
DAC SNR 98dB, THD -86dB (‘A’ weighted @ 48kHz, 3.3V)
On-chip 400mW BTL Speaker Driver (mono)
On-chip Headphone Driver
- 40mW output power on 16Ω / 3.3V
- SNR 96dB, THD –79dB at 20mW with 16Ω load
Stereo and Mono Line-in mix into DAC output
Separately Mixed Stereo and Mono Outputs
Digital Tone Control and Bass Boost
Low Power
- Down to 7mW for stereo playback (1.8V / 1.5V supplies)
- 10μW Shutdown Mode
Low Supply Voltages
- Analogue and Digital I/O: 1.8V to 3.6V
- Digital core: 1.42V to 3.6V
256fs / 384fs or USB master clock rates: 12MHz, 24MHz
Audio sample rates: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1,
48, 88.2, 96kHz generated internally from master clock
32-lead QFN package, 5x5x0.9mm size, 0.5mm lead pitch
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The WM8751L operates on supply voltages from 1.8V up to
3.6V, although the digital core can operate on a separate supply
down to 1.42V, saving power. Different sections of the chip can
also be powered down under software control.
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APPLICATIONS
The WM8751L is supplied in a very small and thin 5x5mm QFN
package, ideal for use in hand-held and portable systems.
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Digital Audio Player
MP3 Phone
Minidisc Player
BLOCK DIAGRAM
DBVDD
DCVDD
DGND
HPGND
W
WM8751L
MONOOUT
DIFF. IN
LEFT
LD2LO MIXER
ROUT1
VREF
LI2LO
HPVDD
M
U
X
OUT3
LOUT1
CSB
SDIN
SCLK
MODE
RD2LO
CONTROL
INTERFACE
DAC
DIGITAL
FILTERS
LD2MO
LOUT1VOL
MI2LO
MONO
MIXER
LI2MO
MONOOUT
-6dB
BCLK
DACLRC
DACDAT
DIGITAL
AUDIO
INTERFACE
RD2MO
TONE
CONTROL
DAC
MONOVOL
RI2MO
RIGHT
LD2RO MIXER
MI2RO
ROUT1
RD2RO
ROUT1VOL
RI2RO
LOUT2
MCLK
VREF
50K
50K
Loudspeaker
L - (-R)
= L+R
LOUT2VOL
ROUT2
INV
ROUT2VOL
ROUT2
HPDETECT
WOLFSON MICROELECTRONICS plc
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Production Data, November 2010, Rev 4.3
Copyright ©2010 Wolfson Microelectronics plc
