WM8751L
STEREO DAC FOR PORTABLE AUDIO APPLICATIONS
DESCRIPTION
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.
The on-chip headphone amplifiers can deliver 40mW into a
16Ω load. Advanced on-chip digital signal processing
performs bass and treble tone control.
The WM8751L can operate as a master or a slave, with
various master clock frequencies including 12 or 24MHz for
USB devices or standard 256f
s
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.
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.
The WM8751L is supplied in a very small and thin 5x5mm
QFN package, ideal for use in hand-held and portable
systems.
FEATURES
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DAC SNR 98dB, THD -95dB (‘A’ weighted @ 48kHz, 3.3V)
On-chip 400mW BTL Speaker Driver (mono)
On-chip Headphone Driver
°
40mW output power on 16Ω / 3.3V
°
THD –80dB at 20mW, SNR 90dB 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
Low Supply Voltages
°
Analogue 1.8V to 3.6V
°
Digital core: 1.42V to 3.6V
°
Digital I/O: 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-pin QFN package, 5x5x0.9mm size, 0.5mm lead pitch
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APPLICATIONS
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Digital Audio Player
MP3 Phone
Minidisc Player
BLOCK DIAGRAM
MONOIN+
MONOIN-
LINEINL
LINEINR
DBVDD
DCVDD
DGND
HPGND
HPVDD
W
WM8751L
LEFT
LD2LO MIXER
DIFF. IN
LI2LO
MONOOUT
ROUT1
VREF
M
U
X
-1
OUT3
LOUT1
CSB
SDIN
SCLK
MODE
RD2LO
CONTROL
INTERFACE
DAC
DIGITAL
FILTERS
VREF
LD2MO
MONO
MIXER
MI2LO
LI2MO
LOUT1VOL
MONOOUT
RD2MO
RI2MO
MI2RO
MONOVOL
BCLK
DACLRC
DACDAT
DIGITAL
AUDIO
INTERFACE
TONE
CONTROL
DAC
RIGHT
LD2RO MIXER
ROUT1
RD2RO
RI2RO
ROUT1VOL
MCLK
VREF
-1
50K
50K
LOUT2VOL
ROUT2
INV
LOUT2
Loudspeaker
L - (-R)
= L+R
ROUT2
ROUT2VOL
AVDD
AGND
VREF
VMID
HPDETECT
WOLFSON MICROELECTRONICS PLC
www.wolfsonmicro.com
Product Preview, May 2003, Rev 1.42
Copyright
2003
Wolfson Microelectronics Ltd.
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
