WM9081 Product Flyer

WM9081
Mono dac with integrated 2.6W class ab/d speaker amplifier
Get biG sound froM sMall speakers With Wolfson’s innovative
retune™ Mobile paraMetric equaliser.
The WM9081 is a mono DAC with an integrated,
high efficiency, switchable Class AB/D speaker
amplifier, capable of delivering up to 2.6W into a
4Ω load. It is ideal for providing optimum sound
pressure levels (SPL) from low cost speakers in
applications such as portable navigation devices.
Compared to a commonly used fab chip solution
of DAC and Class D amplifier, WM9081
consumes 30% less PCB area and achieves
20% BOM reduction.
Additionally, the combination of package size,
digital audio interface and integrated speaker
amplifier in WM9081 give the system designer
several advantages in terms of noise reduction.
The I 2 S audio interface removes the need to
route noise susceptible analog audio signals
across a potentially noisy PCB. The WM9081 can
be placed very close to the speaker connectors,
minimising the Class D track lengths which
carry noisy high frequency switching currents.
tarGet applications
product benefits
High performance audio, delivers optimum
sound pressure levels (SPL), from low cost
speaker applications
Programmable dynamic range control
boosts low-level signals to maximise
volume for improved intelligibility
Portable navigation systems
ReTune™ Mobile Parametric Equaliser
enables end user defined music profiles
Mobile handsets
Signal limiter to prevent speaker damage
from signal clipping and distortion
Speaker phone systems
Multimedia accessories
Integrated register write sequencer to
minimise software development time
Digital radios
DBVDD
DGND
DCVDD
SPKVDD
SPKGND
+6dB to -57dB
1dB STEPS
0dB / -6dB
IN1
0dB / -6dB
LINEOUT
IN2
+6dB to -57dB
1dB STEPS
CS / ADDR1 / 4FS
SCLK
DIGITAL FILTERS
SPKOUTP
SDIN / ENA
VOLUME CONTROL
SDOUT / ADDR0
CONTROL
INTERFACE
PARAMETRIC EQ
SPKOUTN
DAC
SCIM / CHANNEL
DYNAMIC RANGE
CONTROLLER
SWMODE
SPEAKER BOOST
+5.1dB to 0dB
MIXER
IRQ
DACDAT
BCLK
AVDD
LRCLK
DIGITAL AUDIO
INTERFACE
WM9081
Mono DAC
with integrated
2.6W Class AB/D
speaker amplifier
MCLK
CLOCK CONTROL
WM9081
VMIDC
VOLTAGE
REFERENCE
FLL
AGND
WM9081
Mono dac with integrated 2.6W class ab/d speaker amplifier
eXceptional audio perforMance
Exceptional audio performance
92dB SNR, 1% THD @ 2.4W
Fully parametric 5 band equaliser
diGitallY optiMised sYsteM
perforMance
Output limiter and dynamic range
controller
The WM9081 integrates a five-band ReTune™
Mobile Parametric Equaliser with fully
programmable coefficients for optimisation of
speaker characteristics and speaker frequency
response compensation, allowing the end user
to define music profiles. Programmable
dynamic range control is integrated to help
boost low-level signals to maximise volume
for improved intelligibility. The WM9081 also
features a dynamic range controller (DRC) and
limiter. The limiter prevents the audio signal
from clipping and causing audible distortion,
overloading the battery and potentially
damaging the speakers. Whilst the DRC
automatically boosts low level signals to
maximize volume for improved intelligibility.
Auxiliary analogue inputs and mono line
output
Integrated FLL for flexible clocking,
supports 8kHz – 27MHz range
75dB PSRR @ 217Hz on SPKVDD for
optimal noise rejection
Sample rates 8kHz – 96kHz
2/3 wire software control and hardware
control modes
inteGrated reGister Write
sequencer
Software development time can be minimised
through the use of an integrated register write
sequencer. A number of signal paths (such as
DAC to speaker mode) can be easily enabled
and disabled by just one register write. The
internal sequencer manages this by initiating
a sequence of pre-programmed multiple writes
independently within the WM9081, minimising
control interface communication between the
processor and WM9081.
eXceptional thd+n perforMance
spk thd+n ratio vs pout 4Ω
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
0.005
0
0.5
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1.5
2
2.5
SPKVDD = 5.0V, AVDD = 3.3V, DCGAIN / ACGAIN = 3.6dB
SPKVDD = 4.2V, AVDD = 3.3V, DCGAIN / ACGAIN = 2.1dB
SPKVDD = 3.7V, AVDD = 3.0V, DCGAIN / ACGAIN = 2.1dB
SPKVDD = 3.3V, AVDD = 3.3V, DCGAIN / ACGAIN = 0dB
Wisce™ developMent environMent
and evaluation tools
For engineers who want to configure all the
options on WM9081, a full evaluation system
is available. This includes an evaluation board
and full schematics, Linux driver and WISCE™
(Wolfson Interactive Set-up Configuration
Environment). WISCE™ is a downloadable
software GUI, which allows the developer to
make real time modifications to an interactive
version of the register map and modify the
device configuration, whilst developing
software settings.
www.wolfsonmicro.com
CONTACT DETAILS
For more information please visit
www.wolfsonmicro.com
1
OUTPUT POWER (W)
World headquarters
usa sales office
Japan sales office
Wolfson Microelectronics plc
Wolfson Microelectronics, inc.
Wolfson Microelectronics plc
Wolfson Microelectronics plc
Westfield House
26 Westfield Road
Edinburgh
EH11 2QB
United Kingdom
10001 N. De Anza Boulevard
Suite 301
Cupertino
CA 95014
USA
23F Sky Building
2-19-12 Takashima
Nishi-ku
Yokohama, 220-0011
Japan
2F, No.39, Alley 20
Lane 407, Sec. 2
Tiding Boulevard, NeiHu District
Taipei 114
Taiwan
t: +44 (0) 131 272 7000
f: +44 (0) 131 272 7001
e: [email protected]
t: +1 (408) 329 9800
e: [email protected]
t: +81 (0) 45 440 1230
f: +81 (0) 45 440 1231
e: [email protected]
t: +886 (0) 2 875 11600
f: +886 (0) 2 875 10201
e: [email protected]
asia pacific sales office
© copYriGht 2009, Wolfson Microelectronics plc.
and the wave logo are a registered trademark of Wolfson Microelectronics plc. all other trademarked names, whether indicated as such or not, are the property of their respective
owners. the information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. Wolfson Microelectronics plc assumes no responsibility for errors and omissions, and disclaims responsibility
for any consequences resulting from the use of information contained in the document.
PO-FL-9081-06/09
Mono I 2 S 24bit DAC with integrated mono
2.6W Class AB/D speaker amp
WM9081 provides Wolfson’s brand renowned
high performance audio, with 92dB SNR in
Class D mode and 1% THD+N @ 2.4W output
power levels into 4Ω speaker loads, so designers
of portable systems do not need to sacrifice on
audio performance when seeking maximum
output power.
THD+N (%)
product features