Portable navigation systems
Mobile handsets
Speaker phone systems
Multimedia accessories
Digital radios
tarGet applications product benefits
High performance audio, delivers optimumsound pressure levels (SPL), from low costspeaker applications
Programmable dynamic range controlboosts low-level signals to maximisevolume for improved intelligibility
ReTune™ Mobile Parametric Equaliserenables end user defined music profiles
Signal limiter to prevent speaker damagefrom signal clipping and distortion
Integrated register write sequencer tominimise software development time
WM9081
The WM9081 is a mono DAC with an integrated,high efficiency, switchable Class AB/D speakeramplifier, capable of delivering up to 2.6W into a4Ω load. It is ideal for providing optimum soundpressure levels (SPL) from low cost speakers inapplications such as portable navigation devices.Compared to a commonly used fab chip solutionof DAC and Class D amplifier, WM9081consumes 30% less PCB area and achieves20% BOM reduction.
Additionally, the combination of package size,digital audio interface and integrated speakeramplifier in WM9081 give the system designerseveral advantages in terms of noise reduction.The I2S audio interface removes the need toroute noise susceptible analog audio signalsacross a potentially noisy PCB. The WM9081 canbe placed very close to the speaker connectors,minimising the Class D track lengths whichcarry noisy high frequency switching currents.
Mono dac with integrated 2.6W class ab/d speaker amplifier
Get biG sound froM sMall speakers With Wolfson’s innovativeretune™ Mobile paraMetric equaliser.
LINEOUT
SPKOUTP
SPKOUTN
AVDD
VMIDC
AGND
SPKGNDSPKVDDDCVDDDGNDDBVDD
0dB / -6dB+6dB to -57dB
1dB STEPS
+6dB to -57dB1dB STEPS
SPEAKER BOOST+5.1dB to 0dB
VOLTAGEREFERENCE
0dB / -6dB
WM9081
IN1
IN2
CS / ADDR1 / 4FS
SCLK
SDIN / ENA
SDOUT / ADDR0
SCIM / CHANNEL
SWMODE
CONTROLINTERFACE
FLL
DAC
MIXER
DIGITAL FILTERS
VOLUME CONTROL
PARAMETRIC EQ
DYNAMIC RANGECONTROLLER
DIGITAL AUDIOINTERFACE
CLOCK CONTROL
IRQ
DACDAT
BCLK
LRCLK
MCLK
WM9081
Mono DACwith integrated2.6W Class AB/Dspeaker amplifier
WM9081
Mono dac with integrated 2.6W class ab/d speaker amplifier
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© 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 respectiveowners. 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 responsibilityfor any consequences resulting from the use of information contained in the document.
product features
Mono I2S 24bit DAC with integrated mono2.6W Class AB/D speaker amp
Exceptional audio performance92dB SNR, 1% THD @ 2.4W
Fully parametric 5 band equaliser
Output limiter and dynamic rangecontroller
Auxiliary analogue inputs and mono lineoutput
Integrated FLL for flexible clocking,supports 8kHz – 27MHz range
75dB PSRR @ 217Hz on SPKVDD foroptimal noise rejection
Sample rates 8kHz – 96kHz
2/3 wire software control and hardwarecontrol modes
eXceptional audio perforMance
WM9081 provides Wolfson’s brand renownedhigh performance audio, with 92dB SNR inClass D mode and 1% THD+N @ 2.4W outputpower levels into 4Ω speaker loads, so designersof portable systems do not need to sacrifice onaudio performance when seeking maximumoutput power.
diGitallY optiMised sYsteMperforMance
The WM9081 integrates a five-band ReTune™Mobile Parametric Equaliser with fullyprogrammable coefficients for optimisation ofspeaker characteristics and speaker frequencyresponse compensation, allowing the end userto define music profiles. Programmabledynamic range control is integrated to helpboost low-level signals to maximise volumefor improved intelligibility. The WM9081 alsofeatures a dynamic range controller (DRC) andlimiter. The limiter prevents the audio signalfrom clipping and causing audible distortion,overloading the battery and potentiallydamaging the speakers. Whilst the DRCautomatically boosts low level signals tomaximize volume for improved intelligibility.
inteGrated reGister Writesequencer
Software development time can be minimisedthrough the use of an integrated register writesequencer. A number of signal paths (such asDAC to speaker mode) can be easily enabledand disabled by just one register write. Theinternal sequencer manages this by initiatinga sequence of pre-programmed multiple writesindependently within the WM9081, minimisingcontrol interface communication between theprocessor and WM9081.
Wisce™ developMent environMentand evaluation tools
For engineers who want to configure all theoptions on WM9081, a full evaluation systemis available. This includes an evaluation boardand full schematics, Linux driver and WISCE™(Wolfson Interactive Set-up ConfigurationEnvironment). WISCE™ is a downloadablesoftware GUI, which allows the developer tomake real time modifications to an interactiveversion of the register map and modify thedevice configuration, whilst developingsoftware settings.
0 2.50.5 1 1.5 2
OUTPUT POWER (W)
5
2
1
0.5
0.2
0.1
0.05
0.02
0.01
0.005
TH
D+
N(%
)
eXceptional thd+n perforMancespk thd+n ratio vs pout 4Ω
• 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
CONTACT DETAILS www.wolfsonmicro.com
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9081
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