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 • • • • or sign up for Wolfson eNews at: www.wolfsonmicro.com/enews 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