Home > New Wolfson mono DAC and speaker amplifier available from Caelera

New Wolfson mono DAC and speaker amplifier available from Caelera

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Wolfson Microelectronics WM9081, available from Caelera , is a new single chip mono DAC and speaker amplifier. The Wolfson WM9081 single chip mono DAC and speaker amplifier is suitable for delivering optimum sound pressure levels (SPL) and maximum intelligibility from low cost speakers. The Wolfson WM9081 single chip mono DAC and speaker amplifier is typically used in portable navigation devices, mobile handsets, digital radios and conference speakerphones.

The Wolfson WM9081 single chip mono DAC and speaker amplifier WM9081 benefits from an integrated high efficiency 2.6W switchable class AB/D speaker amplifier, dynamic range controller and ReTune Mobile 5 band parametric equaliser. Wolfson WM9081 single chip mono DAC and speaker amplifier achieves audio performance of 92dB SNR in Class D mode and 1% THD+N at 2.4W output power into 4? speaker loads. Compared to typical two chip solutions which use a DAC and separate class D amplifier the Wolfson WM9081 single chip mono DAC and speaker amplifier consumes approximately 30% less PCB area and achieves an average 20% BOM cost reduction.

The Wolfson WM9081 single chip mono DAC and speaker amplifier integrates a ReTune Mobile 5 band parametric equaliser with fully programmable coefficients allowing speaker frequency response compensation and music profiles to be defined by the end user. Programmable dynamic range control is integrated to help boost low-level signals to maximise volume for improved intelligibility. The Wolfson WM9081 single chip mono DAC and speaker amplifier features a limiter designed to prevent audio signal clipping and distortion, which can overload the battery and potentially damage the speakers.

A digital audio interface gives the system designer several advantages in terms of noise immunity/reduction. Digital input allows the Wolfson WM9081 single chip mono DAC and speaker amplifier to be located close to the speakers in multi-channel systems without the need for long analogue connections. By locating the driver close to the speaker the need for bulky and expensive Class D filters is removed, while PCB track lengths, which carry noisy high frequency switching currents, can be minimised.

The Wolfson WM9081 single chip mono DAC and speaker amplifier’s integrated register write sequencer helps to minimise software development time. A number of signal paths (such as DAC to speaker mode) can be enabled and disabled by one register write. To do this, the internal sequencer initiates a sequence of pre programmed multiple writes independently within the Wolfson WM9081 single chip mono DAC and speaker amplifier, offloading control interface communication between the processor and WM9081.

According to David Brown, Audio Amps Product Line Manager, Wolfson Microelectronics, with the Wolfson WM9081 single chip mono DAC and speaker amplifier, designers of portable navigation devices and other similar systems do not need to sacrifice audio performance to maximise output power. Drawing on the audio expertise, Wolfson have developed a single-chip integrated device, which enables OEMs to make savings on PCB space and BOM cost and also achieves a radically improved user experience.

The Wolfson WM9081 single chip mono DAC and speaker amplifier supports four control interface addresses and four-channel TDM to allow multiple devices to be configured and driven independently. Controlling the device is done through a standard 2-wire, 3-wire, or 4-wire control interface or by hardware control pins. The WM9081 is available for sampling now in a 28-pin COL QFN.

A full Wolfson WM9081 single chip mono DAC and speaker amplifier evaluation system is available including evaluation board, full schematics, Linux driver and Wolfson’s Interactive Set-up Configuration Environment (WISCE). The 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.

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