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DESCRIPTION
The WM9082 is a high-performance sigma-delta Class D
speaker driver. Audio input is supported using a stereo PDM
interface; clock and control-code detection circuitry supports
all of the audio and control functions via a 2-wire interface.
The digital audio interface provides excellent noise
immunity, eliminating traditional input-filtering components.
The flexible 2-wire interface minimises the PCB footprint and
simplifies software development.
The combined audio and control interface configuration is
ideal for enabling the WM9082 to be located close to the
speaker; this reduces the length of the output connections,
giving good EMC performance and removing the need for
output filter components.
The sigma-delta architecture provides good power efficiency
and improved EMI performance with respect to traditional
PWM Class D designs.
A first-order high-pass filter can be selected on the input
signal to remove DC offsets and help to prevent speaker
damage. Other features include a low-power mute state,
and output slew-rate control.
Short-circuit and thermal protection is provided.
The WM9082 is supplied in a 9-ball 1.56 x 1.46mm CSP
package, with 0.5mm ball pitch.
WM9082
PDM Input Mono 3W Class D Speaker Driver
FEATURES
Sigma-Delta Class-D speaker driver
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92dB SNR - ‘A’ weighted
2.5W into 4 (5V supply, 1% THD)
1.3W into 4 (3.6V supply, 1% THD)
1.25W into 8 (5V supply, 1% THD)
650mW into 8 (3.6V supply, 1% THD
Stereo PDM digital audio input
Supports 32kHz, 44.1kHz, 48kHz sample rates (128fs input)
Automatic Left/Right channel selection
First-order high pass filter (HPF)
RF noise suppression
Pop and click suppression
Programmable output slew rates for low EMI
Short-circuit and thermal protection
9-ball CSP package
APPLICATIONS
Mobile Handsets
Portable Media Players (PMP)
Notebooks / Laptop computers
LCD televisions
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
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Production Data, August 2012, Rev 4.1
Copyright
2012
Wolfson Microelectronics plc
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
