WM9082 Datasheet, PDF (1/24 Pages) Wolfson Microelectronics plc – PDM Input Mono 3W Class D Speaker Driver

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WM9082
PDM Input Mono 3W Class D Speaker Driver
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.
FEATURES
 Sigma-Delta Class-D speaker driver
- 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