WM8608 datasheet(15/54 Pages) WOLFSON

15 / 54 page

Product Preview

WM8608

PP Rev 1.5 March 2004

DEVICE DESCRIPTION

INTRODUCTION

The WM8608 is a high-performance multi-channel Pulse-Width Modulation (PWM) digital power

amplifier controller. The device accepts up to 7.1 channels of audio in PCM input format, and outputs

six PWM full-bandwidth channels, plus a PWM sub-woofer channel. The outputs are suitable for

directly driving integrated switching output stages available from a number of vendors. The device is

also compatible with discrete MOSFET output stages. In both cases, Wolfson Microelectronics offer

Reference Designs for complete PWM digital power amplifiers, providing high-performance low-cost

solutions ideal for Surround Sound AV Processors and DVD Receivers.

The WM8608 has a configurable input processor which accepts either Stereo, 5.1, 6.1 or 7.1

channels of PCM audio and outputs Stereo, 2.1, 5.1 or 6.1 outputs. This is done by mixing rear

channel data into centre rear or surround output channels, as required. If 5.1 channel data is input,

the surround data may be processed to create the rear-centre output.

The device has a Bass Management function, which has low-pass and high-pass filters for feeding

the sub channel and main output channels. It also provides selectable boost for the LFE channel.

Each channel can be configured to drive either “large” full-range speakers or “small” satellite

speakers with limited bass capability.

A Tone Control function is provided, plus selectable high frequency equalisation to compensate for

different loudspeaker characteristics. Independent volume control is provided for all channels, with

comprehensive mute features.

A Dynamic Peak Compressor with programmable attack and decay times is included, which allows

headroom for tone control, bass management and extra digital gain to be provided, without clipping

occurring.

The device is controlled via a 2/3 wire serial interface. The interface provides access to all features

including channel selection, volume controls, mute, de-emphasis and power management facilities.

SIGNAL PATH

The WM8606 receives digital input data via an 8-channel digital audio interface. The data is

processed in turn by the Input Processor, Bass Management and Equalisation, Volume Control and

Dynamic Peak Compressors, Interpolation Filters, and PCM-PWM Converters, as shown in Figure 7.

The PWM signals are output via selectable LVDS/CMOS drivers.

Figure 7 Signal Processing Block Diagram

Volume Control / Dynamic

Peak Compressors

PCM - PWM Converter

Interpolation Filters

Input Processor

Bass Management and

Equalisation

CMOS / LVDS Output

8 Channel Input

WM8608 Datasheet(PDF) 15 Page - Wolfson Microelectronics plc

WM8608 Datasheet(HTML) 15 Page - Wolfson Microelectronics plc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54

Datasheet Download

Link URL