Multimedia DAC

w DESCRIPTION The WM8986 is a low power, high quality, feature-rich stereo DAC designed for portable multimedia applications that require low power consumption and high quality audio. The device integrates preamps for stereo differential mics, and includes class D and class AB drivers for headphone and differential or stereo line output. External component requirements are reduced as no separate microphone or headphone amplifiers are required. Advanced DSP features include a 5-band equaliser and a digital playback limiter. Highly flexible mixers enable many new application features, with the option to playback any combination of voice, line inputs and digital audio such as FM Radio or MP3. The WM8986 digital audio interface can operate in master or slave mode, while an integrated PLL provides flexible clocking schemes. WM8986 Multimedia DAC With Class D Headphone and Line Out FEATURES Stereo DAC: • DAC SNR 98dB, THD -86dB (‘A’ weighted @ 48kHz) • Headphone driver with ‘capless’ option - 40mW/channel output power into 16Ω / 3.3V AVDD2 - Class D headphone driver - Class AB headphone / line Driver - PSRR 70dB at 217Hz • Stereo, mono or differential line output Mic Preamps: • Stereo differential or mono microphone interfaces • Programmable preamp gain • Pseudo differential inputs with common mode rejection Other Features: • Enhanced 3-D function for improved stereo separation • Digital playback limiter • 5-band Equaliser • Aux inputs for stereo analog input signals or ‘beep’ The WM8986 operates at analogue supply voltages from 2.5V • PLL supporting various clocks between 8MHz-50MHz to 3.3V, although the digital core can operate at voltages down • Sample rates supported (kHz): 8, 11.025, 16, 12, 16, 22.05, to 1.71V to save power. Additional power management control 24, 32, 44.1, 48 enables individual sections of the chip to be powered down • Low power, low voltage www.DataSheet4U.com under software control. • 2.5V to 3.6V analogue supplies • 1.71V to 3.6V digital supplies • 4x4mm 28-lead COL QFN package APPLICATIONS • • Portable audio player / FM radio Multimedia Mobile Handsets WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Pre-Production, February 2007, Rev 3.1 Copyright ©2007 Wolfson Microelectronics plc WM8986 BLOCK DIAGRAM Pre-Production w PP, Rev 3.1, February 2007 2 Pre-Production WM8986 TABLE OF CONTENTS DESCRIPTION .......................................................................................................1 FEATURES.............................................................................................................1 APPLICATIONS .....................................................................................................1 BLOCK DIAGRAM .................................................................................................2 TABLE OF CONTENTS .........................................................................................3 PIN CONFIGURATION...........................................................................................4 ORDERING INFORMATION ..................................................................................4 PIN DESCRIPTION ................................................................................................5 ABSOLUTE MAXIMUM RATINGS.........................................................................6 RECOMMENDED OPERATING CONDITIONS .....................................................6 ELECTRICAL CHARACTERISTICS ......................................................................7 TERMINOLOGY .......................................................................................................... 11 AUDIO PATHS OVERVIEW .................................................................................12 SIGNAL TIMING REQUIREMENTS .....................................................................14 SYSTEM CLOCK TIMING ........................................................................................... 14 AUDIO INTERFACE TIMING – MASTER MODE ........................................................ 14 AUDIO INTERFACE TIMING – SLAVE MODE............................................................ 15 CONTROL INTERFACE TIMING – 3-WIRE MODE .................................................... 16 CONTROL INTERFACE TIMING – 2-WIRE MODE .................................................... 17 INTERNAL POWER ON RESET CIRCUIT ..........................................................18 RECOMMENDED POWER UP/DOWN SEQUENCE .................................................. 20 DEVICE DESCRIPTION.......................................................................................22 INTRODUCTION ......................................................................................................... 22 INPUT SIGNAL PATH ................................................................................................. 23 OUTPUT SIGNAL PATH ............................................................................................. 31 3D STEREO ENHANCEMENT .................................................................................... 37 ANALOGUE OUTPUTS............................................................................................... 37 DIGITAL AUDIO INTERFACES................................................................................... 50 AUDIO SAMPLE RATES ............................................................................................. 54 MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ............................................... 55 COMPANDING............................................................................................................ 57 GENERAL PURPOSE INPUT/OUTPUT...................................................................... 59 OUTPUT SWITCHING (JACK DETECT)..................................................................... 60 CONTROL INTERFACE.............................................................................................. 61 RESETTING THE CHIP .............................................................................................. 62 POWER SUPPLIES .................................................................................................... 62 POWER MANAGEMENT ............................................................................................ 63 REGISTER MAP...................................................................................................64 REGISTER BITS BY ADDRESS ................................................................................. 66 DAC DIGITAL FILTER CHARACTERISTICS ......................................................79 TERMINOLOGY .......................................................................................................... 79 DAC FILTER RESPONSES......................................................................................... 80 5-BAND EQUALISER .................................................................................................. 81 APPLICATIONS INFORMATION .........................................................................85 RECOMMENDED EXTERNAL COMPONENTS .......................................................... 85 PACKAGE DIAGRAM ..........................................................................................86 IMPORTANT NOTICE ..........................................................................................87 ADDRESS: .................................................................................................................. 87 w PP, Rev 3.1, February 2007 3 WM8986 PIN CONFIGURATION Pre-Production ORDERING INFORMATION ORDER CODE WM8986GECO/V WM8986GECO/RV Note: Reel quantity = 3,500 TEMPERATURE RANGE -25°C to +85°C -25°C to +85°C PACKAGE 28-lead COL QFN (4 x 4 mm) (Pb-free) 28-lead COL QFN (4 x 4 mm) (Pb-free, tape and reel) MOISTURE SENSITIVITY LEVEL MSL3 MSL3 PEAK SOLDERING TEMPERATURE 260oC 260oC w PP, Rev 3.1, February 2007 4 Pre-Production WM8986 PIN DESCRIPTION PIN 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 NAME LIP LIN RIP RIN DACDAT LRC BCLK MCLK DGND DCVDD DBVDD CSB/GPIO1 SCLK SDIN MODE AUXL AUXR OUT4 OUT3 ROUT2 AGND2 LOUT2 AVDD2 VMID AGND1 ROUT1 LOUT1 AVDD1 TYPE Analogue input Analogue input Analogue input Analogue input Digital Input Digital Input / Output Digital Input / Output Digital Input Supply Supply Supply Digital Input / Output Digital Input Digital Input / Output Digital Input Analogue input Analogue input Analogue Output Analogue Output Analogue Output Supply Analogue Output Supply Reference Supply Analogue Output Analogue Output Supply DESCRIPTION Left MIC pre-amp positive input Left MIC pre-amp negative input Right MIC pre-amp positive input Right MIC pre-amp negative input DAC digital audio data input DAC sample rate clock Digital audio bit clock Master clock input Digital ground Digital core logic supply Digital buffer (I/O) supply 3-Wire control interface chip Select / GPIO1 pin 3-Wire control interface clock input / 2-wire control interface clock input 3-Wire control interface data input / 2-Wire control interface data input Control interface selection Left auxiliary input Right auxiliary input Buffered midrail headphone pseudo-ground / right line output / mono mix output Buffered midrail headphone pseudo-ground or left line output Class D or class AB headphone output right Analogue ground (ground reference for ROUT2/LOUT2 and OUT3/OUT4) Class D or class AB headphone output left Analogue supply (feeds output amplifiers ROUT2/LOUT2 and OUT3/OUT4) Decoupling for DAC reference voltage Analogue ground (ground reference for all input amplifiers, PLL, DAC, interna bias circuits, output amplifiers LOUT1, ROUT1) Class AB headphone or line output right Class AB headphone or line output left Analogue supply (feeds all inpu