WM8750BL w Stereo CODEC for Portable Audio Applications DESCRIPTION FEATURES DAC SNR 97dB (A weighted), THD -85dB at 48kHz, 3.3V The WM8750BL is a low power, high quality stereo CODEC ADC SNR 88dB (A weighted), THD -80dB at 48kHz, 3.3V designed for portable digital audio applications. Complete Stereo / Mono Microphone Interface The device integrates complete interfaces to stereo or mono - Programmable ALC / Noise Gate microphones and a stereo headphone. External component On-chip 400mW BTL Speaker Driver (mono) requirements are drastically reduced as no separate On-chip Headphone Driver microphone or headphone amplifiers are required. - >40mW output power on 16 / 3.3V Advanced on-chip digital signal processing performs graphic - THD 73dB at 5mW, SNR 98dB with 16 load equaliser, 3-D sound enhancement and automatic level - No DC blocking capacitors required (capless mode) control for the microphone or line input. Separately mixed mono output Digital Graphic Equaliser The WM8750BL can operate as a master or a slave, with Low Power various master clock frequencies including 12 or 24MHz for - 6 mW stereo playback (1.8V / 1.5V supplies) USB devices, or standard 256f rates like 12.288MHz and s - 13 mW record & playback (1.8V / 1.5V supplies) 24.576MHz. Different audio sample rates such as 96kHz, Low Supply Voltages 48kHz, 44.1kHz are generated directly from the master - Analogue 1.8V to 3.6V clock without the need for an external PLL. - Digital core: 1.42V to 3.6V The WM8750BL operates at supply voltages down to 1.8V, - Digital I/O: 1.8V to 3.6V although the digital core can operate at voltages down to 256fs / 384fs or USB master clock rates: 12MHz, 24MHz 1.42V to save power, and the maximum for all supplies is Audio sample rates: 8, 11.025, 16, 22.05, 24, 32, 44.1, 48, 3.6 Volts. Different sections of the chip can also be powered 88.2, 96kHz generated internally from master clock down under software control. 5x5x0.9mm QFN package The WM8750BL is supplied in a very small and thin 5x5mm APPLICATIONS QFN package, ideal for use in hand-held and portable systems. Portable Media Player Mobile phone handsets Mobile gaming BLOCK DIAGRAM Production Data, August 2012, Rev 4.1 WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at WM8750BL Production Data TABLE OF CONTENTS DESCRIPTION ................................................................................................................... 1 FEATURES ......................................................................................................................... 1 APPLICATIONS ................................................................................................................. 1 BLOCK DIAGRAM ............................................................................................................. 1 TABLE OF CONTENTS ..................................................................................................... 2 PIN CONFIGURATION ....................................................................................................... 3 ORDERING INFORMATION .............................................................................................. 3 PIN DESCRIPTION ............................................................................................................ 4 ABSOLUTE MAXIMUM RATINGS ..................................................................................... 5 RECOMMENDED OPERATION CONDITIONS ................................................................. 5 ELECTRICAL CHARACTERISTICS .................................................................................. 6 TYPICAL PERFORMANCE ................................................................................................ 8 POWER CONSUMPTION ............................................................................................................... 8 OUTPUT DRIVERS ........................................................................................................................ 9 OUTPUT PGAS LINEARITY ........................................................................................................ 10 SIGNAL TIMING REQUIREMENTS ................................................................................. 11 SYSTEM CLOCK TIMING ............................................................................................................ 11 AUDIO INTERFACE TIMING MASTER MODE ......................................................................... 11 AUDIO INTERFACE TIMING SLAVE MODE ............................................................................ 12 INTERNAL POWER ON RESET CIRCUIT ...................................................................... 15 DEVICE DESCRIPTION ................................................................................................... 16 INTRODUCTION ........................................................................................................................... 16 INPUT SIGNAL PATH ................................................................................................................... 16 AUTOMATIC LEVEL CONTROL (ALC) ........................................................................................ 23 OUTPUT SIGNAL PATH ............................................................................................................... 27 ANALOGUE OUTPUTS ................................................................................................................ 32 ENABLING THE OUTPUTS .......................................................................................................... 34 HEADPHONE SWITCH ................................................................................................................ 34 THERMAL SHUTDOWN ............................................................................................................... 35 HEADPHONE OUTPUT ................................................................................................................ 36 DIGITAL AUDIO INTERFACE ...................................................................................................... 37 AUDIO INTERFACE CONTROL ................................................................................................... 41 CLOCKING AND SAMPLE RATES .............................................................................................. 43 CONTROL INTERFACE ............................................................................................................... 45 POWER SUPPLIES ...................................................................................................................... 46 POWER MANAGEMENT .............................................................................................................. 46 REGISTER MAP ............................................................................................................... 49 DIGITAL FILTER CHARACTERISTICS ........................................................................... 50 TERMINOLOGY ............................................................................................................................ 50 DAC FILTER RESPONSES .......................................................................................................... 51 ADC FILTER RESPONSES .......................................................................................................... 52 DE-EMPHASIS FILTER RESPONSES ........................................................................................ 53 HIGHPASS FILTER ...................................................................................................................... 54 APPLICATIONS INFORMATION ..................................................................................... 55 RECOMMENDED EXTERNAL COMPONENTS .......................................................................... 55 LINE INPUT CONFIGURATION ................................................................................................... 56 MICROPHONE INPUT CONFIGURATION .................................................................................. 56 MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS ........................................................ 56 POWER MANAGEMENT EXAMPLES ......................................................................................... 57 IMPORTANT NOTICE ...................................................................................................... 59 ADDRESS ..................................................................................................................................... 59 REVISION HISTORY ........................................................................................................ 60 PD, Rev 4.1, August 2012 w 2