WM8788 w High Performance 24-bit Stereo ADC DESCRIPTION FEATURES Hi-Fi audio ADC The WM8788 is a high performance 24-bit stereo ADC - 106dB SNR (A weighted designed for LCD televisions, DVD, Blu-Ray and set-top box - -91dB THD (-1dBFS output) applications. - Sample rates 8kHz to 192kHz A stereo pair of analogue inputs is provided external resistors 2 analogue audio inputs are used to configure the device for line level inputs at 1Vrms or - Support for line level inputs >1Vrms for higher input signal levels. The Hi-Fi ADCs output 16, 20 or Digital audio interface 24-bit stereo data on the digital audio interface. - Master or Slave operation - 16, 20 or 24-bit data format ADC sample rates from 8kHz to 192kHz are supported Master - Right-justified, Left-justified, I2S modes Clock (MCLK) ratios of 128fs up to 768fs are possible (fs = Wide range of master clock (MCLK) rates sample rate). - 128fs, 192fs, 256fs, 384fs, 512fs, 768fs support The digital audio interface operates in Master or Slave modes, Hardware configuration control and supports Right-justified, Left-justified and I2S modes, Integrated voltage reference circuits selectable using hardware control pins. Single 3.3V supply 16-pin TSSOP package The WM8788 is powered from a single 3.3V supply rail, connected to the AVDD and REFVDD pins. A power on reset (POR) circuit ensures correct start-up and APPLICATIONS shut-down. The device is held in reset when MCLK is not present, offering a low-power standby state. LCD televisions Set-top boxes (STB) The WM8788 is supplied in a 16-pin TSSOP package. Blu-Ray / DVD players and recorders BLOCK DIAGRAM WM8788 INLFB INL ADC L BCLK Digital AIF LRCLK Filters INRFB ADCDAT INR ADC R MCLK MASTER Reference Generator Control OSR Interface AIFMODE0 AIFMODE1 VMIDC REFVDD AVDD AGND Preliminary Technical Data, December 2010, Rev 2.2 WOLFSON MICROELECTRONICS plc Copyright 2010 Wolfson Microelectronics plc To receive regular email updates, sign up at WM8788 Preliminary Technical 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 ................................................................................................ 3 ABSOLUTE MAXIMUM RATINGS ......................................................................... 4 RECOMMENDED OPERATING CONDITIONS ..................................................... 4 THERMAL PERFORMANCE ................................................................................. 5 ELECTRICAL CHARACTERISTICS ...................................................................... 6 TERMINOLOGY ............................................................................................................. 7 SIGNAL TIMING REQUIREMENTS ....................................................................... 8 SYSTEM CLOCK TIMING .............................................................................................. 8 AUDIO INTERFACE TIMING ......................................................................................... 9 MASTER MODE .......................................................................................................................................... 9 SLAVE MODE ............................................................................................................................................. 9 DEVICE DESCRIPTION ....................................................................................... 10 INTRODUCTION .......................................................................................................... 10 INPUT SIGNAL PATH .................................................................................................. 10 ANALOGUE-TO-DIGITAL CONVERTER (ADC) .......................................................... 12 DIGITAL AUDIO INTERFACE ...................................................................................... 12 DIGITAL AUDIO INTERFACE CONTROL ................................................................................................. 13 MASTER AND SLAVE MODE OPERATION ............................................................................................. 14 AUDIO DATA FORMATS .......................................................................................................................... 14 DIGITAL FILTER CHARACTERISTICS ............................................................... 16 ADC FILTER RESPONSE ............................................................................................ 16 APPLICATIONS INFORMATION ......................................................................... 18 RECOMMENDED EXTERNAL COMPONENTS ........................................................... 18 AUDIO INPUT PATHS ............................................................................................................................... 18 POWER SUPPLY DECOUPLING ............................................................................................................. 18 RECOMMENDED EXTERNAL COMPONENTS DIAGRAM ...................................................................... 19 PCB LAYOUT CONSIDERATIONS .............................................................................. 20 PACKAGE DIMENSIONS .................................................................................... 21 IMPORTANT NOTICE .......................................................................................... 22 ADDRESS: ................................................................................................................... 22 PTD, December 2010, Rev 2.2 w 2