WM8788GEDT

w WM8788 High Performance 24-bit Stereo ADC DESCRIPTION FEATURES The WM8788 is a high performance 24-bit stereo ADC designed for LCD televisions, DVD, Blu-Ray and set-top box applications.  A stereo pair of analogue inputs is provided; external resistors are used to configure the device for line level inputs at 1Vrms or for higher input signal levels. The hi-fi ADCs output 16, 20 or 24bit stereo data on the digital audio interface. ADC sample rates from 8kHz to 192kHz are supported; Master Clock (MCLK) ratios of 128fs up to 768fs are possible (fs = sample rate). The digital audio interface operates in Master or Slave modes, and supports Right-justified, Left-justified and I2S modes, selectable using hardware control pins. The WM8788 is powered from a single 3.3V supply rail, connected to the AVDD and REFVDD pins.        Hi-fi audio ADC - 106dB SNR (‘A’ weighted - -91dB THD (-1dBFS output) - Sample rates 8kHz to 192kHz 2 analogue audio inputs - Support for line level inputs >1Vrms Digital audio interface - Master or Slave operation - 16, 20 or 24-bit data format - Right-justified, Left-justified, I2S modes Wide range of master clock (MCLK) rates - 128fs, 192fs, 256fs, 384fs, 512fs, 768fs support Hardware configuration control Integrated voltage reference circuits Single 3.3V supply 16-pin TSSOP package A power on reset (POR) circuit ensures correct start-up and shut-down. The device is held in reset when MCLK is not present, offering a low-power standby state. APPLICATIONS The WM8788 is supplied in a 16-pin TSSOP package.    LCD televisions Set-top boxes (STB) Blu-Ray / DVD players and recorders BLOCK DIAGRAM WM8788 INLFB INL ADC L BCLK Digital Filters INRFB INR AIF LRCLK ADCDAT ADC R MCLK MASTER Reference Generator Control Interface OSR AIFMODE0 AIFMODE1 VMIDC REFVDD AVDD AGND WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews Preliminary Technical Data, December 2011, Rev 2.3 Copyright 2011 Wolfson Microelectronics plc 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  CALIBRATED START-UP .............................................................................................. 10  SLAVE MODE ........................................................................................................................................... 10  MASTER MODE ........................................................................................................................................ 10  INPUT SIGNAL PATH .................................................................................................... 11  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  REVISION HISTORY ........................................................................................... 23  w PTD, December 2011, Rev 2.3 2 WM8788 Preliminary Technical Data PIN CONFIGURATION The WM8788 is supplied in a 16-pin TSSOP format. The pin configuration is illustrated below, showing the top-down view from above the chip. VMIDC 1 16 AGND INL 2 15 ADCDAT INLFB 3 14 BCLK INR 4 13 LRCLK INRFB 5 12 MCLK REFVDD 6 11 OSR AVDD 7 10 MASTER AIFMODE1 8 9 AIFMODE0 WM8788 (Top View) ORDERING INFORMATION ORDER CODE TEMPERATURE RANGE PACKAGE MOISTURE SENSITIVITY LEVEL PEAK SOLDERING TEMPERATURE WM8788GEDT -40C to +85C 16-pin TSSOP (Pb-free) MSL1 260 C WM8788GEDT/R -40C to +85C 16-pin TSSOP (Pb-free, tape and reel) MSL1 260 C o o Note: Reel quantity = 2,000 PIN DESCRIPTION PIN NO NAME 1 VMIDC 2 INL 3 INLFB 4 INR TYPE DESCRIPTION Analogue Output Midrail voltage decoupling capacitor Analogue Input Left channel analogue input Analogue Output Left channel feedback connection Analogue Input Right channel analogue input 5 INRFB Analogue Output Right channel feedback connection 6 REFVDD Supply ADC Reference Positive supply 7 AVDD Supply Analogue Positive supply 8 AIFMODE1 Digital Tri-state Input Audio interface configuration pin 1 Audio interface configuration pin 0 9 AIFMODE0 Digital Tri-state Input 10 MASTER Digital Tri-state Input Audio interface Master / Slave select 11 OSR Digital Tri-state Input ADC oversample rate select 12 MCLK Digital Input Master clock Audio interface left / right clock LRCLK Digital Input / Output 14 BCLK Digital Input / Output Audio interface bit clock 15 ADCDAT Digital Output ADC digital audio data 16 AGND Supply Ground 13 w PTD, December 2011, Rev 2.3 3 WM8788 Preliminary Technical Data ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical Characteristics at the test conditions specified. ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage of this device. Wolfson tests its package types according to IPC/JEDEC J-STD-020B for Moisture Sensitivity to determine acceptable storage conditions prior to surface mount assembly. These levels are: MSL1 = unlimited floor life at