WM8781GEDR

w 24-Bit, 192kHz Stereo ADC DESCRIPTION The WM8781 is a high performance, low cost stereo audio ADC designed for recordable media applications. The device offers stereo line level inputs along with two control input pins (FORMAT, IWL) to allow operation of the audio interface in three industry standard modes. An internal op-amp is integrated on the front end of the chip to accommodate analogue input signals greater than 1Vrms. The device also has a high pass filter to remove residual DC offsets. WM8781 offers Master or Slave mode clocking schemes. A control input pin M/S is used to allow Slave mode operation or Master mode operation. A stereo 24-bit multibit sigma-delta ADC is used with 128x, 64x or 32x oversampling, according to sample rate. Digital audio output word lengths from 16-24 bits and sampling rates from 8kHz to 192kHz are supported. The device is a hardware controlled device and is supplied in a 20-lead SSOP package. WM8781 FEATURES • • • • • • • • SNR 102dB (‘A’ weighted @ 48kHz) THD -90dB (at –1dB) Sampling Frequency: 8 – 192kHz Master or Slave Clocking Mode System Clock (MCLK): 128fs, 192fs, 256fs, 384fs, 512fs, 768fs Audio Data Interface Modes - 16-24 bit I2S, 16-24 bit Left, 16-24 bit Right Justified Supply Voltages - Analogue 2.7 to 5.5V - Digital core: 2.7V to 3.6V 20-lead SSOP package APPLICATIONS • • • • Recordable DVD Players Personal Video Recorders STB Studio Audio Processing Equipment BLOCK DIAGRAM WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Production Data, April 2006, Rev 4.1 Copyright 2006 Wolfson Microelectronics plc WM8781 TABLE OF CONTENTS Production Data DESCRIPTION .......................................................................................................1 FEATURES.............................................................................................................1 APPLICATIONS .....................................................................................................1 BLOCK DIAGRAM .................................................................................................1 TABLE OF CONTENTS .........................................................................................2 PIN CONFIGURATION...........................................................................................3 ORDERING INFORMATION ..................................................................................3 ABSOLUTE MAXIMUM RATINGS.........................................................................5 RECOMMENDED OPERATING CONDITIONS .....................................................5 ELECTRICAL CHARACTERISTICS ......................................................................6 TERMINOLOGY............................................................................................................. 7 SIGNAL TIMING REQUIREMENTS .......................................................................8 DEVICE DESCRIPTION.......................................................................................10 INTRODUCTION.......................................................................................................... 10 ADC ............................................................................................................................. 10 ADC DIGITAL FILTER ................................................................................................. 10 DIGITAL AUDIO INTERFACE...................................................................................... 11 POWER DOWN CONTROL......................................................................................... 14 POWER ON RESET .................................................................................................... 14 DIGITAL FILTER CHARACTERISTICS ...............................................................16 ADC FILTER RESPONSES ......................................................................................... 16 ADC HIGH PASS FILTER............................................................................................ 17 APPLICATIONS INFORMATION .........................................................................18 RECOMMENDED EXTERNAL COMPONENTS........................................................... 18 RECOMMENDED EXTERNAL COMPONENTS VALUES............................................ 18 PACKAGE DIMENSIONS ....................................................................................19 IMPORTANT NOTICE ..........................................................................................20 ADDRESS:................................................................................................................... 20 w PD, April 2006, Rev 4.1 2 Production Data WM8781 PIN CONFIGURATION MCLK DOUT LRCLK DGND DVDD BCLK IWL FSAMPEN FORMAT VMID 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 M/S AINL AINOPL COM AINR AINOPR AGND AVDD VREFP VREFGND ORDERING INFORMATION DEVICE W M8781GEDS W M8781GEDS/R Note: Reel quantity = 2,000 TEMPERATURE RANGE -25°C to +85°C -25°C to +85°C PACKAGE 20-lead SSOP (Pb-free) 20-lead SSOP (Pb-free, tape and reel) MOISTURE SENSITIVITY LEVEL MSL1 MSL1 PEAK SOLDERING TEMPERATURE 260oC 260oC w PD, April 2006, Rev 4.1 3 WM8781 PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 7 NAME MCLK DOUT LRCLK DGND DVDD BCLK IWL TYPE Digital Input Digital Output Digital Input / Output Supply Supply Digital Input / Output Digital Tristate Input Master Clock ADC Digital Audio Data Audio Interface Left / Right Clock Digital Negative Supply Digital Positive Supply Audio Interface Bit Clock Word Length 0 = 16 bit 1 = 20 bit Z = 24 bit Fast Sampling Rate Enable 0 = 48kHz enable 1 = 96kHz enable Z = 192kHz enable Audio Mode Select 0 = RJ 1 = LJ Z = I2S Midrail Voltage Decoupling Capacitor Negative Supply and Substrate Connection DESCRIPTION Production Data 8 FSAMPEN Digital Tristate Input 9 FORMAT Digital Tristate Input 10 11 12 13 14 15 16 17 18 19 20 VMID VREFGND VREFP AVDD AGND AINOPR AINR COM AINOPL AINL M/S Analogue Output Supply Analogue Output Supply Supply Analogue Output Analogue Input Analogue Input Analogue Output Analogue Input Digital Input Positive Reference Voltage Decoupling Pin; 10uF external decoupling Analogue Positive Supply Analogue Negative Supply and Substrate Connection Right Channel Internal Op-Amp Output Right Channel Input Common mode high impedance input should be set to midrail. Left Channel Internal Op-Amp Output Left Channel Input Interface Mode Select 0 = Slave mode (128fs, 192fs, 256fs, 384fs, 512fs, 768fs) 1 = Master mode (384fs, 192fs) (fs=word clock frequency) w PD, April 2006, Rev 4.1 4 Production Data WM8781 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