WM8781 w 24-Bit, 192kHz Stereo ADC DESCRIPTION FEATURES SNR 102dB (A weighted 48kHz) The WM8781 is a high performance, low cost stereo audio THD -90dB (at 1dB) ADC designed for recordable media applications. Sampling Frequency: 8 192kHz The device offers stereo line level inputs along with two Master or Slave Clocking Mode control input pins (FORMAT, IWL) to allow operation of the System Clock (MCLK): 128fs, 192fs, 256fs, 384fs, 512fs, 768fs audio interface in three industry standard modes. An Audio Data Interface Modes 2 internal op-amp is integrated on the front end of the chip to - 16-24 bit I S, 16-24 bit Left, 16-24 bit Right Justified accommodate analogue input signals greater than 1V . rms Supply Voltages The device also has a high pass filter to remove residual - Analogue 2.7 to 5.5V DC offsets. - Digital core: 2.7V to 3.6V 20-lead SSOP package WM8781 offers Master or Slave mode clocking schemes. A control input pin M/S is used to allow Slave mode APPLICATIONS operation or Master mode operation. A stereo 24-bit multi- bit sigma-delta ADC is used with 128x, 64x or 32x over- Recordable DVD Players sampling, according to sample rate. Digital audio output Personal Video Recorders word lengths from 16-24 bits and sampling rates from 8kHz STB to 192kHz are supported. Studio Audio Processing Equipment The device is a hardware controlled device and is supplied in a 20-lead SSOP package. BLOCK DIAGRAM Production Data, January 2012, Rev 4.5 WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at WM8781 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 THERMAL PERFORMANCE ................................................................................. 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 DIAGRAM ......................................................................................... 19 IMPORTANT NOTICE ......................................................................................... 20 ADDRESS: ..................................................................................................................... 20 PD, January 2012, Rev 4.5 w 2