WM8782 w 24-Bit, 192kHz Stereo ADC DESCRIPTION FEATURES SNR 100dB (A weighted 48kHz) The WM8782 is a high performance, low cost stereo audio ADC designed for recordable media applications. THD -93dB (at 1dB) 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 audio interface in three industry standard modes. An System Clock (MCLK): 128fs, 192fs, 256fs, 384fs, 512fs, internal op-amp is integrated on the front end of the chip to 768fs accommodate analogue input signals greater than 1V . rms - Audio Data Interface Modes The device also has a high pass filter to remove residual 2 16-24 bit I S, 16-24 bit Left, 16-24 bit Right Justified DC offsets. Supply Voltages WM8782 offers Master or Slave mode clocking schemes. - Analogue: 2.7 to 5.5V A control input pin M/S is used to allow Slave mode - Digital core: 2.7V to 3.6V operation or Master mode operation. A stereo 24-bit multi- 20-lead SSOP or 20-lead TSSOP package bit sigma-delta ADC is used with 128x, 64x or 32x over- Accelerated Lifetime Screened Devices available. sampling, according to sample rate. Digital audio output word lengths from 16-24 bits and sampling rates from 8kHz APPLICATIONS to 192kHz are supported. The device is a hardware controlled device and is supplied Recordable DVD Players in a 20-lead SSOP package. Personal Video Recorders STB The device is available over a functional temperature range of Studio Audio Processing Equipment -40 C to +85C Automotive BLOCK DIAGRAM Production Data, April 2010, Rev 4.7 WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at WM8782 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 ..................................................... 6 ELECTRICAL CHARACTERISTICS ..................................................................... 6 TERMINOLOGY ............................................................................................................... 7 SIGNAL TIMING REQUIREMENTS ...................................................................... 8 SYSTEM CLOCK TIMING ................................................................................................ 8 AUDIO INTERFACE TIMING MASTER MODE ............................................................ 8 AUDIO INTERFACE TIMING SLAVE MODE ................................................................ 9 SLAVE MODE MCLK / BCLK TIMING ........................................................................... 10 DEVICE DESCRIPTION ...................................................................................... 11 INTRODUCTION ............................................................................................................ 11 ADC ................................................................................................................................ 11 ADC DIGITAL FILTER ................................................................................................... 11 DIGITAL AUDIO INTERFACE ........................................................................................ 12 POWER ON RESET ...................................................................................................... 15 DIGITAL FILTER CHARACTERISTICS .............................................................. 17 ADC FILTER RESPONSES ........................................................................................... 17 ADC HIGH PASS FILTER .............................................................................................. 18 APPLICATIONS INFORMATION ........................................................................ 19 RECOMMENDED EXTERNAL COMPONENTS ............................................................ 19 RECOMMENDED EXTERNAL COMPONENTS VALUES ............................................. 19 PACKAGE DIMENSIONS .................................................................................... 20 20 PIN SSOP ................................................................................................................. 20 20 PIN TSSOP ............................................................................................................... 21 IMPORTANT NOTICE ......................................................................................... 21 ADDRESS: ..................................................................................................................... 21 PD, April 2010, Rev 4.7 w 2