WM1824 w 24-bit 192kHz Stereo DAC with 2Vrms Ground Referenced Line Output DESCRIPTION FEATURES High performance stereo DAC with ground referenced line The WM1824 is a stereo DAC with integral charge pump. driver This provides 2Vrms line driver outputs using a single 3.3V Audio Performance power supply rail. 106dB SNR (A-weighted) The device features ground-referenced outputs and the use -89dB THD -1dBFS of a DC servo to eliminate the need for line driving coupling 120dB mute attenuation capacitors and effectively eliminate power on pops and All common sample rates from 8kHz to 192kHz supported clicks. Hardware control mode 2 Data formats: LJ, I S The device is controlled and configured via a hardware Maximum 1mV DC offset on Line Outputs control interface. Pop/Click suppressed Power Up/Down Sequencer The device supports all common audio sampling rates AVDD, LINEVDD and DBVDD can operate at +3.3V 10% between 8kHz and 192kHz using all common MCLK fs allowing single supply rates. The audio interface operates in slave mode. 24-lead QFN package Operating temperature range: -40C to 85C The WM1824 has a 3.3V tolerant digital interface, allowing logic up to 3.3V to be connected. APPLICATIONS The device is available in a 24-pin QFN. Consumer digital audio applications requiring 2Vrms output Games Consoles Set Top Box A/V Receivers DVD Players Digital TV BLOCK DIAGRAM WOLFSON MICROELECTRONICS plc Production Data, December 2011, Rev 4.1 Copyright 2011 Wolfson Microelectronics plc WM1824 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 RECOMMENDED OPERATING CONDITIONS ..................................................... 5 ELECTRICAL CHARACTERISTICS ..................................................................... 6 TERMINOLOGY .............................................................................................................. 6 POWER CONSUMPTION MEASUREMENTS ................................................................ 7 SIGNAL TIMING REQUIREMENTS ...................................................................... 8 SYSTEM CLOCK TIMING ............................................................................................... 8 AUDIO INTERFACE TIMING SLAVE MODE ............................................................... 9 POWER ON RESET CIRCUIT ...................................................................................... 10 DEVICE DESCRIPTION ...................................................................................... 12 INTRODUCTION ........................................................................................................... 12 DIGITAL AUDIO INTERFACE ....................................................................................... 12 DIGITAL AUDIO DATA SAMPLING RATES ................................................................. 13 POWER DOMAINS ....................................................................................................... 16 DIGITAL FILTER CHARACTERISTICS .............................................................. 17 DAC FILTER RESPONSES .......................................................................................... 18 APPLICATIONS INFORMATION ........................................................................ 19 RECOMMENDED EXTERNAL COMPONENTS ........................................................... 19 RECOMMENDED ANALOGUE LOW PASS FILTER .................................................... 20 RELEVANT APPLICATION NOTES .............................................................................. 20 PACKAGE DIMENSIONS .................................................................................... 21 IMPORTANT NOTICE ................................................................................................... 22 ADDRESS ..................................................................................................................... 22 REVISION HISTORY ........................................................................................... 23 PD, Rev 4.1, December 2011 w 2