WM8746

w DESCRIPTION W M8746 is a high performance 6-channel DAC designed for audio applications such as DVD, home theatre systems, and digital TV. The WM8746 supports data input word lengths from 16 to 32-bits and sampling rates up to 192kHz. The WM8746 can convert up to 6 channels at sample rates from 8 to 192kHz. Additionally WM8746 supports 2 channels at 192kHz and 4 channels at 96kHz simultaneously. The WM8746 consists of a serial interface port, digital interpolation filters, multi-bit sigma delta modulators and 6 DACs in a small 28-pin SSOP package. The WM8746 also includes a digitally controllable mute and attenuator function on each channel. The WM8746 supports a variety of connection schemes for audio DAC control. The serial control interface provides access to a wide range of features including on-chip mute, attenuation and phase reversal. A hardware controllable interface is also available. It is pin-compatible with the WM8736, (apart from RSTB pin which is typically unused). The WM8746 is an ideal device to interface to AC-3, DTS, and MPEG audio decoders for surround sound applications, or for use in “universal” high definition audio players supporting DVD-A formats. WM8746 24-bit, 192kHz 6-Channel DAC with Volume Control FEATURES • • 6-Channel DAC Audio Performance − 106dB SNR (‘A’ weighted @ 48kHz) DAC − -95dB THD DAC Sampling Frequency: 8kHz – 192kHz 3-Wire Serial Control Interface Programmable Audio Data Interface Modes − • • • • • I2S, Left, Right Justified or DSP − 16/20/24/32 bit Word Lengths Independent Digital Volume Control on Each Channel with 127.5dB Range in 0.5dB Steps 3.0V – 5.5V Supply Operation 28-Pin SSOP Package Exceeds Dolby Class A Performance Requirements Pin Compatible with WM8736 • • • APPLICATIONS • • • DVD and DVD ‘Universal’ Players Home theatre systems Digital broadcast receivers BLOCK DIAGRAM SCKI ML/I2S MC/IWL MD/DM MODE MUTE WM8746 CONTROL INTERFACE ATC DEEMPH BCP PDWN PL[3:0] IWL[1:0] MUTE UPDATE LxA[23:0] LRP RxA[23:0] FMT[1:0] PDWN PDWN PDWN L0A[7:0] Digital Filter Sigma Delta Modulator Stereo DAC OUT0L GR0 OUT0R BCKIN LRCIN LRCIN2 R0A[7:0] L1A[7:0] AUDIO INTERFACE DAC CHANNEL CONTROL R1A[7:0] DIN0 DIN1 DIN2 L2A[7:0] Digital Filter Sigma Delta Modulator Stereo DAC OUT1L GR1 OUT1R Digital Filter Sigma Delta Modulator Stereo DAC OUT2L GR2 OUT2R R2A[7:0] DVDD DGND AGND1 AGND2 AVDD1 AVDD2 CAP W OLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ Production Data, March 2006, Rev 4.0 Copyright 2006 Wolfson Microelectronics plc WM8746 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 DC ELECTRICAL CHARACTERISTICS ........................................................................ 6 AC ELECTRICAL CHARACTERISTICS ........................................................................ 6 TERMINOLOGY ............................................................................................................ 7 MASTER CLOCK TIMING ............................................................................................. 8 DIGITAL AUDIO INTERFACE TIMING.......................................................................... 8 DIGITAL CONTROL INTERFACE ................................................................................. 9 DEVICE DESCRIPTION.......................................................................................10 INTRODUCTION ......................................................................................................... 10 AUDIO DATA SAMPLING RATES............................................................................... 10 DIGITAL AUDIO INTERFACE ..................................................................................... 11 MODES OF OPERATION ........................................................................................... 14 SOFTWARE CONTROL MODES................................................................................ 15 HARDWARE CONTROL MODES ............................................................................... 21 SOFTWARE CONTROL INTERFACE......................................................................... 22 REGISTER MAP...................................................................................................23 DAC FILTER RESPONSES .................................................................................26 DIGITAL DE-EMPHASIS CHARACTERISTICS ...................................................27 RECOMMENDED EXTERNAL COMPONENTS ..................................................28 RECOMMENDED EXTERNAL COMPONENTS VALUES ........................................... 28 DECOUPLING APPLICATIONS INFORMATION ................................................29 SUPPLY PINS DESCRIPTION.................................................................................... 29 DC ELECTRICAL CHARACTERISTICS ...................................................................... 29 DECOUPLING EXAMPLES......................................................................................... 29 RECOMMENDED ANALOGUE LOW-PASS FILTER (OPTIONAL) ....................30 PACKAGE DIMENSIONS ....................................................................................31 IMPORTANT NOTICE ..........................................................................................32 ADDRESS: .................................................................................................................. 32 w March 2006, PD Rev 4.0 2 WM8746 PIN CONFIGURATION Production Data ORDERING INFORMATION DEVICE W M8746SEDS W M8746SEDS/R Note: Reel quantity = 2,000 TEMPERATURE RANGE -25 to +85oC -25 to +85oC PACKAGE 28-lead SSOP (Pb-free) 28-lead SSOP (Pb-free, tape and reel) MSL1 260°C MOISTURE SENSITIVITY LEVEL MSL1 PEAK SOLDERING TEMPERATURE 260°C w March 2006, PD Rev 4.0 3 WM8746 PIN DESCRIPTION PIN 1 2 3 4 5 6 7 8 NAME DVDD SCKI BCKIN LRCIN DIN0 DIN1 DIN2 MODE TYPE Supply Digital input Digital input Digital input Digital input Digital input Digital input Digital input Internal pull-up Digital bidirectional Digital Positive Supply. System Clock Input Audio Data Bit Clock Input. DAC Sample Rate Clock Input Channel 0 Serial Audio Data Input. Channel 1 Serial Audio Data Input. Channel 2 Serial Audio Data Input. Control Method Selection Pin. Low = Software Mode High = Hardware Control Mode Mute Control Pin in PCM Mode. Input Low: Not Mute High: Mute Z: Automute 10 11 12 LRCIN2 DGND ML/I2S Digital input Internal pull-down Supply Digital input Internal pull-up Digital input Internal pull-up Digital input Supply Analogue output Analogue output Analogue input Analogue output Supply Analogue output Analogue input Analogue output Supply Analogue output Analogue input Analogue output Supply DESCRIPTION Production Data 9 MUTE Output (Automute Enabled) Low: Mute Off High: Mute On (Zero Flag) 2nd LRCIN for use in mixed 192kHz/96kHz operation (bit 2SPD = ‘hi’) Digital GND Software mode: 3-Wire Serial Control Latch Hardware Mode: Input Format Selection: Software Mode: 3-Wire Serial Control Clock Input Hardware mode: Input Word Length Selection: Software mode: 3-Wire Serial Control Data Input Hardware mode: De-emphasis selection Analogue Positive DAC Reference Analogue Internal Mid-Rail Reference De-Coupling Point Left Channel 2 Output. Channel 2 Negative Reference. Right Channel 2 Output. Analogue GND Left Channel 1 Output. Channel 1 Negative Reference. Right Channel 1 Output. Analogue GND Left Channel 0 Output. Channel 0 Negative Reference. Right Channel 0 Output. Analogue VDD 13 MC/IWL 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Note: 1. MD/DM AVDD2 CAP OUT2L GR2 OUT2R AGND1 OUT1L GR1 OUT1R AGND2 OUT0L GR0 OUT0R AVDD1 Digital input pins have Schmitt trigger input buffers w March 2006, PD Rev 4.0 4 WM8746 ABSOLUTE MAXIMUM RATINGS Production Data 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