WM8740SEDS/RV

WM8740 w 24-bit, High Performance 192kHz Stereo DAC DESCRIPTION FEATURES The WM8740 is a very high performance stereo DAC designed for audio applications such as CD, DVD, home theatre systems, set top boxes and digital TV. The WM8740 supports data input word lengths from 16 to 24-bits and sampling rates up to 192kHz. The WM8740 consists of a serial interface port, digital interpolation filter, multi-bit sigma delta modulator and stereo DAC in a small 28-pin SSOP package. The WM8740 also includes a digitally controllable mute and attenuator function on each channel. • The internal digital filter has two selectable roll-off characteristics. A sharp or slow roll-off can be selected dependent on application requirements. Additionally, the internal digital filter can be by-passed and the WM8740 used with an external digital filter. The WM8740 supports two connection schemes for audio DAC control. The SPI-compatible serial control port provides access to a wide range of features including onchip mute, attenuation and phase reversal. A hardware controllable interface is also available. • • • • • • • • 120dB SNR (‘A’ weighted mono @48kHz), THD+N: -104dB @ FS 117dB SNR (‘A’ weighted stereo @48kHz), THD+N: -104dB @ FS Sampling frequency: 8kHz to 192kHz Selectable digital filter roll-off Optional interface to industry standard external filters Differential mono mode needing no glue logic Input data word: 16 to 24-bit Hardware or SPI compatible serial port control modes: Hardware mode: mute, de-emphasis, audio format control Serial mode: mute, de-emphasis, attenuation (256 steps), phase reversal Fully differential voltage outputs APPLICATIONS • • • CD, DVD audio Home theatre systems Professional audio systems BLOCK DIAGRAM WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews Production Data, April 2010, Rev 4.4 Copyright ©2010 Wolfson Microelectronics plc WM8740 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 ..................................................... 6 ELECTRICAL CHARACTERISTICS ...................................................................... 6 INTERNAL POWER ON RESET CIRCUIT ............................................................ 9 DEVICE DESCRIPTION ....................................................................................... 12 SYSTEM CLOCK ........................................................................................................ 12 AUDIO DATA INTERFACE ......................................................................................... 12 NORMAL SAMPLE RATE ........................................................................................... 13 8 X FS INPUT SAMPLE RATE .................................................................................... 14 MODES OF OPERATION ........................................................................................... 14 HARDWARE CONTROL MODES ............................................................................... 14 SOFTWARE CONTROL INTERFACE......................................................................... 15 REGISTER MAP ......................................................................................................... 16 MUTE MODES ............................................................................................................ 20 FILTER RESPONSES ................................................................................................. 21 APPLICATIONS INFORMATION ......................................................................... 24 RECOMMENDED EXTERNAL COMPONENTS .......................................................... 24 RECOMMENDED EXTERNAL COMPONENTS VALUES ........................................... 24 SUGGESTED DIFFERENTIAL OUTPUT FILTER CIRCUIT ........................................ 25 RECOMMENDED DUAL DIFFERENTIAL HARDWARE SETUP ................................. 25 PACKAGE DIMENSIONS .................................................................................... 26 ADDRESS: .................................................................................................................. 27 w PD, Rev 4.4, April 2010 2 WM8740 Production Data PIN CONFIGURATION LRCIN 1 28 ML/I2S DIN 2 27 MC/DM1 BCKIN 3 26 MD/DM0 MODE8X 4 25 MUTEB SCLK 5 24 MODE DIFFHW 6 23 CSBIWO DGND 7 22 RSTB DVDD 8 21 ZERO AVDDR 9 20 AVDDL AGNDR 10 19 AGNDL VMIDR 11 18 VMIDL VOUTLP VOUTRP 12 17 VOUTRN 13 16 VOUTLN 15 AVDD AGND 14 ORDERING INFORMATION DEVICE TEMPERATURE RANGE PACKAGE MOISTURE SENSITIVITY LEVEL PEAK SOLDERING TEMPERATURE WM8740SEDS/V -40° to +85°C 28-pin SSOP MSL2 260°C WM8740SEDS/RV -40° to +85°C 28-pin SSOP MSL2 260°C Note: Reel Quantity: 2,000 w PD, Rev 4.4, April 2010 3 WM8740 Production Data PIN DESCRIPTION PIN NAME TYPE 1 LRCIN Digital input Sample rate clock input. 2 DIN Digital input Audio data serial input (except in 8XMODE when it is DINL). 3 BCKIN Digital input Audio data bit clock input . 4 MODE8X Digital input Internal pull-down, active high, 8 x fs mode. 5 SCLK Digital input System clock input. 6 DIFFHW Digital input Internal pull-down, active high, differential mono mode. 7 DGND Supply Digital ground supply. 8 DVDD Supply Digital positive supply. 9 AVDDR Supply Analogue positive supply. 10 AGNDR Supply Analogue ground supply. 11 VMIDR Analogue output Mid rail right channel. 12 VOUTRP Analogue output Right channel DAC output positive. 13 VOUTRN Analogue output Right channel DAC output negative. 14 AGND Supply Analogue ground supply. 15 AVDD Supply Analogue positive supply. 16 VOUTLN Analogue output Left channel DAC output negative. 17 VOUTLP Analogue output Left channel DAC output positive. 18 VMIDL Analogue output Mid rail left channel. 19 AGNDL Supply Analogue ground supply. 20 AVDDL Supply Analogue positive supply. 21 ZERO Digital output Infinite zero detect – active low. Open drain type output with active pull-down. 22 RSTB Digital input Reset input – active low. Internal pull-up. w DESCRIPTION PD, Rev 4.4, April 2010 4 WM8740 PIN NAME Production Data TYPE DESCRIPTION Hardware Mode Normal Mode Wordlength: Low for 16-bit data. High for 20-bit (normal) or 24-bit 2 I S data. Low for hardware mode. Differential Mode Wordlength: Low for 16-bit data. High for 20-bit (normal) or 24-bit 2 I S data. Low for left mono mode. High for right mono mode 23 CSBIWO Digital input Internal pull-down 24 MODE Digital input Internal pull-up 25 MUTEB Digital input Internal pull-up Low to soft mute. High for normal operation. 26 MD/DM0 Digital input Internal pull-up 27 MC/DM1 28 ML/I2S Software Mode Low for serial interface operation. 8X Mode Wordlength: Low for 20-bit data. High for 24-bit data. DINR High for software mode. Low to soft mute. High for normal operation. Low to soft mute. High for normal operation. Low to soft mute. High for normal operation. De-emphasis mode select bit 0. Low for no de-emphasis. High for 44.1kHz de-emphasis. LRP – LRCLK polarity select. Control serial interface data signal. Digital input Internal pull-up De-emphasis mode select bit 1. Low for normal filter operation. High for filter slow roll-off. Unused. Leave unconnected. Control serial interface clock signal. Digital input Internal pull-up Audio serial format: Low – right justified. High – I2S. Audio serial format: Low – right justified. High – I2S. Input data format: Low – right justified. High – left justified. Control serial interface load signal. Note: Digital input pins have Schmitt trigger input buffers. 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