WM8740 24-bit High Performance 192 kHz Stereo DAC DESCRIPTION FEATURES 120dB SNR (A weighted mono 48kHz), THD+N: -104dB The WM8740 is a very high performance stereo DAC FS designed for audio applications such as CD, DVD, home 117dB SNR (A weighted stereo 48kHz), THD+N: -104dB theatre systems, set top boxes and digital TV. The WM8740 FS supports data input word lengths from 16 to 24-bits and Sampling frequency: 8kHz to 192kHz sampling rates up to 192kHz. The WM8740 consists of a Selectable digital filter roll-off serial interface port, digital interpolation filter, multi-bit sigma Optional interface to industry standard external filters delta modulator and stereo DAC in a small 28-pin SSOP Differential mono mode needing no glue logic package. The WM8740 also includes a digitally controllable Input data word: 16 to 24-bit mute and attenuator function on each channel. Hardware or SPI compatible serial port control modes: The internal digital filter has two selectable roll-off Hardware mode: mute, de-emphasis, audio format characteristics. A sharp or slow roll-off can be selected control dependent on application requirements. Additionally, the Serial mode: mute, de-emphasis, attenuation (256 internal digital filter can be by-passed and the WM8740 steps), phase reversal used with an external digital filter. Fully differential voltage outputs The WM8740 supports two connection schemes for audio APPLICATIONS DAC control. The SPI-compatible serial control port provides access to a wide range of features including on-chip mute, CD, DVD audio attenuation and phase reversal. A hardware controllable Home theatre systems interface is also available. Professional audio systems BLOCK DIAGRAM WM8740 CONTROL INTERFACE VMIDR SIGMA LOW VOUTRP RIGHT SCLK MUX DELTA PASS MUTE/ DAC MODULATOR FILTER ATTEN VOUTRN BCKIN SERIAL DIGITAL LRCIN INTERFACE FILTERS SIGMA LOW VOUTLP LEFT MUX DELTA PASS DAC MODULATOR FILTER VOUTLN DIN MUTE/ ATTEN VMIDL Rev 4.5 Copyright Cirrus Logic, Inc., 2002 2020 JAN 2020 WM8740 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 INTERNAL POWER ON RESET CIRCUIT ..................................................................... 9 DEVICE DESCRIPTION ............................................................................................... 11 SYSTEM CLOCK ..................................................................................................................... 11 AUDIO DATA INTERFACE ...................................................................................................... 12 NORMAL SAMPLE RATE ........................................................................................................ 12 8 X FS INPUT SAMPLE RATE ................................................................................................. 13 MODES OF OPERATION ........................................................................................................ 14 HARDWARE CONTROL MODES ............................................................................................ 14 SOFTWARE CONTROL INTERFACE ..................................................................................... 14 REGISTER MAP ...................................................................................................................... 15 MUTE MODES ......................................................................................................................... 19 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 IMPORTANT NOTICE .................................................................................................. 27 REVISION HISTORY .................................................................................................... 28 2 Rev 4.5