WM8741 24-bit 192 kHz DAC with Advanced Digital Filtering DESCRIPTION FEATURES Advanced Ultra High Performance Multi-bit Sigma-Delta The WM8741 is a very high performance stereo DAC Architecture designed for audio applications such as professional 128dB SNR (A-weighted mono 48kHz) recording systems, A/V receivers and high specification CD, 125dB SNR (A-weighted stereo 48kHz) DVD and home theatre systems. The device supports PCM 123dB SNR (non-weighted stereo 48kHz) data input word lengths from 16 to 32-bits and sampling -100dB THD 48kHz rates up to 192kHz. The WM8741 also supports DSD bit- Differential analogue voltage outputs stream data format, in both direct DSD and PCM-converted High tolerance to clock jitter DSD modes. PCM Mode The WM8741 includes fine resolution volume and soft mute Sampling frequency: 32kHz to 192kHz control, digital de-emphasis and a range of advanced digital Input data word length support: 16 to 32-bit filter responses, followed by a digital interpolation filter, Supports all standard audio interface formats multi-bit sigma delta modulator and stereo DAC. The Selectable advanced digital filter responses architecture optimises the linearity of the DAC and provides Includes linear/minimum phase and range of maximum insensitivity to clock jitter. tailored characteristics Enables low pre-ringing, minimal latency The digital filters include several selectable roll-off and Optional interface to industry standard external filters performance characteristics. The user can select between Digital volume control in 0.125dB steps with soft ramp standard sharp or slow roll-off responses. In addition, the and soft mute WM8741 includes a selection of advanced digital filter Anti-clipping mode to prevent distortion even with input characteristics including non-half band filters and minimum signals recorded up to 0dB phase filters. Selectable de-emphasis support This flexibility provides a range of benefits, such as Zero Flag output significantly reduced pre-ringing and minimal group delay. DSD Mode The internal digital filters can also be by-passed and the DSD bit-stream support for SACD applications WM8741 used with an external digital filter. Support for normal or phase modulated bit-streams Direct or PCM converted DSD paths (DSD Plus) The WM8741 supports two connection schemes for audio DSD mute DAC control. The 2/3 wire serial control interface provides access to all features. A range of features can also be Hardware or software control modes: accessed by hardware control interface. 2 and 3 wire serial control interface support Pin compatible with WM8740 The WM8741 is available in a convenient 28-SSOP 4.5V to 5.5V analogue, 3.15V to 3.6V digital supply package, and is pin compatible with the WM8740. operation 28-lead SSOP Package APPLICATIONS Professional audio systems CD, DVD, SACD audio Home theatre systems A/V receivers Rev 4.4 Copyright Cirrus Logic, Inc., 2006 2020 JAN 2020 WM8741 BLOCK DIAGRAM CONTROL INTERFACE PCM SIGM A DELTA ATTENUATION / VMIDL MO DULATOR MUT E PCM PCM DIGIT AL FILT ERS BCLK/DSD64CLK PCM SIGM A DELTA FSEL/DINR ATTENUATION / VOUTLP MO DULATOR MUT E DAC DIN/DINL AUDIO LEFT INTERFACE LRCLK/DSDL VOUTLN IW O/DOUT OSR/DSDR DSD DSD TO PCM ATTENUATION / VOUTRP CONVERTOR MUT E DAC RIGHT DSD VOUTRN VMIDR WM8741 2 Rev 4.4 MUT EB/SDO UT MO DE /LRSEL CSB/SADDR/I2S SDIN/DEEMPH SCLK/DSD ZF LAG MCLK DIF FHW PCM /DSD MUX AVDDR AVDDL AGNDR AGNDL AVDD AGND