WM8728 Datasheet | Wolfson Microelectronics plc

DESCRIPTION The WM8728 is a high performance stereo DAC designed for audio applications such as DVD, home theatre systems, and digital TV. The WM8728 supports PCM data input word lengths from 16 to 32-bits and sampling rates up to 192k Hz. Alternatively the WM8728 can operate in DSD patible mode where a 64x bitstream is input for each channel. The WM8728 consists of a serial interface port, digital interpolation filters, multi-bit sigma delta modulators and stereo DAC in a small 20-pin SSOP package. The WM8728 also includes a digitally controllable mute and attenuate function for each channel. The WM8728 supports a variety of connection schemes for audio DAC control. The 2 or 3-wire MPU serial port provides access to a wide range of features including on-chip mute, attenuation and phase reversal. A hardware controllable interface is also available (DSD operation is only possible in hardware mode). The WM8728 is an ideal device to interface to AC-3, DTS, and MPEG audio decoders for surround sound applications, or for use in DVD players supporting DVD-A. BLOCK DIAGRAM Product Preview, Rev 1.2, April 2001 FEATURES - Stereo DAC with 24 bit PCM or single bit DSD operation - Audio Performance - 106d B SNR (‘A’ weighted @ 48k Hz) DAC - -97d B THD - DAC Sampling Frequency: 8k Hz - 192k Hz - 2 or 3-Wire Serial Control Interface or Hardware Control - Programmable Audio Data Interface Modes - I2S, Left, Right Justified, DSP - 16/20/24/32 bit Word Lengths - Independent Digital Volume Control on Each Channel with 127.5d B Range in 0.5d B Steps - 3.0V - 5.5V Supply Operation - 20-pin SSOP Package - Exceeds Dolby Class A Performance Requirements APPLICATIONS - DVD-Audio and DVD ‘Universal’ Players - Home theatre systems - Digital TV - Digital broadcast receivers MODE LATI2S SCKDSD SDIDEM MUTEB CSBIWL ZERO BCKIN LRCIN SERIAL INTERFACE MUTE/ ATTEN MUTE/ ATTEN CONTROL INTERFACE PCM/DSD DIGITAL FILTERS SIGMA DELTA MODULATOR RIGHT DAC SIGMA DELTA...