WM8720EDS

w DESCRIPTION The WM8720 is a high performance stereo DAC designed for audio applications such as CD, DVD, home theatre systems, set top boxes and digital TV. The WM8720 supports data input word lengths from 16 to 24-bits and sampling rates up to 96kHz. The WM8720 consists of a serial interface port, digital interpolation filter, multi-bit sigma delta modulator and stereo DAC in a small 20-pin SSOP package. The WM8720 also includes a digitally controllable mute and attenuator function on each channel. The WM8720 supports a variety of 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. The programmable data input port supports a variety of glueless interfaces to popular DSPs, audio decoders and S/PDIF and AES/EBU receivers. WM8720 24-bit, 96kHz Stereo DAC with Volume Control FEATURES • • • • • Performance: - 102dB SNR (‘A’ weighted @48kHz), - THD: -95dB @ 0dB FS 5V or 3.3V supply operation Sampling frequency: 8kHz to 96kHz Input data word: 16 to 24-bit Hardware or SPI compatible serial port control modes: - Hardware mode: system clock, reset, mute, de-emphasis - Serial control mode: mute, de-emphasis, digital attenuation (256 steps), zero mute, phase reversal, power down APPLICATIONS • • • • CD, DVD audio Home theatre systems Set top boxes Digital TV BLOCK DIAGRAM WOLFSON MICROELECTRONICS plc www.wolfsonmicro.com Production Data, February 2005, Rev 4.0 Copyright 2005 Wolfson Microelectronics plc. WM8720 PIN CONFIGURATION Production Data PWDN SCKI TEST ML/I2S MC/IWL MD/DM RSTB ZERO VOUTR AGND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 DGND DVDD MODE MUTE LRCIN DIN BCKIN CAP VOUTL AVDD ORDERING INFORMATION DEVICE W M8720EDS W M8720EDS/R W M8720SEDS W M8720SEDS/R Note: Reel quantity = 2,000 TEMPERATURE RANGE -25 to +85oC -25 to +85oC -25 to +85oC -25 to +85oC PACKAGE 20-pin SSOP 20-pin SSOP (tape and reel) 20-pin SSOP (Pb free) 20-pin SSOP (Pb free, tape and reel) MOISTURE SENSITIVITY LEVEL MSL1 MSL1 MSL1 MSL1 PEAK SOLDERING TEMPERATURE 240oC 240oC 260oC 260oC w PD Rev 4.0 February 2005 2 WM8720 PIN DESCRIPTION PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Note: Digital input pins have Schmitt trigger input buffers. NAME PWDN SCKI TEST ML/I2S MC/IWL MD/DM RSTB ZERO VOUTR AGND AVDD VOUTL CAP BCKIN DIN LRCIN MUTE MODE DVDD DGND TYPE Digital input Digital input Digital output Digital input Digital input Digital input Digital input Digital output Analogue output Supply Supply Analogue output Analogue output Digital input Digital input Digital input Digital IO Digital input Supply Supply DESCRIPTION Production Data Powerdown control; low is ON, high is POWER OFF. Internal pull-down. System clock input (256 or 384fs). Reserved. Latch enable (software mode) or input format selection (hardware mode). Internal pull-up. Serial control data clock input (software mode) or input word length selection (hardware mode). Internal pull-up. Serial control data input (software mode) or de-emphasis selection (hardware mode). Internal pull-up. Reset input – active low. Internal pull-up. Infinite zero detect – active low. Open drain type output with active pull-down. Right channel DAC output. Analogue ground supply. Analogue positive supply. Left channel DAC output. Analogue internal reference. Audio data bit clock input. Serial audio data input. Sample rate clock input. Mute control pin, input or automute output. Low is not mute, high is mute, Z is automute. Mode select pin. Low is software mode, high is hardware control. Internal pull-down. Digital positive supply. Digital ground supply. w PD Rev 4.0. February 2005 3 WM8720 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