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| W6630CR Application Note STEREO AUDIO DAC 1. GENERAL DESCRIPTION The Winbond W6630 is a stereo audio DAC chip incorporating 8X digital interpolatioin filters, 64X multi-level oversampling delta-sigma modulators, analog low-pass filter and output amplifiers. The operation voltage for this chip can be from 2.7 volt to 5.25 volt. Moreover, the 16 or 18 Bit linear input data for DAC consists of two formats, normal format and I2S format. In addition, the device includes two control modes. One is hardware mode which can control mute and digital de-emphasis. The other one is software mode, where 4x9 bits internal control registers can be controlled by the serial setup port (SSP). Many functions such as 256 step attenuation, DAC mute, digital de-emphasis and format conversions can be setup through these registers. Because the device can reach into the high performance and low-cost design, the main application for this device is used as some consumers system such as the VCD system, CD player system, and MPEG audio system. 2. FEATURES * * * * * * * * * * * * Power Supply from +2.7 to +5.25 Volt, typically +5 Volt, for Analog and Digital Power Sampling Clock Rate: 32 K, 44.1 K, and 48 KHz Master Clock Rate: 384 or 256 times of Sampling Clock Rate Stereo 16 or 18 Bits Linear PCM Data Input Two Types Linear PCM Data Input Format: Normal and I 2S Format Delta-Sigma DAC built-in digital De-emphasis filter, 8X Interpolator, 64X Oversampling Multi-Bit Modulator Stereo DAC Output built-in Analog Low Pass Filter and Ouput Amplifier with 5 K Load High Performance Audio Output: 100 dB SNR, 96 dB Dynamic Range and -90 dB THD+N Two Control Function Modes: Hardware Mode and Software Mode Selected by Mode Pin Software Mode Controlled by 4 x 9 bits Registers via Serial Setup Port (SSP) Main Control Functions: De-emphasis, Mute, 256 Step Attenuation, Channel Output Combination, Input Format Select such 16 or 18 Bit, I2S or Normal Packaged in 20 pin SSOP 3. APPLICATION NOTES This device has two power supply. One is the digital power (DVDD); the other is the analog power (AVDD). The positive value is supplied from 2.7 to 5.25 volt. The application circuit for VCD (Video-CD) is referred to Figure 5-1 as follows. It uses the oscillator as the master clock input. Therefore, the XTALO pin is opened. The audio data input source can be either from MPEG audio decoder or Sound processor. The chip can be selected either hardware mode or software mode by MODE pin. If user selects the software mode, the configuration value may be from the micro-processor via the serial setup port (SSP). In addition, the stereo channel outputs -1- Publication Release Date: December 1998 Revision A1 W6630CR Application Note optionally select an external low-pass filter and power amplifier to achieve the self-design requirement. Because the reset pin has pull-up resistor internally and the value is about 100 K, user only add a capacitor to generate external reset pulse. The value for this capacitor is about 33 F depended on VCD power system, shown in Figure 5-1. In addition, user also can generate a software reset pulse from micro-processor, shown in Figure 5-2. The reset signal is from some I/O port of micro-processor. The most of I/O pins for this chip are TTL compatible except for SSP_EN,SSPCLK, RESET, MODE pins. These values are described in DC spec of data sheet. In addition, the device is buitl-in power on reset circuit internally. If the RESET pin is tied logic-one directly and in order to ensure the power-on circuit work well, user had better add two differnt capacitor value at AVDD and DVDD pin in parallel. The capacitor value of AVDD is bigger than the one of DVDD because the power-on reset circuit is supplied from AVDD pin. For example, the value of DVDD is 0.1 F and the one of AVDD is 10 F depended on the power system from VCD player, shown in Figure 5-3. +2.7--5.25 V 16.9344MHz XTALI 0.1uF DGND DVDD FSLR MPEG AudioDecoder/ Sound Processor(YSS216) DINLR BCLK ZERO VAGR 10 uF VO R AGND 1 2 3 4 20 19 18 17 XTALO CLKO SSP_EN/MUTE SSPCLK/DE1 SSPDIN/DE0 /RESET MODE VAGL VOL AVDD 33 uF +2.7--5.25 V 0.1uF 10 uF MicroProcessor 16 5 W6630CR 15 6 7 8 9 10 14 13 12 11 R_chan Low-Pass Filter & Power Amp. Low-Pass Filter & Power Amp. L_chan Fig. 5-1 Application Circuit for VCD Application -2- W6630CR Application Note +2.7--5.25 V 16.9344 MHz XTALI 0.1uF DGND DVDD FSLR DINLR BCLK ZERO VAGR 10 uF VOR AGND R_chan Low-Pass Filter & Power Amp. Low-Pass Filter & Power Amp. 1 2 3 4 20 19 18 17 XTALO CLKO SSP_EN/MUTE SSPCLK/DE1 SSPDIN/DE0 /RESET MODE VAGL VOL AVDD +2.7--5.25 V 0.1uF 10 uF MicroProcessor MPEG AudioDecoder/ Sound Processor(YSS216) 16 5 W6630CR 15 6 7 8 9 10 14 13 12 11 L_chan Fig. 5-2 Application Circuit for Software Reset from micro-processor +2.7--5.25 V 16.9344MHz XTALI 0.1uF DGND DVDD FSLR DINLR BCLK ZERO VAGR VOR AGND R_chan Low-Pass Filter & Power Amp. Low-Pass Filter & Power Amp. 1 2 3 MPEG AudioDecoder/ Sound Processor(YSS216) 10 uF 4 5 W6630CR 6 15 14 7 13 8 12 9 10 11 20 19 18 17 16 XTALO CLKO SSP_EN/MUTE SSPCLK/DE1 SSPDIN/DE0 /RESET MODE VAGL VOL AVDD +2.7--5.25 V 10uF +2.7--5.25 V 10 uF MicroProcessor L_chan Fig. 5-3 Application Circuit for Power-ON Reset -3- Publication Release Date: December 1998 Revision A1 W6630CR Application Note Headquarters Winbond Electronics (H.K.) Ltd. Rm. 803, World Trade Square, Tower II, No. 4, Creation Rd. III, 123 Hoi Bun Rd., Kwun Tong, Science-Based Industrial Park, Kowloon, Hong Kong Hsinchu, Taiwan TEL: 852-27513100 TEL: 886-3-5770066 FAX: 852-27552064 FAX: 886-3-5792646 http://www.winbond.com.tw/ Voice & Fax-on-demand: 886-2-27197006 Winbond Electronics North America Corp. Winbond Memory Lab. Winbond Microelectronics Corp. Winbond Systems Lab. 2727 N. First Street, San Jose, CA 95134, U.S.A. TEL: 408-9436666 FAX: 408-5441798 Taipei Office 11F, No. 115, Sec. 3, Min-Sheng East Rd., Taipei, Taiwan TEL: 886-2-27190505 FAX: 886-2-27197502 Note: All data and specifications are subject to change without notice. -4- |
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