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WM8721 bảng dữ liệu(PDF) 1 Page - Wolfson Microelectronics plc |
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WM8721 bảng dữ liệu(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 34 page  WM8721 Internet Audio DAC with Integrated Headphone Driver Product Preview, November 2000, Rev 1.3 WOLFSON MICROELECTRONICS LTD Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK Tel: +44 (0) 131 667 9386 Fax: +44 (0) 131 667 5176 Email: sales@wolfson.co.uk http://www.wolfson.co.uk Product Preview data sheets contain specifications for products in the formative phase of development. These products may be changed or discontinued without notice. 2000 Wolfson Microelectronics Ltd . DESCRIPTION The WM8721 is a low power stereo DAC with an integrated headphone driver. The WM8721 is designed specifically for portable MP3 audio and speech players. The WM8721 is also ideal for MD, CD machines and DAT players. Stereo 24-bit multi-bit sigma delta DACs are used with oversampling digital interpolation filters. Digital audio input word lengths from 16-32 bits and sampling rates from 8KHz to 96KHz are supported. Stereo audio outputs are buffered for driving headphones from a programmable volume control, line level outputs are also provided along with anti-thump mute and power up/down circuitry. The device is controlled via a 2 or 3 wire serial interface. The interface provides access to all features including volume controls, mutes, de-emphasis and extensive power management facilities. The device is available in a small 20- pin SSOP package. A USB mode is provided where all audio rates can be derived from a simple 12MHz MCLK, saving on need for PLL or multiple crystals. FEATURES • Audio Performance − 100dB SNR (‘A’ weighted @ 48kHz) DAC − 1.42 – 3.6V Digital Supply Operation − 2.7 – 3.6V Analogue Supply Operation • DAC Sampling Frequency: 8KHz – 96KHz • 2 or 3-Wire MPU Serial Control Interface • Programmable Audio Data Interface Modes − I 2S, Left, Right Justified or DSP − 16/20/24/32 bit Word Lengths • Stereo Audio Outputs • Output Volume and Mute Controls • Highly Efficient Headphone Driver • Playback Mode Power Consumption < 18mW • 20-Pin SSOP Package APPLICATIONS • Portable MP3 Players • CD and Minidisc Players BLOCK DIAGRAM DIGITAL FILTERS CONTROL INTERFACE DAC DAC VOL/ MUTE VOL/ MUTE H/P DRIVER H/P DRIVER RHPOUT LHPOUT ROUT LOUT +6 to -73dB 1 dB Steps HPVDD HPGND +6 to -73dB 1 dB Steps DACLRC (4) BCLK (2) DACDAT (3) WM8721 (15) (16) (17) (14) (11) (13) (12) (18) (19) (1) (20) (5) (8) (7) (10) (9) (6) CLKIN DIVIDER (Div x1, x2) |
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Mô tả tương tự - WM8721 |
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