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AD1848 Datasheet(PDF) 1 Page - Analog Devices |
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AD1848 Datasheet(HTML) 1 Page - Analog Devices |
1 / 28 page a Parallel-Port 16-Bit SoundPort Stereo Codec AD1848K FEATURES Single-Chip Integrated ∑∆ Digital Audio Stereo Codec Supports the Microsoft Windows Sound System® Multiple Channels of Stereo Input Analog and Digital Signal Mixing Programmable Gain and Attenuation On-Chip Signal Filters Digital Interpolation Analog Output Low-Pass Sample Rates from 5.5 kHz to 48 kHz 68-Lead PLCC and 68-Lead TQFP Packages Operation from +5 V Supplies Byte-Wide Parallel Interface to ISA and EISA Buses Supports One or Two DMA Channels and Programmed I/O supply. It provides a direct, byte-wide interface to both ISA (“AT”) and EISA computer buses for simplified implementa- tion on a computer motherboard or add-in card. The AD1848K generates enable and direction controls for IC buffers such as 74_245. The AD1848K SoundPort Stereo Codec supports a DMA re- quest/grant architecture for transferring data with the host com- puter bus. One or two DMA channels can be supported. Programmed I/O (PIO) mode is also supported for control register accesses and for applications lacking DMA control. Two input control lines support mixed direct and indirect addressing of twenty-one internal control registers over this asynchronous interface. External circuit requirements are limited to a minimal number of low cost support components. Anti-imaging DAC output fil- ters are incorporated on-chip. Dynamic range exceeds 80 dB over the 20 kHz audio band. Sample rates from 5.5 kHz to 48 kHz are supported from external crystals. The Codec includes a stereo pair of ∑∆ analog-to-digital converters and a stereo pair of ∑∆ digital-to-analog converters. Inputs to the ADC can be selected from four stereo pairs of (Continued on page 9) REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 PRODUCT OVERVIEW The Parallel-Port AD1848K SoundPort® Stereo Codec inte- grates the key audio data conversion and control functions into a single integrated circuit. The AD1848K is intended to provide a complete, single-chip audio solution for business audio and multimedia applications requiring operation from a single +5 V SoundPort is a registered trademark of Analog Devices, Inc. FUNCTIONAL BLOCK DIAGRAM MUX ∑∆ A/D CONVERTER P A R A L L E L P O R T ANALOG CRYSTALS ANALOG SUPPLY DIGITAL SUPPLY POWER DOWN 20 dB L_LINE R_LINE L_MIC R_MIC L R GAIN L R µ/ A L A W ∑ ∑ OSCILLATORS REFERENCE 2.25V L_AUX1 R_AUX1 ∑ R_OUT GAIN/ATTEN/MUTE L_AUX2 R_AUX2 ∑ DIGITAL µ/ A L A W DATA7:0 ADR1:0 CS WR RD BUS DRIVER CONTROL PLAYBACK ACK PLAYBACK REQ CAPTURE ACK CAPTURE REQ HOST DMA INTERRUPT EXTERNAL CONTROL CONTROL REGS DIGITAL MIX 16 ∑∆ A/D CONVERTER 16 ∑∆ D/A CONVERTER ∑∆ D/A CONVERTER ANALOG FILTER GAIN ANALOG FILTER 2 2 2 2 2 8 INTERPOL INTERPOL ATTENUATE ATTENUATE L_OUT ATTEN/ MUTE ATTEN/ MUTE GAIN/ATTEN/MUTE |
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