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AD1846 Datasheet(PDF) 1 Page - Analog Devices |
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AD1846 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 28 page  REV. A 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. a Low Cost Parallel-Port 16-Bit SoundPort Stereo Codec AD1846 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 FEATURES Low Cost, Pin- and Register-Compatible Alternative to AD1848 Single-Chip Integrated ∑∆ Digital Audio Stereo Codec Supports the Microsoft Windows Sound System* Multiple Channels of Stereo Input and Output Analog and Digital Signal Mixing Programmable Gain and Attenuation On-Chip Signal Filters Digital Interpolation and Decimation Analog Output Low-Pass Sample Rates from 5.5 kHz to 48 kHz 68-Lead PLCC Package Operation from +5 V Supply Byte-Wide Parallel Interface to ISA and EISA Buses Supports One or Two DMA Channels and Programmed I/O It provides a direct, byte-wide interface to both ISA (“AT”) and EISA computer buses for simplified implementation on a com- puter motherboard or add-in card. The AD1846 generates en- able and direction controls for IC buffers such as the 74_245. The AD1846 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 reg- ister 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 filters are incorporated on-chip. DAC 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 con- verters and a stereo pair of ∑∆ digital-to-analog converters. In- puts to the ADC can be selected from four stereo pairs of analog signals: line, microphone (“mic”), auxiliary (“aux”) line #1, and post-mixed DAC output. A software-controlled programmable gain stage allows independent gain for each channel going into the ADC. The ADCs’ output can be digitally mixed with the DACs’ input. (Continued on page 9) PLAYBACK REQ MUX ∑∆ A/D CONVERTER P A R A L L E L P O R T ANALOG CRYSTALS ANALOG SUPPLY DIGITAL SUPPLY L R GAIN L R µ/ A L A W ∑ ∑ OSCILLATORS REFERENCE L_MIC R_MIC R_LINE L_LINE R_AUX1 L_AUX1 ∑ R_OUT GAIN/ATTEN/ MUTE L_AUX2 R_AUX2 ∑ DIGITAL µ/ A L A W DATA7:0 ADR1:0 BUS DRIVER CONTROL 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 INTERPOL INTERPOL ATTENUATE ATTENUATE L_OUT ATTEN/ MUTE ATTEN/ MUTE GAIN/ATTEN/ MUTE AD1846 POWER DOWN V REF PLAYBACK ACK CAPTURE ACK CS WR RD PRODUCT OVERVIEW The Parallel-Port AD1846 SoundPort ® Stereo Codec integrates key audio data conversion and control functions into a single in- tegrated circuit. The AD1846 is intended to provide a complete, single-chip audio solution for business audio and multimedia applications requiring operation from a single +5 V supply. *Windows Sound System is a trademark of Microsoft Corp. SoundPort is a registered trademark of Analog Devices, Inc. FUNCTIONAL BLOCK DIAGRAM |
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