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AD1845JP データシート(PDF) 1 Page - Analog Devices |
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AD1845JP データシート(HTML) 1 Page - Analog Devices |
1 / 40 page a Parallel-Port 16-Bit SoundPort® Stereo Codec AD1845 FEATURES Single-Chip Integrated ∑∆ Digital Audio Stereo Codec Microsoft® and Windows® Sound System Compatible MPC Level-2+ Compliant Mixing 16 mA Bus Drive Capability Supports Two DMA Channels for Full Duplex Operation On-Chip Capture and Playback FIFOs Advanced Power-Down Modes Programmable Gain and Attenuation Sample Rates from 4.0 kHz to 50 kHz Derived from a Single Clock or Crystal Input 68-Lead PLCC, 100-Lead TQFP Packages Operation from +5 V Supplies Byte-Wide Parallel Interface to ISA and EISA Buses Pin Compatible with AD1848, AD1846, CS4248, CS4231 REV. C 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. PRODUCT OVERVIEW The Parallel Port AD1845 SoundPort Stereo Codec integrates key audio data conversion and control functions into a single integrated circuit. The AD1845 provides a complete, single chip computer audio solution for business audio and multimedia applications. The codec includes stereo audio converters, com- One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1997 (Continued on Page 9) SoundPort is a registered trademark of Analog Devices, Inc. Microsoft and Windows are registered trademarks of Microsoft Corporation. plete on-chip filtering, MPC Level-2 compliant analog mixing, programmable gain, attenuation and mute, a variable sample frequency generator, FIFOs, and supports advanced power- down modes. It provides a direct, byte-wide interface to both ISA (“AT”) and EISA computer buses for simplified implemen- tation on a computer motherboard or add-in card. The AD1845 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 ad- dressing of thirty-seven internal control registers over this asyn- chronous interface. The AD1845 includes dual DMA count registers for full duplex operation enabling the AD1845 to cap- ture data on one DMA channel and play back data on a separate channel. The FIFOs on the AD1845 reduce the risk of losing data when making DMA transfers over the ISA/EISA bus. The FIFOs buffer data transfers and allow for relaxed timing in acknowledging requests for capture and playback data. FUNCTIONAL BLOCK DIAGRAM GAM = GAIN ATTENTUATE MUTE DIGITAL MIX ATTENUATE VARIABLE SAMPLE FREQUENCY GENERATOR MUTE M_IN L_AUX2 R_AUX2 L_MIC R_MIC ANALOG SUPPLY 0 dB/ 20 dB GAM A/D CONVERTER GAIN CONTROL REGISTERS HOST DMA INTERRUPT REFERENCE L_OUT M_OUT R_OUT L_LINE R_LINE L_AUX1 R_AUX1 AD1845 DIGITAL SUPPLY CLOCK SOURCE POWER DOWN RESET DIGITAL ANALOG BUS DRIVER CONTROL GAIN L R L R EXTERNAL CONTROL VREF VREF_F GAM GAM GAM GAM A/D CONVERTER ATTENUATE MUTE D/A CONVERTER ATTENUATE MUTE D/A CONVERTER -LAW A-LAW LINEAR FIFO -LAW A-LAW LINEAR CS RD WR PLAYBACK ACK CAPTURE ACK PLAYBACK REQ CAPTURE REQ ADR1:0 DATA7:0 FIFO P A R A L L E L P O R T M U X |
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同様の説明 - AD1845JP |
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