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AD1847JP bảng dữ liệu(PDF) 1 Page - Analog Devices |
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AD1847JP bảng dữ liệu(HTML) 1 Page - Analog Devices |
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1 / 28 page  REV. B 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 Serial-Port 16-Bit SoundPort Stereo Codec AD1847 ® Analog Devices, Inc., 1996 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 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 and Decimation Analog Output Low-Pass Sample Rates from 5.5 kHz to 48 kHz 44-Lead PLCC and TQFP Packages Operation from +5 V Supplies Serial Digital Interface Compatible with ADSP-21xx Fixed-Point DSP I S A B U S ASIC AD1847 DSP Figure 1. Example System Diagram External circuit requirements are limited to a minimal number of low cost support components. Anti-imaging DAC output filters are incorporated on-chip. Dynamic range exceeds 70 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 (ADCs) and a stereo pair of ∑∆ digital-to-analog con- verters (DACs). Inputs to the ADC can be selected from four stereo pairs of analog signals: line 1, line 2, 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. The pair of 16-bit outputs from the ADCs is available over a se- rial interface that also supports 16-bit digital input to the DACs and control/status information. The AD1847 can accept and generate 16-bit twos-complement PCM linear digital data, 8-bit unsigned magnitude PCM linear data, and 8-bit µ-law or A-law companded digital data. (Continued on page 7) FUNCTIONAL BLOCK DIAGRAM ANALOG I/O L R DIGITAL I/O CRYSTALS 2 2 2 S E R I A L P O R T OSCILLATORS 2.25V REFERENCE L R L R CLOCK OUT ATTEN DIGITAL SUPPLY ANALOG SUPPLY M U X L R L R L R L R BUS MASTER TIME SLOT INPUT TIME SLOT OUTPUT SERIAL DATA OUTPUT SERIAL DATA INPUT EXTERNAL CONTROL SERIAL BIT CLOCK FRAME SYNC RESET LINE 1 INPUT LINE 2 INPUT AUX 1 INPUT LINE OUTPUT AUX 2 INPUT AD1847 ∑ ATTEN/ MUTE ATTEN POWER DOWN µ/A LAW µ/A LAW ATTEN ∑ ∑ ∑ ∑∆ D/A CONVERTER ∑∆ D/A CONVERTER µ/A LAW µ/A LAW GAIN GAIN ∑∆ A/D CONVERTER ∑∆ A/D CONVERTER GAIN/ATTEN/MUTE GAIN/ATTEN /MUTE GAIN/ATTEN /MUTE ATTEN/ MUTE PRODUCT OVERVIEW The AD1847 SoundPort ® Stereo Codec integrates key audio data conversion and control functions into a single integrated circuit. The AD1847 is intended to provide a complete, low cost, single-chip solution for business, game audio and multi- media applications requiring operation from a single +5 V sup- ply. It provides a serial interface for implementation on a computer motherboard, add-in or PCMCIA card. See Figure 1 for an example system diagram. *Windows Sound System is a registered trademark of Microsoft Corp. SoundPort is a registered trademark of Analog Devices, Inc. |
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