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AD1843JST Datenblatt(PDF) 1 Page - Analog Devices |
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AD1843JST Datenblatt(HTML) 1 Page - Analog Devices |
1 / 64 page a Serial-Port 16-Bit SoundComm Codec AD1843 FEATURES Single Chip Integrated Speech, Audio, Fax and Modem Codec Highly Configurable Stereo ∑∆ ADCs and Quad ∑∆ DACs Supports V.34, V.32bis, and Fallback Modem Standards As Well As Voice Over Data Dual Digital Resamplers with Programmable Input and Output Phase and Frequency Three On-Chip Phase Lock Loops for Synchronization to External Signals, Including Video Thirteen Analog Inputs and Seven Analog Outputs Advanced Analog and Digital Signal Mixing and Digital- to-Digital Sample Rate Conversion Programmable Gain, Attenuation and Mute On-Chip Signal Filters Digital Interpolation and Decimation Analog Output Low Pass 1 Hz Resolution Programmable Sample Rates from 4 kHz to 54 kHz Derived from a Single Clock Input 80-Lead PQFP and 100-Lead TQFP Packages Operation from +5 V or Mixed +5 V/+3 V Supplies FIFO-Buffered Serial Digital Interface Compatible with ADSP-21xx Fixed-Point DSPs Advanced Power Management VHDL Model of Serial Port Available; Evaluation Board and MAFE Board Available GENERAL PRODUCT DESCRIPTION The AD1843 SoundComm™ Codec is a complete analog front end for high performance DSP-based telephony and audio ap- plications. The device integrates the real-world analog I/O re- quirements for many popular functions thereby reducing size, power consumption, and system complexity. The AD1843 SoundComm is the world’s first codec which can support four different sample rates simultaneously, without any beat fre- quency noise issues. This is essential for highly integrated audio/ modem/fax products since the sample rates associated with au- dio are very much distinct from the sample rates associated with telephony-oriented data communication. It is also the first codec to offer on-chip digital phase lock loops for sample rate synchro- nization to external clock signals. This sample rate flexibility is enabled through Analog Devices’ Continuous Time Oversampling (CTO) technology. The main elements of the AD1843 are its extensive input and mix- ing section, its two channels of sigma-delta ( ∑∆) analog-to-digital conversion, its four channels of ∑∆ digital-to-analog conversion, its digital filters, and the clock and control circuitry for implementing the device’s different modes. The AD1843 permits flexible sample- rate selection through programming and external synchronization, many input and output options, and many mixing options. (continued on page 11) SoundComm is a trademark of Analog Devices, Inc. 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. © 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 SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM 20 dB 4 3 GNDA VCC ∑∆ ADC GAM = GAIN ATTENUATION MUTE GAM GAM FIFO ADC DAC1 DAC2 D I G I T A L I N T E R F A C E 2 CONTROL REGISTERS LEFT AND RIGHT CHANNELS LEFT AND RIGHT CHANNELS GNDD VDD FILTL CMOUT VREF FILTR 4 2 HPOUTR HPOUTC HPOUTL LOUT1 2 MOUT 2 2 2 MIN AUX3 AUX2 AUX1 MIC LIN 3 SYNC XTAL CONV BIT CLKOUT 4 89 LOUT2 AAFILTL AAFILTR 1 SUM RESET PWRDWN 2 PDMNFT MUTE GAM GAM GAM GAM GAM GAM MUTE MUTE MUTE ATTN 2 3 ATTN MUTE S E L E C T O R MUTE SCLK SDFS SDI SDO BM CS TSO TSI XCTL [1:0] µ/A LAW 3 CLOCK GENERATION ATTN M U T E MUTE DRIVER µ/A LAW FIFO µ/A LAW S E L E C T O R S E L E C T O R PGA ∑∆ DAC ∑ ∑ ∑ ∑ ∑ ∑∆ DAC MUTE ∑ ∑ ∑ M U T E ATTN ∑ VOLTAGE REFERENCE AD1843 |
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