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AD1849K Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD1849K Scheda tecnica(HTML) 1 Page - Analog Devices |
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1 / 28 page  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. a Serial-Port 16-Bit SoundPort Stereo Codec AD1849K FEATURES Single-Chip Integrated Digital Audio Stereo Codec Multiple Channels of Stereo Input and Output Digital Signal Mixing On-Chip Speaker and Headphone Drive Capability 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 and Mixed +5 V/+3.3 V Supplies Serial Interface Compatible with ADSP-21xx Fixed- Point DS Ps Compatible with CS4215 (See Text) One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 speaker and stereo headphone drive circuits that require no additional external components. 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, from an external clock, or from the serial interface bit clock. The Codec includes a stereo pair of Σ∆ analog-to-digital converters and a stereo pair of Σ∆ digital-to-analog converters. Analog signals can be input at line levels or microphone levels. 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 left and right channel 16-bit outputs from the ADCs are available over a single bidirectional serial interface that also sup- ports 16-bit digital input to the DACs and control information. The AD1849K can accept and generate 8-bit µ-law or A-law companded digital data. The Σ∆ DACs are preceded by a digital interpolation filter. An attenuator provides independent user volume control over each DAC channel. Nyquist images and shaped quantization noise are removed from the DACs’ analog stereo output by on-chip switched-capacitor and continuous-time filters. Two independent stereo pairs of line-level (or one line-level and one headphone) outputs are generated, as well as drive for a monaural (mono) speaker. (Continued on page 8) FUNCTIONAL BLOCK DIAGRAM MUX ANALOG IN CRYSTALS ANALOG SUPPLY DIGITAL SUPPLY POWER DOWN LINE L LINE R MIC L MIC R L R GAIN OSCILLATORS REFERENCE 2.25V MUTE ∑∆ A/D CONVERTER ∑∆ A/D CONVERTER GAIN 2 2 LINE 0 L LINE 1 L HEADPHONE RETURN ANALOG OUT ∑ ∑ MONITOR MIX ATTENUATE ∑ ∑∆ D/A CONVERTER ∑∆ D/A CONVERTER INTERPOL INTERPOL ATTENUATE CHAINING INPUT CHAINING OUTPUT OUT RETURN MONO SPEAKER ATTENUATE ATTENUATE ANALOG FILTER ANALOG FILTER LOOPBACK L R 20 dB LINE 0 R LINE 1 R S E R I A L P O R T L O O P B A C K DATA/CONTROL MODE DATA/CONTROL TRANSMIT 2 RESET DATA/CONTROL RECEIVE PARALLEL I/O BIT CLOCK FRAME SYNC DIGITAL I/O AD1849K µ/A LAW µ/A LAW µ/A LAW µ/A LAW MUTE L R MUTE PRODUCT OVERVIEW The Serial-Port AD1849K SoundPort® Stereo Codec integrates the key audio data conversion and control functions into a single integrated circuit. The AD1849K is intended to provide a com- plete, single-chip audio solution for multimedia applications requiring operation from a single +5 V supply. External signal path circuit requirements are limited to three low tolerance capacitors for line level applications; anti-imaging filters are incorporated on-chip. The AD1849K includes on-chip monaural SoundPort is a registered trademark of Analog Devices, Inc. |
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