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AD1928 Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD1928 Scheda tecnica(HTML) 1 Page - Analog Devices |
1 / 32 page 2 ADC/8 DAC with PLL, 192 kHz, 24-Bit Codec AD1928 Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2007-2011 Analog Devices, Inc. All rights reserved. FEATURES PLL-generated or direct master clock Low EMI design 108 dB DAC/107 dB ADC dynamic range and SNR −94 dB THD + N 3.3 V single supply Tolerance for 5 V logic inputs Supports 24 bits and 8 kHz to 192 kHz sample rates Differential ADC input Single-ended DAC output Log volume control with autoramp function SPI® controllable for flexibility Software-controllable clickless mute Software power-down Right-justified, left-justified, I2S-justified, and TDM modes Master and slave modes up to 16-channel input/output 48-lead LQFP APPLICATIONS Automotive audio systems Home theater systems Set-top boxes Digital audio effects processors GENERAL DESCRIPTION The AD1928 is a high performance, single-chip codec that provides two analog-to-digital converters (ADCs) with differ- ential input and eight digital-to-analog converters (DACs) with single-ended output using the Analog Devices, Inc., patented multibit sigma-delta (Σ-Δ) architecture. An SPI port is included, allowing a microcontroller to adjust volume and many other parameters. The AD1928 operates from 3.3 V digital and analog supplies. The AD1928 is available in a 48-lead (single-ended output) LQFP package. Other members of this family include a differential DAC output version. The AD1928 is designed for low EMI. This consideration is apparent in both the system and circuit design architectures. By using the on-board PLL to derive the master clock from the LR clock or from an external crystal, the AD1928 eliminates the need for a separate high frequency master clock and can be used with a suppressed bit clock. The digital-to-analog and analog-to-digital converters are designed using the latest Analog Devices continuous time architectures to further minimize EMI. By using 3.3 V supplies, power consumption is minimized, further reducing emissions. FUNCTIONAL BLOCK DIAGRAM SERIAL DATA PORT AD1928 ADC ADC DAC DAC DAC DAC DAC DAC DAC DAC SDATA OUT SDATA IN CLOCKS ANALOG AUDIO OUTPUTS DIGITAL FILTER AND VOLUME CONTROL DIGITAL AUDIO INPUT/OUTPUT TIMING MANAGEMENT AND CONTROL (CLOCK AND PLL) CONTROL PORT SPI ANALOG AUDIO INPUTS QUAD DEC FILTER 48kHz/ 96kHz/ 192kHz CONTROL DATA INPUT/OUTPUT PRECISION VOLTAGE REFERENCE Figure 1. |
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