Datenblatt-Suchmaschine für elektronische Bauteile |
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AD1938YSTZ Datenblatt(PDF) 1 Page - Analog Devices |
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AD1938YSTZ Datenblatt(HTML) 1 Page - Analog Devices |
1 / 32 page 4 ADC/8 DAC with PLL, 192 kHz, 24-Bit CODEC AD1938 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other 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 ©2006 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 Single 3.3 V 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 and TDM modes Master and slave modes up to 16-channel in/out 48-lead LQFP package APPLICATIONS Automotive audio systems Home Theater Systems Set-top boxes Digital audio effects processors GENERAL DESCRIPTION The AD1938 is a high performance, single-chip codec that provides four analog-to-digital converters (ADCs) with differential 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 AD1938 operates from 3.3 V digital and analog supplies. The AD1938 is available in a 48-lead (single-ended output) LQFP package. Other members of this family include a differential DAC output and I2C® control port version. The AD1938 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 AD1938 eliminates the need for a separate high frequency master clock and can also be used with a suppressed bit clock. The digital-to-analog and analog-to-digital converters are designed using the latest ADI continuous time architectures to further minimize EMI. By using 3.3 V supplies, power consumption is minimized, further reducing emissions. FUNCTIONAL BLOCK DIAGRAM DIGITAL FILTER SERIAL DATA PORT DIGITAL AUDIO INPUT/OUTPUT PRECISION VOLTAGE REFERENCE TIMING MANAGEMENT AND CONTROL (CLOCK AND PLL) CONTROL PORT SPI/I2C CONTROL DATA INPUT/OUTPUT AD1938 ADC ADC ADC ADC ANALOG AUDIO INPUTS ANALOG AUDIO OUTPUTS DAC DAC DAC DAC DAC DAC DAC DAC DIGITAL FILTER AND VOLUME CONTROL SDATA OUT SDATA IN CLOCKS Figure 1. |
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