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AD1938YSTZ Datenblatt(PDF) 1 Page - Analog Devices

Teilenummer AD1938YSTZ
Bauteilbeschribung  4 ADC/8 DAC with PLL, 192 kHz, 24-Bit CODEC
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Direct Link  http://www.analog.com
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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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