AD1928 Datasheet, PDF (1/32 Pages) Analog Devices – 2 ADC/8 DAC with PLL, 192 kHz, 24-Bit Codec

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
2 ADC/8 DAC with PLL,
192 kHz, 24-Bit Codec
AD1928
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 and I²C® control port versions.
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
DIGITAL AUDIO
INPUT/OUTPUT
ANALOG
AUDIO
INPUTS
AD1928
SERIAL DATA PORT
ADC
ADC
QUAD
DEC
FILTER
48kHz/
96kHz/
192kHz
SDATA
OUT
SDATA
IN
CLOCKS
TIMING MANAGEMENT
AND CONTROL
(CLOCK AND PLL)
DIGITAL
FILTER
AND
VOLUME
CONTROL
PRECISION
VOLTAGE
REFERENCE
CONTROL PORT
SPI/I²C
DAC
DAC
DAC
DAC
DAC
DAC
DAC
DAC
CONTROL DATA
INPUT/OUTPUT
Figure 1.
ANALOG
AUDIO
OUTPUTS
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
www.analog.com
Fax: [phone]
©2007 Analog Devices, Inc. All rights reserved.