AD1928(RevB) Ver la hoja de datos (PDF) - Analog Devices
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AD1928 Datasheet PDF : 32 Pages
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2 ADC/8 DAC with PLL,
192 kHz, 24-Bit Codec
AD1928
FEATURES
GENERAL DESCRIPTION
PLL-generated or direct master clock
The AD1928 is a high performance, single-chip codec that
Low EMI design
provides two analog-to-digital converters (ADCs) with differ-
108 dB DAC/107 dB ADC dynamic range and SNR
ential input and eight digital-to-analog converters (DACs) with
−94 dB THD + N
single-ended output using the Analog Devices, Inc., patented
3.3 V single supply
multibit sigma-delta (Σ-Δ) architecture. An SPI port is included,
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
E SPI® controllable for flexibility
Software-controllable clickless mute
Software power-down
Right-justified, left-justified, I2S-justified, and TDM modes
T Master and slave modes up to 16-channel input/output
48-lead LQFP
APPLICATIONS
E Automotive audio systems
Home theater systems
Set-top boxes
L Digital audio effects processors
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
ODIGITAL AUDIO
INPUT/OUTPUT
BS ANALOG
AUDIO
OINPUTS
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
DAC
DAC
DAC
DAC
DAC
DAC
ANALOG
AUDIO
OUTPUTS
DAC
PRECISION
VOLTAGE
REFERENCE
CONTROL PORT
SPI
DAC
CONTROL DATA
INPUT/OUTPUT
Figure 1.
Rev. B
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