2 ADC/8 DAC with PLL,
192 kHz, 24-Bit Codec
ADAU1328
FEATURES
GENERAL DESCRIPTION
PLL generated or direct master clock
Low EMI design
108 dB DAC/107 dB ADC dynamic range and SNR
−94 dB THD + N
The ADAU1328 is a high performance, single-chip codec that
provides two 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 ADAU1328 operates from 3.3 V digital and
analog supplies. The ADAU1328 is available in a 48-lead
(single-ended output) LQFP. Other members of this family
include a differential DAC output and I2C® control port version.
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
The ADAU1328 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 ADAU1328 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.
APPLICATIONS
Home theater systems
Set-top boxes
Digital audio effects processors
FUNCTIONAL BLOCK DIAGRAM
DIGITAL AUDIO
INPUT/OUTPUT
ADAU1328
SERIAL DATA PORT
DAC
DAC
DAC
DAC
DAC
DAC
DAC
DAC
SDATA
OUT
SDATA
IN
DIGITAL
FILTER
AND
VOLUME
CONTROL
ADC
ADC
CLOCKS
DEC
FILTER
48/96/
TIMING MANAGEMENT
AND CONTROL
(CLOCK AND PLL)
192kHz
CONTROL
PORT
SPI/I C
PRECISION
VOLTAGE
REFERENCE
2
12.488MHz
6.144MHz
CONTROL DATA
INPUT/OUTPUT
Figure 1.
Rev. 0
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