AD1939 Datasheet, PDF (1/32 Pages) Analog Devices – 4 ADC/8 DAC with PLL, 192 kHz, 24-Bit CODEC

4 ADC/8 DAC with PLL,
192 kHz, 24-Bit CODEC
AD1939
FEATURES
PLL generated or direct master clock
Low EMI design
112 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
Differential 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
64-lead LQFP package
APPLICATIONS
Automotive audio systems
Home Theater Systems
Set-top boxes
Digital audio effects processors
GENERAL DESCRIPTION
The AD1939 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 differential 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 AD1939 operates from 3.3 V digital and analog
supplies. The AD1939 is available in a 64-lead (differential
output) LQFP package.
The AD1939 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 AD1939 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 AUDIO
INPUT/OUTPUT
ANALOG
AUDIO
INPUTS
AD1939
SERIAL DATA PORT
ADC
ADC
ADC
ADC
DIGITAL
FILTER
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
ANALOG
AUDIO
OUTPUTS
CONTROL DATA
INPUT/OUTPUT
Figure 1.
Rev. 0
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