AD1938WBSTZ-RL Datasheet, PDF (1/32 Pages) Analog Devices – 4 ADC/8 DAC with PLL, 192 kHz, 24-Bit Codec

Data Sheet
4 ADC/8 DAC with PLL,
192 kHz, 24-Bit Codec
AD1938
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 package
Qualified for automotive applications
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 pro-
vides four analog-to-digital converters (ADCs) with 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 diffe-
rential 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 elimi-
nates the need for a separate high frequency master clock and
can also be used with a suppressed bit clock. The DACs and
ADCs 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
AD1938
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
SPI CONTROL PORT
DAC
DAC
DAC
DAC
DAC
DAC
DAC
DAC
ANALOG
AUDIO
OUTPUTS
CONTROL DATA
INPUT/OUTPUT
Figure 1.
Rev. E
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