8-Channel DAC with PLL,
192 kHz, 24 Bits
AD1934
FEATURES
GENERAL DESCRIPTION
PLL generated or direct master clock
Low EMI design
108 dB DAC dynamic range and SNR
−94 dB THD + N
The AD1934 is a high performance, single-chip that provides
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 AD1934 operates from 3.3 V digital and analog supplies.
The AD1934 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
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 AD1934 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 AD1934 eliminates the
need for a separate high frequency master clock and can also be
used with a suppressed bit clock. The digital-to-analog
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
Automotive audio systems
Home theater systems
Set-top boxes
Digital audio effects processors
FUNCTIONAL BLOCK DIAGRAM
AD1934
DAC
DAC
DAC
DIGITAL
FILTER
AND
DAC
DAC
DAC
DAC
DAC
ANALOG
AUDIO
OUTPUTS
VOLUME
CONTROL
CLOCKS
SDATAIN
SERIAL
DATA
PORT
TIMING MANAGEMENT
AND CONTROL
(CLOCK AND PLL)
DIGITAL AUDIO
INPUT/OUTPUT
6.144MHz
PRECISION
VOLTAGE
REFERENCE
CONTROL PORT
2
I C/SPI
CONTROL DATA
INPUT/OUTPUT
Figure 1.
Rev. 0
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