8-Channel DAC with PLL and

Differential Outputs, 192 kHz, 24 Bits

Data Sheet

AD1933

Rev. E

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FEATURES

PLL generated or direct master clock

Low EMI design

DAC with 110 dB dynamic range and SNR

−96 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 DAC output

Log volume control with autoramp function

SPI® controllable for flexibility

Software-controllable clickless mute

Software power-down

Master and slave modes up to 16-channel input/output

64-lead LQFP

Qualified for automotive applications

APPLICATIONS

Automotive audio systems

Home Theater Systems

Set-top boxes

Digital audio effects processors

GENERAL DESCRIPTION

The AD1933 is a high performance, single chip that provides

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 AD1933 operates from 3.3 V digital and analog supplies.

The AD1933 is available in a 64-lead (differential output) LQFP.

Other members of this family include a single-ended DAC

output version.

The AD1933 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 AD1933 eliminates the

need for a separate high frequency master clock and can also be

used with a suppressed bit clock. The DACs 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

AD1933

6.144MHz

ANALOG

AUDIO

OUTPUTS

DIGITAL AUDIO

INPUT/OUTPUT

CONTROL DATA

INPUT/OUTPUT

DIGITAL

FILTER

AND

VOLUME

CONTROL

SERIAL

DATA

PORT

PRECISION

VOLTAGE

REFERENCE

CLOCKS

SDATAIN

CONTROL PORT

SPI

TIMING MANAGEMENT

AND CONTROL

(CLOCK AND PULL)

DAC

DAC

DAC

DAC

DAC

DAC

DAC

DAC

Figure 1.