8-Channel DAC with PLL and

Single-Ended Outputs, 192 kHz, 24 Bits

Data Sheet

AD1934

Rev. D

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FEATURES

PLL generated or direct master clock

Low EMI design

108 dB DAC 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

Single-ended 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 in/out

48-lead LQFP

Qualified for automotive applications

APPLICATIONS

Automotive audio systems

Home theater systems

Set-top boxes

Digital audio effects processors

GENERAL DESCRIPTION

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 version.

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 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

SERIAL

DATA

PORT

PRECISION

VOLTAGE

REFERENCE

TIMING MANAGEMENT

AND CONTROL

(CLOCK AND PLL)

CONTROL PORT

SPI

CONTROL DATA

INPUT/OUTPUT

AD1934

DIGITAL AUDIO

INPUT/OUTPUT

SDATAIN

CLOCKS

ANALOG

AUDIO

OUTPUTS

6.144MHz

DAC

DAC

DAC

DAC

DAC

DAC

DAC

DAC

DIGITAL

FILTER

AND

VOLUME

CONTROL

Figure 1.