4 ADC with PLL,
192 kHz, 24-Bit ADC
AD1974
Data Sheet
FEATURES
GENERAL DESCRIPTION
Phase-locked loop generated or direct master clock
Low EMI design
107 dB dynamic range and SNR
−94 dB THD + N
Single 3.3 V supply
Tolerance for 5 V logic inputs
The AD1974 is a high performance, single-chip ADC that pro-
vides four analog-to-digital converters (ADCs) with differential
inputs using the Analog Devices, Inc. patented multibit sigma-
delta (Σ-Δ) architecture. An SPI port is included, allowing a
microcontroller to enable mutes and adjust many other
parameters. The AD1974 operates from 3.3 V digital and analog
supplies. The AD1974 is available in a single-ended output
48-lead L QF P.
Supports 24 bits and 8 kHz to 192 kHz sample rates
Differential ADC input
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 input/output
Available in a 48-lead LQFP
The AD1974 is designed for low EMI. This consideration is
apparent in both the system and circuit design architectures.
By using the on-board phase-locked loop (PLL) to derive the
master clock from the LR clock or from an external crystal,
the AD1974 eliminates the need for a separate high frequency
master clock and can also be used with a suppressed bit clock.
The ADCs are designed using the latest continuous time archi-
tectures from Analog Devices to further minimize EMI. By
using 3.3 V supplies, power consumption is minimized, further
reducing emissions.
Qualified for automotive applications
APPLICATIONS
Automotive audio systems
Home Theater Systems
Set-top boxes
Digital audio effects processors
FUNCTIONAL BLOCK DIAGRAM
DIGITAL AUDIO
INPUT/OUTPUT
AD1974
SERIAL DATA PORT
SDATA
OUT
ADC
QUAD
DEC
FILTER
ADC
ADC
ADC
ANALOG
AUDIO
INPUTS
CLOCKS
48kHz/
96kHz/192kHz
TIMING MANAGEMENT
AND CONTROL
(CLOCK AND PLL)
CONTROL PORT
SPI
PRECISION
VOLTAGE
REFERENCE
12.48MHz
CONTROL DATA
INPUT/OUTPUT
Figure 1.
Rev. D
Document Feedback
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rightsof third parties that may result fromits use. Specifications subject to change without notice. No
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2007–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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