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Analog Devices Semiconductor Electronic Components Datasheet



AD1974

ADC


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AD1974 pdf
4 ADC with PLL,
192 kHz, 24-Bit Codec
AD1974
FEATURES
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
Supports 24 bits and 8 kHz to 192 kHz sample rates
Differential ADC input
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 input/output
Available in a 48-lead LQFP
APPLICATIONS
Automotive audio systems
Home Theater Systems
Set-top boxes
www.DataSheet4U.com Digital audio effects processors
GENERAL DESCRIPTION
The AD1974 is a high performance, single-chip codec 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 adjust volume and 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 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.
FUNCTIONAL BLOCK DIAGRAM
DIGITAL AUDIO
INPUT/OUTPUT
ANALOG
AUDIO
INPUTS
AD1974
SERIAL DATA PORT
ADC
ADC
ADC
ADC
QUAD
DEC
FILTER
48kHz/
96kHz/192kHz
SDATA
OUT
CLOCKS
TIMING MANAGEMENT
AND CONTROL
(CLOCK AND PLL)
PRECISION
VOLTAGE
REFERENCE
CONTROL PORT
SPI
12.48MHz
Figure 1.
CONTROL DATA
INPUT/OUTPUT
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2007 Analog Devices, Inc. All rights reserved.



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AD1974 pdf
AD1974
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Test Conditions............................................................................. 3
Analog Performance Specifications ........................................... 3
Crystal Oscillator Specifications................................................. 4
Digital Input/Output Specifications........................................... 4
Power Supply Specifications........................................................ 5
Digital Filters................................................................................. 5
Timing Specifications .................................................................. 5
Absolute Maximum Ratings............................................................ 7
Thermal Resistance ...................................................................... 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
Typical Performance Characteristics ........................................... 10
REVISION HISTORY
4/07—Revision 0: Initial Version
Theory of Operation ...................................................................... 11
Analog-to-Digital Converters (ADCs).................................... 11
Clock Signals............................................................................... 11
Reset and Power-Down ............................................................. 11
Serial Control Port ..................................................................... 12
Power Supply and Voltage Reference....................................... 12
Serial Data Ports—Data Format............................................... 12
TDM Modes................................................................................ 13
Daisy-Chain Mode ..................................................................... 15
Control Registers ............................................................................ 18
PLL and Clock Control Registers............................................. 18
AUXPORT Control Registers ................................................... 19
ADC Control Registers.............................................................. 20
Additional Modes....................................................................... 22
Application Circuits ....................................................................... 23
Outline Dimensions ....................................................................... 24
Ordering Guide............................................................................... 24
Rev. 0 | Page 2 of 24



Part Number AD1974
Description ADC
Maker Analog Devices - Analog Devices
Total Page 24 Pages
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