4 ADC with PLL, 192 kHz, 24-Bit ADC Data Sheet AD1974 FEATURES GENERAL DESCRIPTION Phase-locked loop generated or direct master clock The AD1974 is a high performance, single-chip ADC that pro- Low EMI design vides four analog-to-digital converters (ADCs) with differential 107 dB dynamic range and SNR inputs using the Analog Devices, Inc. patented multibit sigma- 94 dB THD + N delta (-) architecture. An SPI port is included, allowing a Single 3.3 V supply microcontroller to enable mutes and adjust many other Tolerance for 5 V logic inputs parameters. The AD1974 operates from 3.3 V digital and analog Supports 24 bits and 8 kHz to 192 kHz sample rates supplies. The AD1974 is available in a single-ended output Differential ADC input 48-lead LQFP. SPI-controllable for flexibility The AD1974 is designed for low EMI. This consideration is Software-controllable clickless mute apparent in both the system and circuit design architectures. Software power-down By using the on-board phase-locked loop (PLL) to derive the 2 Right justified, left justified, I S, and TDM modes master clock from the LR clock or from an external crystal, Master and slave modes up to 16-channel input/output the AD1974 eliminates the need for a separate high frequency Available in a 48-lead LQFP master clock and can also be used with a suppressed bit clock. Qualified for automotive applications The ADCs are designed using the latest continuous time archi- tectures from Analog Devices to further minimize EMI. By APPLICATIONS using 3.3 V supplies, power consumption is minimized, further Automotive audio systems reducing emissions. Home Theater Systems Set-top boxes Digital audio effects processors FUNCTIONAL BLOCK DIAGRAM DIGITAL AUDIO INPUT/OUTPUT AD1974 SERIAL DATA PORT SDATA ADC QUAD OUT DEC FILTER ADC ANALOG CLOCKS 48kHz/ AUDIO 96kHz/192kHz INPUTS ADC TIMING MANAGEMENT AND CONTROL ADC (CLOCK AND PLL) CONTROL PORT PRECISION SPI VOLTAGE REFERENCE 12.48MHz CONTROL DATA INPUT/OUTPUT Figure 1. Rev. D Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20072013 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. 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Technical Support www.analog.com 06614-001AD1974 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 11 Applications ....................................................................................... 1 Analog-to-Digital Converters (ADCs) .................................... 11 General Description ......................................................................... 1 Clock Signals ............................................................................... 11 Functional Block Diagram .............................................................. 1 Reset and Power-Down ............................................................. 11 Revision History ............................................................................... 2 Serial Control Port ..................................................................... 12 Specifications ..................................................................................... 3 Power Supply and Voltage Reference ....................................... 12 Test Conditions ............................................................................. 3 Serial Data PortsData Format ............................................... 12 Analog Performance Specifications ........................................... 3 TDM Modes ................................................................................ 13 Crystal Oscillator Specifications................................................. 4 Daisy-Chain Mode ..................................................................... 14 Digital Input/Output Specifications........................................... 4 Control Registers ............................................................................ 18 Power Supply Specifications........................................................ 5 PLL and Clock Control Registers ............................................. 18 Digital Filters ................................................................................. 5 AUXPORT Control Registers ................................................... 19 Timing Specifications .................................................................. 5 ADC Control Registers .............................................................. 20 Absolute Maximum Ratings ............................................................ 7 Additional Modes ....................................................................... 21 Thermal Resistance ...................................................................... 7 Application Circuits ....................................................................... 23 ESD Caution .................................................................................. 7 Outline Dimensions ....................................................................... 24 Pin Configuration and Function Descriptions ............................. 8 Ordering Guide .......................................................................... 24 Typical Performance Characteristics ........................................... 10 Automotive Products ................................................................. 24 REVISION HISTORY 3/13Rev. C to Rev. B 11/09Rev. 0 to Rev. A Change to tCLH Parameter, Table 7 ................................................... 6 Changed Codec to ADC ............................................... Throughout Changes to Serial Control Port Section ........................................ 12 Changes to Features and General Description Sections .............. 1 Changes to Clock Signals Section ................................................ 11 2/11Rev. B to Rev. C Changes to Figure 12 and Figure 13 ............................................ 16 Changes to Features Section............................................................ 1 Changes to Control Registers Section ......................................... 18 Changes to Ordering Guide .......................................................... 24 4/07Revision 0: Initial Version Added Automotive Products Section .......................................... 24 6/10Rev. A to Rev. B Changed 130C to 125C Throughout ........................................... 4 Changed TA to TC Throughout ....................................................... 4 Changes to Endnote 2 in Ordering Guide .................................. 24 Rev. D Page 2 of 24