Stereo Audio, 24-Bit, a 96 kHz, Multibit - ADC AD1871 FEATURES PRODUCT OVERVIEW 5.0 V Stereo Audio ADC The AD1871 is a stereo audio ADC intended for digital audio with 3.3 V Tolerant Digital Interface applications requiring high performance analog-to-digital Supports 96 kHz Sample Rates conversion. It features two 24-bit conversion channels each Supports 16-/20-/24-Bit Word Lengths with programmable gain amplifier (PGA), multibit sigma-delta Multibit Sigma-Delta Modulators with modulator, and decimation filters. Each channel provides 105 db Perfect Differential Linearity Restoration for of dynamic range, making the AD1871 suitable for applications Reduced Idle Tones and Noise Floor such as digital audio recorders and mixing consoles. 105 dB (Typ) Dynamic Range Each of the AD1871s input channels (left and right) can be Supports 256/512 and 768 f Master Clocks S configured as either differential or single-ended (two inputs Flexible Serial Data Port muxed with internal single-ended-to-differential conversion). 2 Allows Right-Justified, Left-Justified, I S Compatible The input PGA features a gain range of 0 dB to 12 dB in steps and DSP Serial Port Modes of 3 dB. The - modulator features a proprietary multibit Cascadable (up to Four Devices) from a Single DSP architecture that realizes optimum performance over an audio SPORT bandwidth with standard audio sampling rates of 32 kHz up to Device Control via SPI Compatible Serial Port or 96 kHz. The decimation filter response features very low pass- Optional Control Pins band ripple and excellent stop-band attenuation. On-Chip Reference The AD1871s audio data interface supports all common interface 28-Lead SSOP Package 2 formats such as I S, left-justified, right-justified as well as other APPLICATIONS modes that allow for convenient connection to general-purpose Professional Audio digital signal processors (DSPs). The AD1871 also features an Mixing Consoles SPI compatible serial control port that allows for convenient Musical Instruments control of device parameters and functionality such as sample Digital Audio Recorders, Including word-width, PGA settings, interface modes, and so on. CD-R, MD, DVD-R, DAT, HDD The AD1871 operates from a single 5 V power supplywith Home Theater Systems an optional digital interfacing capability of 3.3 V. It is housed in Automotive Audio Systems a 28-lead SSOP package and is characterized for operation Multimedia over the temperature range 40C to +105C. FUNCTIONAL BLOCK DIAGRAM CAPLN CAPLP AVDD DVDD ODVDD CASC LRCLK VINLP MULTIBIT ANALOG BCLK DATA - DECIMATOR INPUT PORT DOUT MODULATOR BUFFER VINLN DIN RESET FILTER CLOCK AD1871 MCLK ENGINE VREF DIVIDER CLATCH/(M/S) VINRP MULTIBIT ANALOG CCLK/(256/512) SPI INPUT - DECIMATOR PORT CIN/(DF1) BUFFER MODULATOR VINRN COUT/(DF0) XCTRL CAPRN CAPRP AGND DGND REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties that Tel: 781/329-4700 www.analog.com may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781/326-8703 Analog Devices, Inc., 2002AD1871 TABLE OF CONTENTS FEATURES . 1 FUNCTIONAL BLOCK DIAGRAM . 1 PRODUCT OVERVIEW . 1 SPECIFICATIONS . 3 TEST CONDITIONS UNLESS OTHERWISE SPECIFIED . 3 ANALOG PERFORMANCE 3 LOW-PASS DIGITAL FILTER CHARACTERISTICS . 4 HIGH-PASS DIGITAL FILTER CHARACTERISTICS 4 MASTER CLOCK (MCLK) AND RESET TIMING . 4 DATA INTERFACE TIMING 5 CONTROL INTERFACE TIMING 8 DIGITAL I/O 8 POWER 8 TEMPERATURE RANGE 8 ABSOLUTE MAXIMUM RATINGS . 9 ORDERING GUIDE 9 PIN CONFIGURATION . 9 PIN FUNCTION DESCRIPTIONS . 10 TERMINOLOGY 12 TYPICAL PERFORMANCE CURVES . 13 Filter Responses . 13 Device Performance Curves 14 FUNCTIONAL DESCRIPTION 16 Clocking Scheme 16 Modulator 16 Digital Decimating Filters 17 High-Pass Filter . 17 ADC Coding 17 Analog Input Section . 17 Serial Data Interface 17 CONTROL/STATUS REGISTERS 20 Control Register I 21 Control Register II . 22 Control Register III . 23 Peak Reading Registers 24 EXTERNAL CONTROL 24 Master/Slave Select . 24 MCLK Mode Select 24 Serial Data Format Select 24 MODULATOR MODE . 24 INTERFACING . 25 Analog Interfacing . 25 LAYOUT CONSIDERATIONS 26 OUTLINE DIMENSIONS . 27 2 REV. 0