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AD1857JRSZ Datasheet(PDF) 1 Page - Analog Devices |
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AD1857JRSZ Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD1857/AD1858 Stereo, Single Supply 16-, 18- and 20-Bit Sigma-Delta DACs FUNCTIONAL BLOCK DIAGRAM One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1997 PRODUCT OVERVIEW The AD1857/AD1858 are complete single-chip stereo digital audio playback components. They each comprise an advanced digital interpolation filter, a revolutionary “linearity-compensated” multibit sigma-delta ( ∑∆) modulator with dither, a jitter-tolerant DAC, switched capacitor and continuous time analog filters and analog output drive circuitry. Other features include digital de-emphasis processing and mute. The AD1857/AD1858 support continuously variable sample rates with essentially linear phase response, and support 50/15 µs digital de-emphasis intended for “Redbook” 44.1 kHz sample frequency playback from Compact Discs. The user must provide a master clock that is synchronous with the left/right clock at 256 or 384 times the intended sample frequency. The AD1857/AD1858 have a simple but very flexible serial data input port that allows for glueless interconnection to a variety of ADCs, DSP chips, AES/EBU receivers and sample rate con- verters. The AD1857 serial data input port can be configured in either 16-bit, 18-bit or 20-bit left-justified or I2S-justified modes. The AD1858 serial data input port can be configured in either 16-bit right-justified or DSP serial port compatible modes. The AD1857/AD1858 accept serial audio data in MSB first, twos-complement format. A power-down mode is offered to minimize power consumption when the device is inactive. The AD1857/AD1858 operate from a single +5 V power supply. They are fabricated on a single monolithic integrated circuit and housed in 20-pin SSOP packages for operation over the temperature range 0 °C to +70°C. FEATURES Low Cost, High Performance Stereo DACs 128 Times Oversampling Interpolation Filter Multibit Modulator with Triangular PDF Dither Discrete Time and Continuous Time Analog Reconstruction Filters Extremely Low Out-of-Band Energy Buffered Outputs with 2 k Output Load Drive 94 dB Dynamic Range, –90 dB THD+N Performance Digital De-emphasis and Mute 0.1 C Maximum Phase Linearity Deviation Continuously Variable Sample Rate Support Power-Down Mode 16-, 18- and 20-Bit I2S-Justified, Left-Justified Modes Offered on AD1857 Accepts 24-Bit Word 16-Bit Right-Justified and DSP Serial Port Modes Offered on AD1858 Single +5 V Supply 20-Pin SSOP Package APPLICATIONS Digital Cable TV and Direct Broadcast Satellite Set-Top Decoder Boxes Video Laser Disk, Video CD and CD-I Players High Definition Televisions, Digital Audio Broadcast Receivers CD, CD-R, DAT, DCC and MD Players Digital Audio Workstations, Computer Multimedia Products MUTE MUTE MULTIBIT Σ∆ MODULATOR AD1857/AD1858 ANALOG SUPPLY DIGITAL SUPPLY 16-/18-/20-BIT DIGITAL DATA INPUT ANALOG OUTPUTS MUTE CLOCK MODE CLOCK IN SERIAL MODE COMMON MODE 2 4 3 DE-EMPHASIS POWER-DOWN/RESET 128x INTERPOLATION FILTER SERIAL DATA INTERFACE MULTIBIT Σ∆ MODULATOR 128x INTERPOLATION FILTER VOLTAGE REFERENCE ANALOG FILTER CLOCK CIRCUIT OUTPUT BUFFER ANALOG FILTER OUTPUT BUFFER DAC DAC |
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