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.

FEATURES
    Low Cost, High Performance Stereo DACs
    128 Times Oversampling Interpolation Filter
    Multibit SD Modulator with Triangular PDF Dither
    Discrete Time and Continuous Time Analog Reconstruction Filters
    Extremely Low Out-of-Band Energy
    Buffered Outputs with 2 kV Output Load Drive
    94 dB Dynamic Range, –90 dB THD+N Performance
    Digital De-emphasis and Mute
    60.18C 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