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