GENERAL DESCRIPTION
The AD28msp01 is a complete analog front end for high performance DSP-based modems. The device includes all data conversion, filtering, and clock generation circuitry needed to implement an echo-cancelling modem with a single host digital signal processor. Software-programmable sample rates and clocking modes support all established modem standards. The AD28msp01 simplifies overall system design by requiring only +5 volts.

FEATURES
    Complete Analog l/O Port for DSP-Based FAX/MODEM Applications
    Linear-Coded 16-Bit Sigma-Delta ADC
    Linear-Coded 16-Bit Sigma-Delta DAC
    On-Chip Anti-Alias and Anti-lmage Filters
    Digital Resampling/lnterpolation Filter
    7.2 kHz, 8.0 kHz, and 9.6 kHz Sampling Rates
    8/7 Mode for 8.23 kHz, 9.14 kHz, and 10.97 kHz Sampling Rates
    Synchronous and Asynchronous DAC/ADC Modes
    Bit and Baud Clock Generation
    Transmit Digital Phase-Locked Loop for Terminal Synchronization
    Independent Transmit and Receive Phase Adjustment
    Serial Interface to DSP Processors
    +5 V Operation with Power-Down Mode
    28-Pin Plastic DlP/44-Lead PLCC/28-Lead SOIC

APPLICATIONS
    High Performance DSP-Based Modems
        V.32ter, V.32bis, V.32, V.22bis, V.22, V.21,
            Bell 212A, 103
    Fax and Cellular-Compatible Modems
        V.33, V.29, V.27ter, V.27bis, V.27, V.26bis
    Integrated Fax, Modem, and Speech Processing