AD28MSP01

a 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 GENERAL DESCRIPTION ANALOG INPUTS PSTN Signal Port AD28msp01 FUNCTIONAL BLOCK DIAGRAM 16-BIT SIGMA-DELTA ADC DIGITAL DATA AND CONTROL SERIAL PORT VOLTAGE REFERENCE RESAMPLING INTERPOLATION FILTER DIFFERENTIAL ANALOG OUTPUT 16-BIT SIGMA-DELTA DAC CLOCK INPUTS CLOCK OUTPUTS CLOCK GENERATION 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...