GENERAL DESCRIPTION
The AD6634 is a multimode 4-channel digital receive signal processor (RSP) capable of processing up to two WCDMA channels. Each channel consists of four cascaded signal processing elements: a frequency translator, two fixed coefficient decimating filters, and a programmable coefficient decimating filter. Each input port has input level threshold detection circuitry and an AGC controller for accommodating large dynamic ranges or situations where gain ranging converters are used. Dual 16-bit parallel output ports accommodate high data rate WBCDMA applications. On-chip interpolating half-band can also be used to further increase the output rate. In addition, each parallel output port has a digital AGC for output data scaling. Link port outputs are provided to enable glueless interfaces to ADI’s TigerSHARC® DSP core.

FEATURES
   80 MSPS Wideband Inputs (14 Linear Bits Plus Three
      RSSI)
   Processes Two WCDMA Channels (UMTS or CDMA2000
      1x) or Four GSM/EDGE, IS136 Channels
   Four Independent Digital Receivers in a Single Package
   Dual 16-Bit Parallel Output Ports
   Dual 8-Bit Link Ports
   Programmable Digital AGC Loops with 96 dB Range
   Digital Resampling for Noninteger Decimation Rates
   Programmable Decimating FIR Filters
   Interpolating Half-Band Filters
   Programmable Attenuator Control for Clip Prevention
      and External Gain Ranging via Level Indicator
   Flexible Control for Multicarrier and Phased Array
   3.3 V I/O, 2.5 V CMOS Core
   User Configurable Built-In Self-Test (BIST) Capability
   JTAG Boundary Scan

APPLICATIONS
   Multicarrier, Multimode Digital Receivers
      GSM, IS136, EDGE, PHS, IS95, UMTS, CDMA2000
   Micro and Pico Cell Systems, Software Radios
   Wireless Local Loop
   Smart Antenna Systems
   In Building Wireless Telephony