GENERAL DESCRIPTION
The AD6636 is a digital downconverter intended for IF sampling or oversampled baseband radios requiring wide bandwidth input signals. The AD6636 has been optimized for the demanding filtering requirements of wideband standards, such as CDMA2000, UMTS, and TD-SCDMA, but is flexible enough to support wider standards such as WiMAX. The AD6636 is designed for radio systems that use either an IF sampling ADC or a baseband sampling ADC.

FEATURES
   4/6 independent wideband processing channels
   Processes 6 wideband carriers (UMTS, CDMA2000)
   4 single-ended or 2 LVDS parallel input ports
      (16 linear bit plus 3-bit exponent) running at 150 MHz
   Supports 300 MSPS input using external interface logic
   Three 16-bit parallel output ports operating up to 200 MHz
   Real or complex input ports
   Quadrature correction and dc correction for complex inputs
   Supports output rate up to 34 MSPS per channel
   RMS/peak power monitoring of input ports
   Programmable attenuator control for external gain ranging
   3 programmable coefficient FIR filters per channel
   2 decimating half-band filters per channel
   6 programmable digital AGC loops with 96 dB range
   Synchronous serial I/O operation (SPI®-, SPORT-compatible)
   Supports 8-bit or 16-bit microport modes
   3.3 V I/O, 1.8 V CMOS core
   User-configurable, built-in, self-test (BIST) capability
   JTAG boundary scan

APPLICATIONS
   Multicarrier, multimode digital receivers
   GSM, EDGE, PHS, UMTS, WCDMA, CDMA2000, TD-SCDMA,
      WiMAX
   Micro and pico cell systems, software radios
   Broadband data applications
   Instrumentation and test equipment
   Wireless local loops
   In-building wireless telephony