PRODUCT DESCRIPTION
The AD6600 mixed-signal receiver chip directly samples signals at analog input frequencies up to 250 MHz. The device includes two input channels, each with 1 GHz input amplifiers and 30 dB of automatic gain-ranging circuitry. Both channels are sampled with a 450 MHz track-and-hold followed by an 11-bit, 20 MSPS analog-to-digital converter. Digital RSSI outputs, an A/B channel indicator, a 2× Clock output, references, and con trol circuitry are all on-chip. Digital output signals are two’s complement, CMOS-compatible and interface directly to 3.3 V or 5 V digital processing chips.

FEATURES
   Dual IF Inputs, 70 MHz–250 MHz
      Diversity or Two Independent IF Signals
      Separate Attenuation Paths
   Oversample RF Channels
      20 MSPS on a Single Carrier
      10 MSPS/Channel in Diversity Mode
   Total Signal Range 90+ dB
      30 dB from Automatic Gain-Ranging (AGC)
      60 dB from A/D Converter
      Range >100 dB After Processing Gain
   Digital Outputs
      11-Bit ADC Word
      3-Bit RSSI Word
      2x Clock, A/B Indicator
   Single 5 V Power Supply
      Output DVCC 3.3 V or 5 V
   775 mW Power Dissipation

APPLICATIONS
   Communications Receivers
   PCS/Cellular Base Stations
      GSM, CDMA, TDMA
   Wireless Local Loop, Fixed Access