GENERAL DESCRIPTION
The AD9874 is a general-purpose IF subsystem that digitizes a low level 10 MHz to 300 MHz IF input with a signal bandwidth ranging from 6.8 kHz to 270 kHz. The signal chain of the AD9874 consists of a low noise amplifier, a mixer, a band-pass sigma-delta analog-to-digital converter, and a decimation filter with programmable decimation factor. An automatic gain control (AGC) circuit gives the AD9874 12 dB of continuous gain adjustment. Auxiliary blocks include both clock and LO synthesizers.

FEATURES
  10 MHz to 300 MHz Input Frequency
  7.2 kHz to 270 kHz Output Signal Bandwidth
  8.1 dB SSB NF
  0 dBm IIP3
  AGC Free Range up to –34 dBm
  12 dB Continuous AGC Range
  16 dB Front End Attenuator
  Baseband I/Q 16-Bit (or 24-Bit) Serial Digital Output
  LO and Sampling Clock Synthesizers
  Programmable Decimation Factor, Output Format, AGC, and Synthesizer Settings
  370 Ω Input Impedance
  2.7 V to 3.6 V Supply Voltage
  Low Current Consumption: 20 mA
  48-Lead LQFP Package (1.4 mm Thick)

APPLICATIONS
  Multimode Narrow-Band Radio Products
     Analog/Digital UHF/VHF FDMA Receivers
     TETRA, APCO25, GSM/EDGE
  Portable and Mobile Radio Products
  Base Station Applications
  SATCOM Terminals