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
