GENERAL DESCRIPTION
The AD9271 is designed for low cost, low power, small size, and ease of use. It contains eight channels of a variable gain amplifier (VGA) with low noise preamplifier (LNA); an antialiasing filter (AAF); and a 12-bit, 10 MSPS to 50 MSPS analog-to-digital converter (ADC).

FEATURES
8 channels of LNA, VGA, AAF, and ADC
Low noise preamplifier (LNA)
   Input-referred noise = 1.2 nV/√Hz @ 7.5 MHz typical
   SPI-programmable gain = 14 dB/15.6 dB/18 dB
   Single-ended input; VINmaximum = 400 mV p-p/333 mV p-p/250 mV p-p
   Dual mode, active input impedance match
   Bandwidth (BW) > 70 MHz
   Full-scale (FS) output = 2 V p-p diff
Variable gain amplifier (VGA)
   Gain range = −6 dB to +24 dB
   Linear-in-dB gain control
Antialiasing filter (AAF)
   3rd-order Butterworth cutoff
   Programmable from 8 MHz to 18 MHz
Analog-to-digital converter (ADC)
   12 bits at 10 MSPS to 50 MSPS
   SNR = 70 dB
   SFDR = 80 dB
   Serial LVDS (ANSI-644, IEEE 1596.3 reduced range link)
   Data and frame clock outputs
Includes crosspoint switch to support
   continuous wave (CW) Doppler
Low power, 150 mW/channel at 12 bits/40 MSPS (TGC)
60 mW/channel in CW Doppler
Single 1.8 V supply (3.3 V supply for CW Doppler output bias)
Flexible power-down modes
Overload recovery in <10 ns
Fast recovery from low power standby mode, <2 μs
100-pin TQFP