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