GENERAL DESCRIPTION
The AD9276 is designed for low cost, low power, small size, and ease of use. It contains eight channels of a variable gain amplifier (VGA) with a low noise preamplifier (LNA); an antialiasing filter (AAF); a 12-bit, 10 MSPS to 80 MSPS analog-to-digital converter (ADC); and an I/Q demodulator with programmable phase rotation.
FEATURES
8 channels of LNA, VGA, AAF, ADC, and I/Q demodulator
Low noise preamplifier (LNA)
Input-referred noise: 0.75 nV/√Hz typical at 5 MHz (gain = 21.3 dB)
SPI-programmable gain: 15.6 dB/17.9 dB/21.3 dB
Single-ended input: VIN maximum = 733 mV p-p/550 mV p-p/367 mV p-p
Dual-mode active input impedance matching
Bandwidth (BW) > 100 MHz
Full-scale (FS) output: 4.4 V p-p differential
Variable gain amplifier (VGA)
Attenuator range: −42 dB to 0 dB
Postamp gain: 21 dB/24 dB/27 dB/30 dB
Linear-in-dB gain control
Antialiasing filter (AAF)
Programmable second-order LPF from 8 MHz to 18 MHz
Programmable HPF
Analog-to-digital converter (ADC)
12 bits at 10 MSPS to 80 MSPS
SNR: 70 dB
SFDR: 75 dB
Serial LVDS (ANSI-644, IEEE 1596.3 reduced range link)
Data and frame clock outputs
CW mode I/Q demodulator
Individual programmable phase rotation
Output dynamic range per channel >160 dBFS/√Hz
Low power: 195 mW per channel at 12 bits/40 MSPS (TGC), 94 mW per channel for CW Doppler
Flexible power-down modes
Overload recovery in <10 ns
Fast recovery from low power standby mode: <2 μs
100-lead TQFP_EP
APPLICATIONS
Medical imaging/ultrasound
Automotive radar