Features: `8 channels of LNA, VGA, AAF, and ADC`Low noise preamplifier (LNA)`Input-referred noise voltage = 0.75 nV/Hz (gain = 21.3 dB) @ 5 MHz typical`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 impedan...
AD9272: Features: `8 channels of LNA, VGA, AAF, and ADC`Low noise preamplifier (LNA)`Input-referred noise voltage = 0.75 nV/Hz (gain = 21.3 dB) @ 5 MHz typical`SPI-programmable gain = 15.6 dB/17.9 dB/21.3 d...
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Resolution (Bits) | 12bit |
T-Put Rate | 80MSPS |
# Chan | 8 |
Supply V | Multi(+1.8An,+3An,+1.8D) |
Pwr Diss | 1.7W |
Interface | LVDS,Ser |
Ain Range | 367 mV p-p,550 mV p-p,733 mV p-p |
SNR (dB) | 65dB |
Pkg Type | QFP |
The AD9272 is designed for low cost, low power, small size, and ease of use. It contains eight channels of a low noise preamplifier (LNA) with a variable gain amplifier (VGA); an antialiasing filter (AAF); and a 12-bit, 10 MSPS to 80 MSPS analog-to-digital converter (ADC).
Each channel features a variable gain range of 42 dB, a fully differential signal path, an active input preamplifier termination, a maximum gain of up to 52 dB, and an ADC with a conversion rate of up to 80 MSPS. The channel is optimized for dynamic performance and low power in applications where a small package size is critical.
The LNA has a single-ended-to-differential gain that is selectable through the SPI. The LNA input-referred noise voltage is typically 0.75 nV/Hz at a gain of 21.3 dB, and the combined input-referred noise voltage of the entire channel is 0.85 nV/Hz at maximum gain. Assuming a 15 MHz noise bandwidth (NBW) and a 21.3 dB LNA gain, the input SNR is about 92 dB. In CW Doppler mode, the LNA output drives a transconductance amp that is switched through an 8 * 8 differential crosspoint switch. The switch is programmable through the SPI.