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AD9278BBCZ Datasheet(PDF) 22 Page - Analog Devices

Part # AD9278BBCZ
Description  Octal LNA/VGA/AAF/ADC and CW I/Q Demodulator
PDF  45 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD9278BBCZ Datasheet(HTML) 22 Page - Analog Devices

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Data Sheet
AD9278
Rev. A | Page 21 of 44
Each LNA output is dc-coupled to a VGA input. The VGA
consists of an attenuator with a range of −42 dB, followed by an
amplifier with 21 dB/24 dB/27 dB/30 dB of gain. The X-AMP
gain interpolation technique results in low gain error and
uniform bandwidth, and differential signal paths minimize
distortion.
LNA FULL SCALE
(0.450V p-p SINGLE-ENDED)
LNA INPUT-REFERRED
NOISE FLOOR
(5.8µV rms) AT AAF BW = 15MHz
LNA + VGA NOISE = 1.5nV/ Hz
ADC FULL SCALE (2V p-p)
~10dB MARGIN
>11dB MARGIN
ADC NOISE FLOOR
(224µV rms)
MINIMUM GAIN
MAXIMUM GAIN
LNA
ADC
70dB
VGA GAIN RANGE > 45dB
MAX CHANNEL GAIN > 48dB
88dB
Figure 39. Gain Requirements of TGC Operation for a 12-Bit, 40 MSPS ADC



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