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AD9271BSVZRL7-50 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD9271BSVZRL7-50 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 58 page Octal LNA/VGA/AAF/ADC and Crosspoint Switch Preliminary Technical Data AD9271 Rev. PrA Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©200 7 Analog Devices, Inc. All rights reserved. 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; VIN maximum = 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 APPLICATIONS Medical imaging/ultrasound Automotive radar 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). Each channel features a variable gain range of 30 dB, a fully differential signal path, an active input preamplifier termination, a maximum gain of up to 40 dB, and an ADC with a conversion rate of up to 50 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 noise is typically 1.2 nV/√Hz, FUNCTIONAL BLOCK DIAGRAM REFERENCE FCO+ FCO– DCO+ DCO– LNA LOSW-H LO-H LI-H LG-H 12-BIT PIPELINE ADC SERIAL LVDS DOUT + H DOUT – H LNA LO-G LOSW-G LI-G LG-G 12-BIT PIPELINE ADC SERIAL LVDS DOUT + G DOUT – G LNA LO-F LOSW-F LI-F LG-F 12-BIT PIPELINE ADC SERIAL LVDS DOUT + F DOUT – F LNA LO-E LOSW-E LI-E LG-E 12-BIT PIPELINE ADC SERIAL LVDS DOUT + E DOUT – E LNA LO-D LOSW-D LI-D LG-D 12-BIT PIPELINE ADC SERIAL LVDS DOUT + D DOUT – D LNA LO-C LOSW-C LI-C LG-C 12-BIT PIPELINE ADC SERIAL LVDS DOUT + C DOUT – C LNA LO-B LOSW-B LI-B LG-B 12-BIT PIPELINE ADC SERIAL LVDS DOUT + B DOUT – B LNA LO-A LOSW-A LI-A LG-A 12-BIT PIPELINE ADC SERIAL LVDS DOUT + A DOUT – A SWITCH ARRAY AAF AAF AAF AAF AAF AAF AAF AAF AD9271 VGA VGA VGA VGA VGA VGA VGA VGA gm 6 Figure 1.Block Diagram and the combined input-referred noise of the entire channel is 1.4 nV/√Hz at maximum gain. Assuming a 15 MHz noise bandwidth (NBW) and a 15.6 dB LNA gain, the input SNR is roughly 86 dB. In CW Doppler mode, the LNA output drives a transconductance amp that is switched through an 8 × 6, differential crosspoint switch. The switch is programmable through the SPI. |
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