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AD9670BBCZ Arkusz danych(PDF) 1 Page - Analog Devices |
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AD9670BBCZ Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 53 page Octal Ultrasound AFE with Digital Demodulator Data Sheet AD9670 Rev. A Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother 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 ©2016 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES 8 channels of LNA, VGA, antialiasing filter, ADC, and digital demodulator/decimator Low power 150 mW per channel, time gain compensation (TGC) mode, 40 MSPS 62.5 mW per channel, continuous wave (CW) mode; <30 mW in power-down mode 10 mm × 10 mm, 144-ball CSP_BGA TGC channel, input referred noise voltage: 0.82 nV/√Hz, maximum gain Flexible power-down modes Fast recovery from low power standby mode: <2 μs Low noise preamplifier (LNA) Input noise voltage: 0.78 nV/√Hz, gain = 21.6 dB Programmable gain: 15.6 dB/17.9 dB/21.6 dB 0.1 dB input compression point: 1.00 V p-p/0.75 V p-p/ 0.45 V p-p Flexible active input impedance matching Variable gain amplifier (VGA) Attenuator range: 45 dB, linear-in-dB gain control Postamplifier gain (PGA): 21 dB/24 dB/27 dB/30 dB Antialiasing filter Programmable, second-order low-pass filter from 8 MHz to 18 MHz or 13.5 MHz to 30 MHz and high-pass fil ter Analog-to-digital converter (ADC) Signal-to-noise ratio (SNR): 75 dB, 14 bits up to 125 MSPS Configurable serial low voltage differential signaling (LVDS) CW mode harmonic rejection I/Q demodulator Individual programmable phase rotation Dynamic range per channel: >160 dBFS/√Hz Close in SNR: 156 dBc/√Hz, 1 kHz offset, −3 dBFS Digital demodulator/decimator I/Q demodulator with programmable oscillator FIR decimation filter APPLICATIONS Medical imaging/ultrasound Nondestructive testing (NDT) GENERAL DESCRIPTION The AD9670 is designed for low cost, low power, small size, and ease of use for medical ultrasound applications. It contains eight channels of a VGA with an LNA, a CW harmonic rejection I/Q demodulator with programmable phase rotation, an antialiasing filter, an ADC, and a digital demodulator and decimator for data processing and bandwidth reduction. Each channel features a maximum gain of up to 52 dB, a fully differential signal path, and an active input preamplifier termination. The channel is optimized for high 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 serial port interface (SPI). Assuming a 15 MHz noise bandwidth (NBW) and a 21.6 dB LNA gain, the LNA input SNR is 94 dB. In CW Doppler mode, each LNA output drives an I/Q demodulator that has independently programmable phase rotation with 16 phase settings. Power-down of individual channels is supported to increase battery life for portable applications. Standby mode allows quick power-up for power cycling. In CW Doppler operation, the VGA, antialiasing filter, and ADC are powered down. The ADC contains several features designed to maximize flexibility and minimize system cost, such as a programmable clock, data alignment, and programmable digital test pattern generation. The digital test patterns include built-in fixed patterns, built-in pseudorandom patterns, and custom user-defined test patterns entered via the SPI. |
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