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AD9670BBCZ Arkusz danych(PDF) 1 Page - Analog Devices

Numer części AD9670BBCZ
Szczegółowy opis  Octal Ultrasound AFE with Digital Demodulator
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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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