參數(shù)資料
型號： AD9273BSVZ-40
廠商： Analog Devices Inc
文件頁數(shù)： 14/48頁
文件大?。?/td> 0K
描述： IC ADC OCT 12BIT 40MSPS 100-TQFP
標(biāo)準(zhǔn)包裝： 1
類型： AAF，ADC，交叉點(diǎn)開關(guān)，LNA，VGA
分辨率（位）： 12 b
采樣率（每秒）： 40M
數(shù)據(jù)接口： 串行，SPI?
電壓電源： 模擬和數(shù)字
電源電壓： 1.8V，3V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 100-TQFP 裸露焊盤
供應(yīng)商設(shè)備封裝： 100-TQFP-EP（14x14）
包裝： 托盤
AD9273
Rev. B | Page 21 of 48
THEORY OF OPERATION
ULTRASOUND
The primary application for the AD9273 is medical ultrasound.
Figure 37 shows a simplified block diagram of an ultrasound
system. A critical function of an ultrasound system is the time
gain control (TGC) compensation for physiological signal
attenuation. Because the attenuation of ultrasound signals is
exponential with respect to distance (time), a linear-in-dB VGA
is the optimal solution.
Key requirements in an ultrasound signal chain are very low noise,
active input termination, fast overload recovery, low power, and
differential drive to an ADC. Because ultrasound machines use
beam-forming techniques requiring a large binary-weighted
number of channels (for example, 32 to 512 channels), using the
lowest power at the lowest possible noise is of chief importance.
Most modern machines use digital beam forming. In this
technique, the signal is converted to digital format immediately
following the TGC amplifier, and then beam forming is
accomplished digitally.
The ADC resolution of 12 bits with up to 50 MSPS sampling
satisfies the requirements of both general-purpose and high-
end systems.
Power conservation and low cost are two of the most important
factors in low-end and portable ultrasound machines, and the
AD9273 is designed to meet these criteria.
For additional information regarding ultrasound systems, refer
to “How Ultrasound System Considerations Influence Front-End
Component Choice,” Analog Dialogue, Volume 36, Number 3,
May–July 2002, and “The AD9271—A Revolutionary Solution
for Portable Ultrasound,” Analog Dialogue, Volume 41, Number 3,
July 2007.
BEAM-FORMER
CENTRAL CONTROL
Rx BEAM FORMER
(B AND F MODES)
COLOR
DOPPLER (PW)
PROCESSING
(F MODE)
IMAGE AND
MOTION
PROCESSING
(B MODE)
SPECTRAL
DOPPLER
PROCESSING
MODE
DISPLAY
AUDIO
OUTPUT
Tx BEAM FORMER
CW (ANALOG)
BEAM FORMER
TRANSDUCER
ARRAY
128, 256, ETC.,
ELEMENTS
BIDIRECTIONAL
CABLE
HV
MUX/
DEMUX
T/R
SWITCHES
Tx HV AMPs
MULTICHANNELS
AD9273
AAF
VGA
LNA
ADC
CW
07
03
0-
0
7
Figure 37. Simplified Ultrasound System Block Diagram
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