AD9272-65EBZ Analog Devices Inc, AD9272-65EBZ Datasheet - Page 21
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AD9272-65EBZ
Manufacturer Part Number
AD9272-65EBZ
Description
BOARD EVAL AD9272
Manufacturer
Analog Devices Inc
Specifications of AD9272-65EBZ
Design Resources
Powering AD9272 with ADP5020 Switching Regulator PMU for Increased Efficiency (CN0135)
Number Of Adc's
8
Number Of Bits
12
Sampling Rate (per Second)
65M
Data Interface
Serial
Inputs Per Adc
1 Differential
Input Range
733 mVpp
Power (typ) @ Conditions
1.69W @ 65MSPS
Voltage Supply Source
Analog and Digital
Operating Temperature
-40°C ~ 85°C
Utilized Ic / Part
AD9272
Silicon Manufacturer
Analog Devices
Application Sub Type
ADC
Kit Application Type
Data Converter
Silicon Core Number
AD9272
Kit Contents
Board
Development Tool Type
Hardware - Eval/Demo Board
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
THEORY OF OPERATION
ULTRASOUND
The primary application for the AD9272 is medical ultrasound.
Figure 36 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 large binary-
weighted numbers (for example, 32 to 512) of 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
TRANSDUCER
ELEMENTS
128, 256, ...
ARRAY
BIDIRECTIONAL
CABLE
DEMUX
MUX/
HV
Tx HV AMPs
SWITCHES
Figure 36. Simplified Ultrasound System Block Diagram
T/R
Rev. C | Page 21 of 44
LNA
AD9272
BEAM FORMER
CW
CW (ANALOG)
Tx BEAM FORMER
OUTPUT
AUDIO
VGA
following the TGC amplifier, and then beam forming is
accomplished digitally.
The ADC resolution of 12 bits with up to 80 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
AD9272 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 1,
May–July 2002, and “The AD9271—A Revolutionary Solution
for Portable Ultrasound,” Analog Dialogue, Volume 41, Number 3,
July 2007.
AAF
PROCESSING
SPECTRAL
DOPPLER
ADC
MODE
CENTRAL CONTROL
PROCESSING
MULTICHANNELS
IMAGE AND
(B MODE)
BEAM-FORMER
Rx BEAM FORMER
(B AND F MODES)
MOTION
DISPLAY
DOPPLER (PW)
PROCESSING
(F MODE)
COLOR
AD9272