AD7985 datasheet(22/28 Pages) AD

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ADA4896-2/ADA4897-1/ADA4897-2

Data Sheet

Rev.

| Page 22 of 28

MEDICAL ULTRASOUND APPLICATIONS

BEAMFORMER

CENTRAL CONTROL

Rx BEAMFORMER

(B AND F MODES)

COLOR

DOPPLER

PROCESSING

(F MODE)

IMAGE AND

MOTION

PROCESSING

(B MODE)

SPECTRAL

DOPPLER

PROCESSING

MODE

DISPLAY

AUDIO

OUTPUT

Tx BEAMFORMER

TRANSDUCER

ARRAY

MUX/

DEMUX

T/R

SWITCHES

AD9279

AAF

VGA

LNA

ADC

CW (ANALOG)

BEAMFORMER

ADA4896-2/

ADA4897-1/

ADA4897-2

Figure 54. Simplified Ultrasound System Block Diagram

Overview of the Ultrasound System

Medical ultrasound systems are among the most sophisticated

signal processing systems in widespread use today. By transmit-

ting acoustic energy into the body and receiving and processing

the returning reflections, ultrasound systems can generate images

of internal organs and structures, map blood flow and tissue

motion, and provide highly accurate blood velocity information.

Figure 54 shows a simplified block diagram of an ultrasound

system.

The ultrasound system consists of two main operations: the

time gain control (TGC) operation and the continuous wave

(CW) Doppler operation. The AD9279 integrates the essential

components of these two operations into a single IC. It contains

eight channels of a variable gain amplifier (VGA) with a low

noise preamplifier (LNA), an antialiasing filter (AAF), an

analog-to-digital converter (ADC), and an I/Q demodulator

with programmable phase rotation. For detailed information

about how to use the AD9279 in an ultrasound system, see the

AD9279 data sheet.

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