AD9203ARURL7 datasheet(20/29 Pages) AD

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AD9203

Rev. B | Page 19 of 28

AD9203 is powered from a 3 V supply rail while the high

performance AD604 is powered from 5 V supply rails. An

AD8138 is used to drive the AD9203. This is implemented due

to the ability of differential drive techniques to cancel common-

mode noise and input anomalies.

ULTRASOUND APPLICATIONS

The AD9203 provides excellent performance in 10-bit

ultrasound applications. This is demonstrated by its high SNR

with analog input frequencies up to and including Nyquist. The

presence of spurs near the base of a fundamental frequency bin

is demonstrated by Figure 37. Note that the spurs near the noise

floor are more than 80 dB below fIN. This is especially valuable

in Doppler ultrasound applications where low frequency shifts

from the fundamental are important.

The 74 mW power consumption gives the 40 MSPS AD9203 an

order of magnitude improvement over older generation

components.

–110

–100

–90

–80

–70

–60

–50

–40

–30

–20

–10

4.5E+6

4.7E+6

4.9E+6

5.1E+6

5.3E+6

5.5E+6

fIN

FUND

SNR = 59.9dB

THD = –75dB

SFDR = 82dB

AD8138

AINP

AINN

AD9203

1.5V

ANALOG

INPUT

AD604

TGC

AMPLIFIER

SINGLE-

ENDED

ANALOG

GAIN

CONTROL

CONDITIONED

TRANSDUCER

SIGNAL

Figure 36. Ultrasound Connection for the AD9203

Figure 36 illustrates the AD604 variable gain amplifier

configured for time gain compensation (TGC). The low power

Figure 37. SFDR Performance Near the Fundamental Signal (8192 Point FFT,

fIN = 5 MHz, FS = 40 MSPS)

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