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參數(shù)資料
| 型號： | AD9203ARU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 10-Bit, 40 MSPS, 3 V, 74 mW A/D Converter |
| 中文描述： | 1-CH 10-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28 |
| 封裝： | MO-153AE, TSSOP-28 |
| 文件頁數(shù)： | 16/19頁 |
| 文件大?。?/td> | 216K |
| 代理商： | AD9203ARU |
REV. 0
AD9203
–16–
ULTRASOUND APPLICATIONS
The AD9203 provides excellent performance in 10-bit ultra-
sound 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 35. Note that the spurs near the noise
floor are more than 80 dB below f
IN
. This is especially valuable
in Doppler ultrasound applications where low frequency shifts
from the fundamental are important.
AD8138
+3V
AINP
AINN
AD9203
1.5V
+3V
SINGLE-
ENDED
ANALOG
AD604
TGC
AMPLIFIER
ANALOG
INPUT
GAIN
CONTROL
CONDITIONED
TRANSDUCER
SIGNAL
Figure 34. Ultrasound Connection for the AD9203
Figure 34 illustrates the AD604 variable gain amplifier con-
figured for time gain compensation (TGC). The low power
AD9203 is powered from a 3 V supply rail while the high per-
formance 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.
The 74 mW power consumption gives the 40 MSPS AD9203
an order of magnitude improvement over older generation
components.
F
IN
10
d
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
4.5E+6
4.7E+6
4.9E+6
5.1E+6
5.3E+6
5.5E+6
FUND
SNR = 59.9dB
THD = –75dB
SFDR = 82dB
Figure 35. SFDR Performance Near the Fundamental
Signal (8192 Point FFT, f
IN
= 5 MHz, F
S
= 40 MSPS)
EVALUATION BOARD
The AD9203 evaluation board is shipped wired for 2 V differen-
tial operation. The board should be connected to power and test
equipment as shown in Figure 36. It is easily configured for
single ended and differential operation as well as 1 V and 2 V
spans. Refer to schematic on next page.
DSP
EQUIPMENT
ANTI-
ALIASING
FILTER
SYNTHESIZER
1MHz 1.9V p-p
HP8644
SYNTHESIZER
40MHz 1V p-p
HP8644
DRVDD
J1
ANALOG
INPUT
GND
+3-5d
AVDD
GND
AVEE
J5
EXTERNAL
CLOCK
AD9203
EVALUATION BOARD
OUTPUT
WORD
+
–
+3V
–
+
+3V
+3V
+
–
+3V
+
–
Figure 36. Evaluation Board Connection
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