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AD9281-EB Arkusz danych(PDF) 11 Page - Analog Devices

Numer części AD9281-EB
Szczegółowy opis  Dual Channel 8-Bit Resolution CMOS ADC
Download  19 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD9281-EB Arkusz danych(HTML) 11 Page - Analog Devices

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AD9281
–11–
REV. E
QREFT
QREFB
IREFT
0.1 F10 F
0.1 F
0.1 F
AD9281
REFSENSE
AVSS
1V
0.1 F
10 F
IREFB
VREF
0.1 F
0.1 F
10k
10k
ADC
CORE
INTERNAL
CONTROL
LOGIC
0.1 F
1.0 F
Figure 26. Reference Buffer Equivalent Circuit and
External Decoupling Recommendation
For best results in both noise suppression and robustness
against crosstalk, the 4-capacitor buffer decoupling arrangement
shown in Figure 26 is recommended. This decoupling should
–3
–0.5
–13
–23
–33
–43
–53
–63
–73
0
0.5
1
1.5
CML – V
2V
1V
a. Differential Input, 3 V Supplies
–35
–0.5
–40
–45
–50
–55
–60
–65
–70
0
0.5
1
1.5
CML – V
2
2.5
1V
2V
b. Differential Input, 5 V Supplies
Figure 27. THD vs. CML Input Span and Power Supply (Analog Input = 1 MHz)
–15
–0.5
–25
–35
–45
–55
–65
0
0.5
1
1.5
CML – V
2V
1V
c. Single-Ended Input, 3 V Supplies
–15
–0.5
–25
–35
–45
–55
–65
0
0.5
1
1.5
CML – V
2V
1V
2
2.5
d. Single-Ended Input, 5 V Supplies
feature chip capacitors located close to the converter IC. The
capacitors are connected to either IREFT/IREFB or QREFT/
QREFB. A connection to both sides is not required.
COMMON-MODE PERFORMANCE
Attention to the common-mode point of the analog input volt-
age can improve the performance of the AD9281. Figure 27
illustrates THD as a function of common-mode voltage (center
point of the analog input span) and power supply.
Inspection of the curves will yield the following conclusions:
1. An AD9281 running with AVDD = 5 V is the easiest to
drive.
2. Differential inputs are the most insensitive to common-mode
voltage.
3. An AD9281 powered by AVDD = 3 V and a single ended
input, should have a 1 V span with a common-mode voltage
of 0.75 V.


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