AD9201 Analog Devices, AD9201 Datasheet - Page 12

• Manufacturer Part Number: AD9201
• Description: Dual Channel 20 MHz 10-Bit Resolution CMOS ADC
• Manufacturer: Analog Devices

Specifications of AD9201

• Resolution (bits): 10bit
• # Chan: 2
• Sample Rate: 20MSPS
• Interface: Par
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: 1 V p-p,2 V p-p
• Adc Architecture: Pipelined
• Pkg Type: SOP

AD9201
COMMON-MODE PERFORMANCE
Attention to the common-mode point of the analog input volt-
age can improve the performance of the AD9201. Figure 29
illustrates THD as a function of common-mode voltage (center
point of the analog input span) and power supply.
–30
–35
–40
–45
–50
–55
–60
–65
–70
–75
–80
–30
–35
–40
–45
–50
–55
–60
–65
–70
–75
–80
–0.5
–0.5
1V SPAN
a. Differential Input, 3 V Supplies
b. Differential Input, 5 V Supplies
0
0
COMMON-MODE LEVEL – V
COMMON-MODE LEVEL – V
Figure 29. THD vs. CML Input Span and Power Supply (Analog Input = 1 MHz)
0.5
0.5
1.0
1.5
1.0
2V SPAN
2V SPAN
2.0
1V SPAN
2.5
1.5
–12–
Inspection of the curves will yield the following conclusions:
1. An AD9201 running with AVDD = 5 V is the easiest to
2. Differential inputs are the most insensitive to common-mode
3. An AD9201 powered by AVDD = 3 V and a single ended
drive.
voltage.
input, should have a 1 V span with a common-mode voltage
of 0.75 V.
–60
–70
–60
–70
–10
–20
–30
–40
–50
–80
–10
–20
–30
–40
–50
–80
–0.5
–0.5
d. Single-Ended Input, 5 V Supplies
c. Single-Ended Input, 3 V Supplies
0
0
COMMON-MODE LEVEL – V
COMMON-MODE LEVEL – V
0.5
0.5
1.0
1.5
1.0
2V SPAN
2V SPAN
1V SPAN
1V SPAN
2.0
1.5
2.5
REV. D