AD9201 Analog Devices, AD9201 Datasheet - Page 11

• 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

Figure 26. Reference Buffer Equivalent Circuit and Exter-
nal 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
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.
DRIVING THE AD9201
Figure 27 illustrates the use of an AD8051 to drive the AD9201.
Even though the AD8051 is specified with 3 V and 5 V power,
the best results are obtained at 5 V power. The ADC input
span is 2 V.
REV. D
10 F
10 F
0.1 F
0.1 F
0.1 F
REFSENSE
0.1 F
IREFT
AVSS
IREFB
VREF
10k
10k
CORE
ADC
AD9201
INTERNAL
CONTROL
LOGIC
1V
QREFT
QREFB
0.1 F
0.1 F
10 F
0.1 F
–11–
50
–100
–110
–120
–10
–20
–30
–40
–50
–60
–70
–80
–90
0.0E+0
10
0
Figure 28. AD8051/AD9201 Performance
3
2
1.0E+6
2ND
AD8051
2.0E+6
4TH
6
3.0E+6
1k
1k
6TH
24
8TH
4.0E+6
Figure 27.
0.33 F
0.01 F
5.0E+6
1k
6.0E+6
VREF
7TH
7.0E+6
22
22
5TH
8.0E+6
10pF
10pF
3RD
AD9201
9.0E+6
FUND
17
16
10.0E+6
ADC