AD9251 Analog Devices, AD9251 Datasheet - Page 22

• Manufacturer Part Number: AD9251
• Description: 14-Bit, 20 MSPS/40 MSPS/65 MSPS/80 MSPS, 1.8 V Dual Analog-to-Digital Converter
• Manufacturer: Analog Devices

Specifications of AD9251

• Resolution (bits): 14bit
• # Chan: 2
• Sample Rate: 80MSPS
• Interface: Par
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref) p-p,2 V p-p
• Adc Architecture: Pipelined
• Pkg Type: CSP

AD9251
Single-Ended Input Configuration
A single-ended input can provide adequate performance in
cost-sensitive applications. In this configuration, SFDR and
distortion performance degrade due to the large input common-
mode swing. If the source impedances on each input are matched,
there should be little effect on SNR performance. Figure 43
shows a typical single-ended input configuration.
ANALOG INPUT
ANALOG INPUT
2V p-p
C
D
0.1µF
P
0.1µF
0.1µF
A
R
D
0Ω
0Ω
Figure 45. Differential Input Configuration Using the AD8352
Figure 44. Differential Double Balun Input Configuration
S
R
G
16
1
2
3
4
5
S
AD8352
V
P
CC
8, 13
14
0.1µF
Rev. A | Page 22 of 36
0.1µF
0.1µF
10
11
25Ω
25Ω
0.1µF
0.1µF
0.1µF
200Ω
200Ω
1V p-p
0.1µF
R
R
0.1µF
C
R
R
10µF
C
49.9Ω
Figure 43. Single-Ended Input Configuration
VIN+x
VIN–x
0.1µF
10µF
0.1µF
ADC
VIN+x
VIN–x
AVDD
1kΩ
1kΩ
1kΩ
1kΩ
VCM
AVDD
ADC
VCM
R
R
C
VIN+x
VIN–x
ADC