Datasheet

AD9251
Rev. A | Page 22 of 36
1V p-p
R
R
C
49.9Ω
0.1µF
10µF
10µF
0.1µF
AVDD
1kΩ
1kΩ
1kΩ
1kΩ
ADC
A
V
DD
VIN+x
VIN–x
07938-009
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.
Figure 43. Single-Ended Input Configuration
ADC
R0.1µ
F
0.1µF
2
V p-
p
VCM
C
R
0.1µF
S
0.1µF
25Ω
25Ω
SP
A
P
0
7938-010
VIN+x
VIN–x
Figure 44. Differential Double Balun Input Configuration
AD8352
0Ω
0Ω
C
D
R
D
R
G
0.1µF
0.1µF
0.1µF
0.1µF
16
1
2
3
4
5
11
0.1µF
0.1µF
10
14
0.1µF
8, 13
V
CC
200Ω
200Ω
ANALOG INPUT
ANALOG INPUT
R
R
C
ADC
VCM
07938-011
VIN+x
VIN–x
Figure 45. Differential Input Configuration Using the AD8352