Datasheet

LTC6417
20
6417f
Figure 5. DC1685A Simplified Schematic with Suggested Bandpass Filter for Driving an LTC2209 16-Bit ADC at 140MHz
applicaTions inForMaTion
••
100Ω
100Ω
PWRADJ
GND
SHDN
CLHI
V
OR
6417 F05
OUT
+
OUT
–
0.1µF
0.01µF
0.01µF
5V
2.2µF
3.3V
V
CM
2.2µF
8
1,6,
11,16
3,7,10,
17,20,21
5
12
15
14
2
9
19
18
T1
WBC4-14LB
10Ω
10Ω
R42
300Ω
C45
18pF
E3
75nH
R43
300Ω
1k
R53
120Ω
A
IN
+
A
IN
–
PGA = 0
LTC2209
IN
+
V
+
IN
–
LTC6417
680pF
CLOCK
(153.6MHz)
16
4
6
3
2
1
V
CM
C40
12pF
C41
12pF
E5
51nH
C10
12pF
C46
18pF
E3
75nH
R36
60.4Ω
C43
27pF
E1
51nH
R12
60.4Ω
C44
27pF
E2
51nH
50Ω
+
–
0Ω
0Ω
Table 1. Bandpass Filter Component Values for Different Input Frequencies
INPUT FREQUENCIES
COMPONENTS 70MHz 140MHz 270MHz 380MHz
R12 = R36 60.4Ω 60.4Ω 60.4Ω 60.4Ω
C43 = C44 56pF 27pF 15pF 12pF
E1 = E2 100nH 51nH 27nH 18nH
C41 47pF 12pF 12pF 10pF
C10 = C40 13pF 12pF 3.3pF 2.7pF
E5 100nH 51nH 27nH 18nH
R42 = R43 300Ω 300Ω 300Ω 300Ω
R53 120Ω 120Ω 120Ω 120Ω
C45 = C46 39pF 18pF 10pF 8.2pF
E3 = E4 150nH 75nH 39nH 27nH