LMH6521SQ/NOPB National Semiconductor, LMH6521SQ/NOPB Datasheet - Page 18

• Manufacturer Part Number: LMH6521SQ/NOPB
• Manufacturer: National Semiconductor

Specifications of LMH6521SQ/NOPB

• Lead Free Status / Rohs Status: Compliant

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ADC Noise Filter
Table
low show values for some common IF frequencies for
17. The filter shown in
between bandwidth, noise rejection and cost. This filter topol-
ogy is the same as is used on the ADC14V155KDRB High IF
Receiver reference design board. This filter topology works
best with the 12 to 16 bit analog to digital converters shown
in the table.
IF Frequency Bandpass Filter Component Values
FIGURE 17. Sample Bandpass Filter
Figure 17
offers a good compromise
Figure
30120113
be-
18
POWER SUPPLIES
The LMH6521 was designed primarily to be operated on 5V
power supplies. The voltage range for V
When operated on a board with high speed digital signals it
is important to provide isolation between digital signal noise
and the LMH6521 inputs. The SP16160CH1RB reference
board provides an example of good board layout.
Center
Frequency
Bandwidth
R1, R2
L1, L2
C1, C2
C3
L5
R3, R4
IF Frequency Bandpass Filter Component Values
75 MHz 150 MHz 180 MHz 250 MHz
40 MHz 60 MHz
90 Ω
390 nH 370 nH
10 pF
22 pF
220 nH 62 nH
100 Ω
90 Ω
3 pF
19 pF
100 Ω
CC
75 MHz
90 Ω
300 nH
2.7 pF
15 pF
54 nH
100 Ω
is 4.75V to 5.25V.
100 MHz
90 Ω
225 nH
1.9 pF
11 pF
36 nH
100 Ω