ADL5243-EVALZ AD [Analog Devices], ADL5243-EVALZ Datasheet - Page 23

• Manufacturer Part Number: ADL5243-EVALZ
• Description: 100 MHz to 4000 MHz RF/IF Digitally Controlled VGA
• Manufacturer: AD [Analog Devices]

Data Sheet
ADL5243
The AMP2 input and output of the
matched to 50 Ω with two or three external components and
the microstrip line used as an inductor. Table 8 lists the required
matching components values. All capacitors are Murata
GRM155 series (0402 size), and Inductor L1 is a Coilcraft®
0603CS series (0603 size). For all frequency bands, the
Table 8. Component Values
Frequency
748 MHz
943 MHz
2140 MHz
2630 MHz
Table 9. Component Spacing
Frequency
748 MHz
943 MHz
2140 MHz
2630 MHz
AMPLIFIER 2 MATCHING
C27
0 Ω
0 Ω
2.2 pF
2.7 pF
C26
Open
3.9 pF
Open
1.1 pF
C26: λ1 (mils)
N/A
236
N/A
126
ADL5243
C28
5.1 pF
Open
1.8 pF
Open
can be easily
C8
12 pF
6 pF
10 pF
10 pF
Rev. A | Page 23 of 32
C28: λ2 (mils)
315
N/A
366
N/A
C22
1.3 pF
1.3 pF
1 pF
1.3 pF
placement of Capacitors C22, C26, and C28 is critical. Table 9
lists the recommended component spacing of C22, C26, and
C28 for the various frequencies. The component spacing is
referenced from the center of the component to the edge of the
package. Figure 59 to Figure 62 show the graphical represent-
ation of the matching network.
C23
100 pF
100 pF
10 pF
20 pF
L2
56 nH
56 nH
9.5 nH
9.5 nH
C22: λ3 (mils)
201
394
244
240
R10
18 Ω
18 Ω
0 Ω
0 Ω
ADL5243
R12
3.9 nH
3.3 nH
0 Ω
0 Ω