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TRF1121
TRF1221
SLWS170B – APRIL 2005 – REVISED JANUARY 2008
www.ti.com
APPLICATION INFORMATION
A typical application schematic is shown in Figure 23 .
The recommended PCB layout mask is shown in Figure 24 . PCB material recommendations are shown in
Table 1 and Figure 22 .
Table 1. PCB Recommendations
Board material
Board material core thickness
Copper thickness (starting)
Prepreg thickness
Recommended number of layers
Via plating thickness
Final plate
Final board thickness
FR4
10 mil (0.254 mm)
1 oz (0.035 mm)
8 mil (0.203 mm)
4
0.5 oz (0.018 mm)
White immersion tin
33 mil–37 mil (0.838 mm–0.94
mm)
Dia. 15 Mil
(0,381 mm)
1 oz. (0,035 mm) Copper + ? oz. (0,018 mm)
Copper Plated Upper and Lower Surfaces
Layer 1
10 Mil (0,254 mm)
Core FR4
35 Mil
(0,889 mm)
8 Mil
(0,203 mm)
Prepreg
DuPont CB 100
Layer 2: 1 oz. (0,035 mm) Copper
Layer 3: 1 oz. (0,035 mm) Copper
10 Mil (0,254 mm)
Core FR4
Layer 4
Conductive ViaPlug
? oz. (0,018 mm) Copper Plated
M0020-03
NOTE: Top and bottom surface finish: copper flash with 50- μ inch to 70- μ inch (1.27- μ m to 1.78- μ m) white immersion tin
Figure 22. PCB Construction and Via Cross Section
22
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Product Folder Link(s): TRF1121 TRF1221
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