LT5525EUF Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
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LT5525EUF Datasheet PDF : 12 Pages
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LT5525
APPLICATIO S I FOR ATIO
Conversion gain and IIP3 performance with an RF fre-
quency of 1900MHz are plotted vs IF frequency in Figure
13. These results show that the usable IF bandwidth for the
lumped element balun is greater than 60MHz, assuming
tight tolerance matching components. Contact the factory
for applications assistance with this circuit.
Table 4. Component Values for Lumped Balun
IF FREQ (MHz) L11, L12 (nH) C11, C12 (pF) C13 (pF)
240
100
3.9
100
360
68
2.7
10
450
56
2.2
8.2
L14 (nH)
560
270
180
0
–5
–10
–15
–20
–25
200 250 300 350 400
FREQUENCY (MHz)
450 500
5525 F12
Figure 12. Typical IF Return Loss
Performance with 240MHz,
360MHz and 450MHz Lumped
Element Baluns
20
IIP3
15
10
5
GAIN
0
TA = 25°C
fLO = fRF – fIF
fRF = 1900MHz
PLO = –5dBm
PRF = –15dBm
–5
200 250 300 350 400 450 500
IF FREQUENCY (MHz)
5525 F13
Figure 13. Typical Gain and IIP3 vs
IF Frequency with 240MHz,
360MHz and 450MHz Lumped
Element Baluns
20
19
18
17
16
15
14
13
12
TA = 25°C
fLO = fRF – fIF
11 PLO = –5dBm
PRF = –15dBm
10
1200 1400 1600 1800 2000
240MHz
360MHz
450MHz
2200 2400 2600
RF FREQUENCY (MHz)
5525 F14
Figure 14. Typical IIP3 vs RF
Frequency with Lumped Element
Baluns and IF Frequencies of
240MHz, 360MHz and 450MHz
TYPICAL APPLICATIO S
Top Layer Silkscreen
Evaluation Board Layouts
Top Layer Metal
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
5525f
11
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