LT5500EGN データシートの表示（PDF） - Linear Technology
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LT5500EGN Datasheet PDF : 12 Pages
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LT5500
APPLICATIONS INFORMATION
ENABLE 100pF
GAIN
100pF SELECT
VCC
RF INPUT
APPLICATION DEPENDENT
COMPONENT VALUES
RF INPUT 1.8GHz
L4
4.7nH
L2
12nH
2.5GHz
2.7nH
4.7nH
L3
4.7nH
1.8nH
C4
220pF
C17
10pF
220pF
10pF
L9
5.6nH
2.7nH
C23
1.8pF
1.5pF
280MHz IF OUTPUT
L7
15nH
T1
TC8-1 MINI-CIRCUITS
IF OUTPUT
EN
LT5500
BIAS
GS
L4
LNA_IN
LNA_OUT
GND
LNA_GND
C4
LO–
100pF
100pF
L2
RF OUT
VCC
*
L5
4.7nH
L7
LO+ C17 L3
LO INPUT
VCC
MIX_GND
LO
MIX_IN
L9
RF
IF
IF+
IF–
MIXER RF
INPUT
C23
T1
••
VCC
C2
100pF
*REFER TO FIGURE 6 FOR POWER SUPPLY
PINS BYPASSING RECOMMENDATION
5500 F03
Figure 3. Simplified Test Schematic for 1.8GHz and 2.5GHz Applications
An IF transformer can be used to create a single-ended
output. The additional discrete components necessary to
achieve a 50Ω match are tabulated in Figure 3. Alterna-
tively, the discrete solution shown in Figure 4 can be used
to perform differential to single-ended conversion. For
best LO and RF signal suppression at the IF output, a
transformer should be used. If it is desirable to reduce the
gain of the mixer, a resistor between the IF outputs can be
used.
LO Buffer
The LO inputs can be driven either differentially or single
ended. A single-ended configuration is shown along with
example component values in Figure 3. Optionally, the LO
can be driven differentially as shown in Figure 5.
12
LT5500
IF+
IF– 13
C14
50Ω
IF OUTPUT
VCC
100pF
L10
L11
IF OUTPUT 280MHz
L10, L11 27nH
C12 3.3pF
C14 2.2pF
C12
5500 F04
Figure 4. Alternative Mixer IF Output Matching
TX1
LO– 19 4:1
LT5500
LO+ 18
LO INPUT
L3
5500 F05
LO INPUT 2.22GHz
L3
3.3nH
TX1 TOKO-BF4
Figure 5. Optional Transformer-Based Differential LO Drive
5500f
8
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