LT5527 LINER [Linear Technology], LT5527 Datasheet - Page 14

• Manufacturer Part Number: LT5527
• Description: 400MHz to 3.7GHz 5V High Signal Level Downconverting Mixer
• Manufacturer: LINER [Linear Technology]

APPLICATIONS INFORMATION
LT5527
matching inductors in a band-pass IF matching network.
The values of L1, L2 and C3 are calculated to resonate at
the desired IF frequency with a quality factor that satisfi es
the required IF bandwidth. The L and C values are then
adjusted to account for the mixer’s internal 2.5pF capaci-
tance and the SAW fi lter’s input capacitance. In this case,
the differential IF output impedance is 400Ω since the
bandpass network does not transform the impedance.
Additional matching elements may be required if the SAW
fi lter’s input impedance is less than or greater than 400Ω.
Contact the factory for application assistance.
14
Standard Evaluation Board Layout
Figure 14. Bandpass IF Matching for Differential IF Architectures
DECOUPLING
SUPPLY
Discrete IF Evaluation Board Layout
IF
IF
+
–
C3
V
L1
L2
CC
FILTER
SAW
AMP
5527 F14
IF
5527fa