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| ISL59420_14 Datasheet, PDF (9/13 Pages) Intersil Corporation – 400MHz Multiplexing Amplifier | |||
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AC Test Circuits
ISL59420
RG RF
AV = 1, 2
RS
VIN
50Ω
or
CL
475Ω
or
50Ω
or
75Ω
462.5Ω
75Ω
ISL59420
TEST
EQUIPMENT
50Ω
or
75Ω
ISL59420
RG RF
VIN
50Ω
or
75Ω
AV = 1, 2
RS
CL 50Ω or 75Ω
TEST
EQUIPMENT
50Ω
or
75Ω
FIGURE 25A. TEST CIRCUIT FOR MEASURING WITH A 50Ω OR 75Ω
INPUT TERMINATED EQUIPMENT
FIGURE 25B. BACKLOADED TEST CIRCUIT FOR VIDEO CABLE
APPLICATION. BANDWIDTH AND LINEARITY FOR RL
LESS THAN 500Ω WILL BE DEGRADED.
NOTE: Figure 25A illustrates the optimum output load when connecting to input terminated equipment. Figure 26B illustrates backloaded test circuit for
video cable applications.
Application Circuits
200Ω
VIN
50Ω
-
+
0.6pF
CG
PC BOARD
CAPACITANCE
*CL = CT + COUT
CT
1.6pF
COUT
3.9pF
VOUT
RL = 500Ω
0.4pF < CG < 0.7pF
*CL: TOTAL LOAD CAPACITANCE
CT: TRACE CAPACITANCE
COUT: OUTPUT CAPACITANCE
FIGURE 26A. GAIN OF 1 APPLICATION CIRCUIT
VIN
50Ω
453Ω
453Ω
-
*CL = CT + COUT
+
0.6pF
CG
PC BOARD
CAPACITANCE
CT
1.6pF
COUT
3.9pF
0.4pF < CG < 0.7pF
FIGURE 26B. GAIN OF 2 APPLICATION CIRCUIT
VOUT
RL = 500Ω
9
FN7459.2
July 3, 2012
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