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ISL59442 Datasheet, PDF (8/11 Pages) Intersil Corporation – 1GHz, 4 x 1 Multiplexing Amplifier | |||
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AC Test Circuits
VIN
50â¦
or
75â¦
ISL59442
CL
2pF
RL
500â¦
ISL59442
ISL59442
RS
VIN
50â¦
CL 475â¦
50â¦
or
2pF
or
75â¦
75â¦
TEST EQUIPMENT
50â¦
or
75â¦
FIGURE 21A. TEST CIRCUIT WITH OPTIMAL OUTPUT LOAD
FIGURE 21B. TEST CIRCUIT FOR MEASURING WITH A 50⦠OR 75â¦
INPUT TERMINATED EQUIPMENT
VIN
50â¦
or
75â¦
ISL59442
RS
CL 50⦠or 75â¦
2pF
TEST EQUIPMENT
50â¦
or
75â¦
FIGURE 21C. BACKLOADED TEST CIRCUIT FOR VIDEO CABLE APPLICATION. BANDWIDTH AND LINEARITY FOR RL LESS THAN 500⦠WILL BE
DEGRADED
NOTE: Figure 21A illustrates the optimum output load for testing AC performance. Figure 21B illustrates the optimum output load when connecting
to input terminated equipment. Figure 21C illustrates back loaded test circuit for video cable.
Application Circuits
VIN
50â¦
*CL = CT + COUT
-
VOUT
+
CT
1.6pF
COUT
0pF
RL = 500â¦
*CL: TOTAL LOAD CAPACITANCE
CT: TRACE CAPACITANCE
COUT: OUTPUT CAPACITANCE
FIGURE 22A. SMALL SIGNAL 200mVP-P APPLICATION CIRCUIT
VIN
50â¦
RS
-
25â¦
VOUT
+
1.6pF CT
COUT
RL = 500â¦
22pF
CL = CT + COUT
FIGURE 22B. LARGE SIGNAL 1VP-P APPLICATION CIRCUIT
8
FN7452.2
September 21, 2005
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