ISL59444 Datasheet, PDF (8/11 Pages) Intersil Corporation – 1GHz, 4 x 1 Multiplexing Amplifier with Synchronous Controls

Pin Descriptions (Continued)
PIN NUMBER
PIN NAME
EQUIVALENT
CIRCUIT
V+
IN
V-
CIRCUIT 1
V+
OUT
V-
CIRCUIT 3
ISL59444
DESCRIPTION
LOGICPIN
21k
+
1.2V
-
33k
CIRCUIT 2
V+
GND.
V-
V+
GND
V-
CAPACITIVELY
COUPLED
ESD CLAMP
CIRCUIT 4
AC Test Circuits
V_IN
50Ω
or
75Ω
ISL59444
C_L
2pF
R_L
500Ω
ISL59444
R_S
V_IN
50Ω
C_L ^475Ω
50Ω
or
2pF
or
75Ω
75Ω
TEST
EQUIPMENT
50Ω
or
75Ω
FIGURE 21A. TEST CIRCUIT WITH OPTIMAL OUTPUT LOAD
FIGURE 21B. TEST CIRCUIT FOR MEASURING WITH A 50Ω OR
75Ω INPUT TERMINATED EQUIPMENT
V_IN
50Ω
or
75Ω
ISL59444
R_S
C_L ^{50Ω or 75Ω}
2pF
TEST
EQUIPMENT
50Ω
or
75Ω
FIGURE 21C. BACKLOADED TEST CIRCUIT FOR VIDEO CABLE APPLICATION. BANDWIDTH AND LINEARITY FOR R_L LESS THAN 500Ω
WILL BE DEGRADED.
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.
8
FN7451.1
September 21, 2005