ISL59421 Datasheet, PDF (8/12 Pages) Intersil Corporation – 865MHz Multiplexing Amplifier

ISL59421
Pin Descriptions
EQUIVALENT
PIN NUMBER PIN NAME CIRCUIT
DESCRIPTION
1
S0
Circuit 2 Channel selection pin LSB (binary logic code)
2
GND
Circuit 4 Ground pin
3
IN0
Circuit 1 Input for channel 0
4
ENABLE
Circuit 2 Device enable (active low); there are internal pull-down resistors, so the device will be active with
no connection; "HI" puts device into power-down mode
5
IN1
Circuit 1 Input for channel 1
6
HIZ
Circuit 2 Output disable (active high); there are internal pull-down resistors, so the device will be active with
no connection; “HI” puts the output in high impedance state
7
V-
Circuit 4 Negative power supply
8
V+
Circuit 4 Positive power supply
9
OUT
Circuit 3 Output
10
IN-
Circuit 1 Inverting input of output amplifier
V+
IN
V-
CIRCUIT 1.
LOGIC PIN
21K
+
33K ^1.2V-
CIRCUIT 2.
V+
GND.
V-
V+
OUT
V-
CIRCUIT 3.
V+
GND
V-
CAPACITIVELY
COUPLED
ESD CLAMP
CIRCUIT 4.
AC Test Circuits
ISL59421
R_G R_F
Av = 1, 2
R_S
V_IN
50Ω
or
C_L
475Ω
50Ω
or
or
75Ω
462.5Ω
75Ω
TEST EQUIPMENT
50Ω
or
75Ω
ISL59421
R_G R_F
Av = 1, 2
R_S
V_IN
50Ω
or
C_L
475Ω
50Ω
or
or
75Ω
462.5Ω
75Ω
TEST EQUIPMENT
50Ω
or
75Ω
FIGURE 24A. TEST CIRCUIT FOR MEASURING WITH A 50Ω OR
75Ω INPUT TERMINATED EQUIPMENT.
FIGURE 24B. TEST CIRCUIT FOR MEASURING WITH A 50Ω OR 75Ω
INPUT TERMINATED EQUIPMENT.
NOTE: Figure 24A illustrates the optimum output load when connecting to input terminated equipment. Figure 24B illustrates back loaded test circuit
for video cable applications.
8
FN7458.1
September 21, 2005