ISL59420 Datasheet, PDF (8/12 Pages) Intersil Corporation – 400MHz Multiplexing Amplifier

ISL59420
Pin Descriptions
PIN NUMBER PIN NAME
1
S0
2
GND
3
IN0
4
ENABLE
5
IN1
6
HIZ
7
V-
8
V+
9
OUT
10
IN-
Equivalent
Circuit
Circuit 2
Circuit 4
Circuit 1
Circuit 2
Circuit 1
Circuit 2
Circuit 4
Circuit 4
Circuit 3
Circuit 1
DESCRIPTION
Channel selection pin LSB (binary logic code)
Ground pin
Input for channel 0
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.
Input for channel 1
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.
Negative power supply
Positive power supply
Output
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.
AC Test Circuits
ISL59420
R_G R_F
Av = 1, 2
V_IN
50Ω
or
75Ω
R_S
C_L
475Ω
or
50Ω
or
462.5Ω
75Ω
TEST
EQUIPMENT
50Ω
or
75Ω
V+
GND
V-
CAPACITIVELY
COUPLED
ESD CLAMP
CIRCUIT 4.
ISL59420
R_G R_F
V_IN
50Ω
or
75Ω
Av = 1, 2
R_S
C_L ^{50Ω or 75Ω}
TEST
EQUIPMENT
50Ω
or
75Ω
FIGURE 24A. TEST CIRCUIT FOR MEASURING WITH A 50Ω OR
75Ω INPUT TERMINATED EQUIPMENT
FIGURE 24B. BACKLOADED TEST CIRCUIT FOR VIDEO
CABLE APPLICATION. BANDWIDTH AND
LINEARITY FOR R_L LESS THAN 500Ω WILL BE
DEGRADED.
NOTE: Figure 24A illustrates the optimum output load when connecting to input terminated equipment. Figure 24B illustrates backloaded test circuit
for video cable applications.
8
FN7459.1
September 22, 2005