MAX4028/MAX4029
Triple/Quad, 2:1 Video
Multiplexer-Amplifiers with Input Clamps
6 _______________________________________________________________________________________
Pin Description
MAX4029
NAME FUNCTION
—1IN4A Amplifier Input 4A
12IN3A Amplifier Input 3A
23IN2A Amplifier Input 2A
34IN1A Amplifier Input 1A
45 A/B
Channel-Select Input. Drive A/B high or leave floating to select channel A.
Drive A/B low to select channel B.
56KEYREF
Key-Clamp Reference Output. Connect an external resistor from KEYREF to GND to
generate the key-clamp voltage.
67IN1B Amplifier Input 1B
78IN2B Amplifier Input 2B
89IN3B Amplifier Input 3B
—10IN4B Amplifier Input 4B
—11OUT4 Amplifier Output 4
912
CLAMP/KEY_3
Output 3 Clamp or Key-Clamp Input. Drive CLAMP/KEY_3 high to clamp OUT3.
Drive CLAMP/KEY_3 low to key clamp OUT3.
10 13 GND Ground
11 14 OUT3 Amplifier Output 3
12 15
CLAMP/KEY_2
Output 2 Clamp or Key-Clamp Input. Drive CLAMP/KEY_2 high to clamp OUT2.
Drive CLAMP/KEY_2 low to key clamp OUT2.
13 16 OUT2 Amplifier Output 2
14 17 V
CC
Power-Supply Voltage. Bypass V
CC
to GND with 0.1µF and 0.01µF capacitors as
close to the pin as possible.
CLAMP VOLTAGE
vs. TEMPERATURE
MAX4028 toc19
TEMPERATURE (°C)
CLAMP VOLTAGE (V)
7550250-25
0.39
0.40
0.41
0.42
0.43
0.38
0.37
-50 100
Typical Operating Characteristics (continued)
(V
CC
= +5V, GND = 0V, V
DISABLE
= +5V, R
L
= 150Ω to GND, C
IN
= 0.1µF, R
KEYREF
= 6.04kΩ ±1%, T
A
= +25°C, unless otherwise
noted.)
KEY-CLAMP REFERENCE VOLTAGE
vs. R
KEYREF
MAX4028 toc20
R
KEYREF
(kΩ)
KEY-CLAMP REFERENCE VOLTAGE (V)
119753
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0
113
