MAX3408EUK+T Maxim Integrated Products, MAX3408EUK+T Datasheet - Page 4

• Manufacturer Part Number: MAX3408EUK+T
• Description: IC TERMINATION NETWORK SOT23-5
• Manufacturer: Maxim Integrated Products
• Type: Cabler

Specifications of MAX3408EUK+T

• Number Of Terminations: 1
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

75Ω/100Ω/120Ω Switchable Termination
Networks
The MAX3406/MAX3407/MAX3408 are line-terminating
networks. They provide 75Ω, 100Ω, and 120Ω termina-
tion to be compatible with twisted pair or coaxial cable.
The MAX3406/MAX3407/MAX3408 consume only 50µA
supply current and operate from a +4.5V to +5.5V
power supply. They are available in a space-saving 5-
pin SOT23 package. All specifications are guaranteed
over the extended temperature range of -40°C to
+85°C.
The ENABLE pin allows switching from one termination
value to another: 75Ω to 100Ω for the MAX3406, 75Ω to
120Ω for the MAX3407, and 100Ω to 120Ω for the
MAX3408 (Figure 1 and Table 1).
4
(V
CC
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= +5V, T
74.40
PIN
1
2
3
4
5
74.60
ACCURACY DISTRIBUTION
A
= +25°C, unless otherwise noted.)
74.80
RESISTANCE (Ω)
ENABLE
75Ω MODE
NAME
GND
V
B
A
75.00 75.20 75.40 75.60
CC
Detailed Description
Supply Voltage +4.5V to +5.5V. Bypass to GND with a 0.1µF capacitor.
Ground
Digital Control Input. Drive ENABLE high to turn on the internal switch, pull ENABLE low to disable
the internal switch.
Cable Terminator Terminal B
Cable Terminator Terminal A
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Typical Operating Characteristics (continued)
98.8
99.2
ACCURACY DISTRIBUTION
99.6
RESISTANCE (Ω)
100Ω MODE
100.0 100.4 100.8 101.2
In order for the MAX3406/MAX3407/MAX3408 to termi-
nate transmission lines correctly, they should look like a
precision resistance. These devices look this way under
all operating conditions as can be seen from the Typical
Operating Characteristics. The very small variations in
resistance with temperature, input voltage, and frequen-
cy should not be of any concern in most applications,
though the users should be aware of them. The next
three sections describe these variations and explain
what end application effect they could have.
The function of a termination is to minimize line reflec-
tions by terminating a transmission line in its character-
istic impedance. The reflection coefficient for a line of
Z0 characteristic impedance terminated with a given
ZL is:
Voltage Reflection Coefficient = (ZL - Z0)/(ZL + Z0)
FUNCTION
Applications Information
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118.5
119.0
ACCURACY DISTRIBUTION
Pin Description
119.5
RESISTANCE (Ω)
120Ω MODE
120.0 120.5 121.0 121.5