MAX3045BCWE-T View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX3045BCWE-T Datasheet PDF : 15 Pages
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±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
MAX3043–MAX3045
T1IN
D1
MAX3095
RT
R1
R1OUT
T2IN
D2
RT
R2
R2OUT
T3IN
D3
RT
R3
R3OUT
T4IN
D4
RT
R4
R4OUT
EN
EN
G
G
VCC
GND
VCC
GND
Figure 13. Typical Connection of a Quad Transmitter and a Quad Receiver as a Pair
Typical Multiple-Point Connection
Figure 14 shows a typical multiple-point connection for
the MAX3040–MAX3045 with the MAX3095. Because of
the high frequencies and the distances involved, high
attention must be paid to transmission-line effects while
using termination resistors. A terminating resistor (RT)
is simply a resistor that should be placed at the
extreme ends of the cable to match the characteristic
impedance of the cable. When the termination resis-
tance is not the same value as the characteristic
impedance of the cable, reflections will occur as the
signal is traveling down the cable. Although some
reflections are inevitable due to the cable and resistor
tolerances, large mismatches can cause significant
reflections resulting in errors in the data. With this in
mind, it is very important to match the terminating resis-
tance and the characteristic impedance as closely as
possible. As a general rule in a multi-drop system, termi-
nation resistors should always be placed at both ends of
the cable.
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