adm3485 Analog Devices, Inc., adm3485 Datasheet - Page 15

• Manufacturer Part Number: adm3485
• Description: 3.3 V Slew Rate Limited, Half- And Full-duplex, Rs-485/rs-422 Transceivers
• Manufacturer: Analog Devices, Inc.

LINE LENGTH VS. DATA RATE
The RS-485 and RS-422 standards cover line lengths up to 4000 feet. For line lengths greater than 4000 feet, see Figure 36.
RO
RE
DE
NOTES
1. R
DI
T
RO
DE
NOTES
1. R
RE
DI
IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE.
T
ADM3491
IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE.
MASTER
D
R
ADM3483/
ADM3485
D
R
A
B
Z
Y
ADM3491
A
B
R
R
R
V
T
V
T
T
SLAVE
CC
CC
R2
R1
R2
R1
ADM3483/
ADM3485
Figure 32. ADM3483/ADM3485 Typical Half-Duplex RS-485 Network
A
RO
R
RO
Figure 33. ADM3491 Typical Full-Duplex RS-485 Network
R
RE
B
A
MAXIMUM NUMBER OF TRANSCEIVERS ON BUS = 32
RE
DE
DE
MAXIMUM NUMBER OF NODES = 32
B
Z
DI
D
DI
D
ADM3483/ADM3485/ADM3488/ADM3490/ADM3491
Rev. B | Page 15 of 20
Y
A
RO
R
RO
R
B
A
RE
RE
DE
DE
B
Z
ADM3483/
ADM3485
DI
D
DI
D
V
Y
CC
SLAVE
ADM3491
R1
R
T
R
R
R2
T
T
A
B
Y
Z
B
A
ADM3483/
ADM3485
ADM3491
SLAVE
R
D
R
D
RO
RE
DE
DI
DI
DE
RE
RO