ADM3491AR Analog Devices Inc, ADM3491AR Datasheet - Page 15

• Manufacturer Part Number: ADM3491AR
• Description: 3V FULL DUPLEX RS 485 I.C.
• Manufacturer: Analog Devices Inc
• Type: Transceiverr

Specifications of ADM3491AR

• Rohs Compliant: NO
• Rohs Status: RoHS non-compliant
• Number Of Drivers/receivers: 1/1
• Protocol: RS422, RS485
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL

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. D | Page 15 of 20
Y
A
RO
R
RO
R
B
A
RE
RE
DE
DE
B
Z
ADM3483/
ADM3485
DI
D
DI
D
Y
V
CC
SLAVE
ADM3491
R1
R2
R
T
R
R
T
T
A
B
Z
B
Y
A
ADM3483/
ADM3485
ADM3491
SLAVE
R
D
R
D
RO
RE
DE
DI
DI
DE
RE
RO