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參數(shù)資料
| 型號： | ADM2491EBRWZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/16頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX HS ESD PROT ISO 16SOIC |
| 標(biāo)準(zhǔn)包裝： | 400 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS422，RS485 |
| 電源電壓： | 3 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC W |
| 包裝： | 帶卷 (TR) |
ADM2491E
Rev. B | Page 15 of 16
TYPICAL APPLICATIONS
Figure 30 and Figure 31 show typical applications of the
ADM2491E in half-duplex and full-duplex RS-485 network
configurations. Up to 32 transceivers can be connected to the
RS-485 bus. To minimize reflections, the line must be terminated
at the receiving end in its characteristic impedance, and stub
lengths off the main line must be kept as short as possible. For
half-duplex operation, this means that both ends of the line
must be terminated because either end can be the receiving end.
NOTES
1. RT IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE.
2. ISOLATION NOT SHOWN.
06985-
030
ADM2491E
RxD
DE TxD
A
B
Z
Y
ADM2491E
RxD
DE TxD
A
B
Z
Y
ADM2491E
A
B
Z
Y
A
B
Z
Y
R1
R2
RT
VCC
R
D
R
D
R
D
R
D
RT
RxD
DE
TxD
RxD
DE
TxD
MAXIMUM NUMBER OF TRANSCEIVERS ON BUS = 32
RE
Figure 30. ADM2491E Typical Half-Duplex RS-485 Network
06985-031
R
D
RxD
RE
TxD
DE
ADM2491E
A
B
Z
Y
R
D
RxD
TxD
DE
A
B
Z
Y
RE
R
D
RxD
TxD
DE
ADM2491E
MASTER
SLAVE
A
B
Z
Y
RE
MAXIMUM NUMBER OF NODES = 32
ADM2491E
R
D
RxD
TxD
DE
A
B
Z
Y
RE
SLAVE
NOTES
1. RT IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE.
RT
VDD
R1
R2
RT
VDD
R1
R2
Figure 31. ADM2491E Typical Full -Duplex RS-485 Network
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