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參數(shù)資料
| 型號： | LTC1545 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Software-Selectable Multiprotocol Transceiver(軟件-可選擇多協(xié)議5發(fā)5收收發(fā)器) |
| 中文描述： | 軟件選擇多協(xié)議收發(fā)器（軟件-可選擇多協(xié)議5發(fā)5收收發(fā)器） |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 248K |
| 代理商： | LTC1545 |
9
LTC1545
APPLICATIO
S I
FOR
ATIO
U
W
U
U
Figure 10: Single Port DCE V.35 Mode Selection in the Cable
NC
NC
V
CC
CABLE
10k
1545 F10
11
12
13
14
LTC1543
LTC1545
CONNECTOR
14
13
12
11
15
16
22
21
M2
M1
LTC1344A
LATCH
M0 (DATA)
1
23
24
(DATA)
M0
M1
M2
DCE/DTE
DCE/DTE
M2
M1
M0
D4ENB
R4EN
(DATA)
DCE/
DTE
The V.10 receiver configuration in the LTC1545 is shown
in Figure 13. In V.10 mode switch S3 inside the LTC1545
is turned off. The noninverting input is disconnected
inside the LTC1545 receiver and connected to ground.The
cable termination is then the 30k input impedance to
ground of the LTC1545 V.10 receiver.
V.11 (RS422) Interface
A typical V.11 balanced interface is shown in Figure 14. A
V.11 differential generator with outputs A and B with
ground C is connected to a differential receiver with
ground C
'
, inputs A
'
connected to A, B
'
connected to B. The
V.11 interface has a differential termination at the receiver
end that has a minimum value of 100
. The termination
resistor is optional in the V.11 specification, but for the
high speed clock and data lines, the termination is required
to prevent reflections from corrupting the data. The
receiver inputs must also be compliant with the imped-
ance curve shown in Figure 12.
with the termination in the cable head or separate termina-
tions are built on the board and a custom cable routes the
signals to the appropriate termination. Switching the
terminations with FETs is difficult because the FETs must
remain off even though the signal voltage is beyond the
supply voltage for the FET drivers or the power is off.
Using the LTC1344A along with the LTC1543/LTC1545
solves the cable termination switching problem. Via soft-
ware control, the LTC1344A provides termination for the
V.10 (RS423), V.11 (RS422), V.28 (RS232) and V.35
electrical protocols.
V.10 (RS423) Interface
A typical V.10 unbalanced interface is shown in Figure 11.
A V.10 single-ended generator output A with ground C is
connected to a differential receiver with inputs A
'
con-
nected to A, and input C
'
connected to the signal return
ground C. Usually, no cable termination is required for
V.10 interfaces, but the receiver inputs must be compliant
with the impedance curve shown in Figure 12.
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| LTC1545CG#TRPBF | 功能描述:IC TXRX SOFTWARE SELECTBL 36SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR) |
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