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參數(shù)資料
| 型號(hào)： | LTC2845CG#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX 3.3V MULTIPROTCOL 36SSOP |
| 標(biāo)準(zhǔn)包裝： | 37 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 5/5 |
| 規(guī)程： | 多協(xié)議 |
| 電源電壓： | 3.3V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 36-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 36-SSOP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1355 (CN2011-ZH PDF) |
12
LTC2845
sn2845 2845fs
The V.10 receiver configuration in the LTC2845 is shown
in Figure 13. In V.10 mode switch S3 inside the LTC2845
is turned off. The noninverting input is disconnected
inside the LTC2845 receiver and connected to ground.The
cable termination is then the 30k input impedance to
ground of the LTC2845 V.10 receiver.
APPLICATIONS INFORMATION
WU
U
Figure 12. V.10 Receiver Input Impedance
Figure 13. V.10 Receiver Configuration
Figure 14. Typical V.11 Interface
IZ
VZ
–10V
–3.25mA
3.25mA
–3V
3V
10V
2845 F12
R5
20k
LTC2845
RECEIVER
2845 F13
A
'
B
'
C
'
R8
6k
S3
R6
10k
R7
10k
GND
R4
20k
AA
'
B
C
B
'
C
'
GENERATOR
BALANCED
INTERCONNECTING
CABLE
LOAD
CABLE
TERMINATION
RECEIVER
100
MIN
2845 F14
AA
'
CC
'
GENERATOR
BALANCED
INTERCONNECTING
CABLE
LOAD
CABLE
TERMINATION
RECEIVER
2845 F11
Figure 11. Typical V.10 Interface
Figure 15. V.11 Receiver Configuration
1Actually, there is no switch S1 in receivers R2 and R3. However, for simplicity, all termination
networks on the LTC2846 can be treated identically if it is assumed that an S1 switch exists and is
always closed on the R2 and R3 receivers.
R3
124
R5
20k
LTC2846
RECEIVER
2845 F15
A
'
B
'
C
'
R1
51.5
R8
6k
S2
S3
R2
51.5
R6
10k
R7
10k
GND
R4
20k
S1
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.
In V.11 mode, all switches are off except S1 of the
LTC2846’s receivers which connects a 103
differential
termination impedance to the cable as shown in Fig-
ure 151. The LTC2845 only handles control signals, so no
termination other than its V.11 receivers’ 30k input imped-
ance is necessary.
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