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參數(shù)資料
| 型號： | LTC1345ISW#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX V.35 SINGL SUPPLY 28SOIC |
| 標準包裝： | 1,000 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 2/3 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 28-SOIC |
| 包裝： | 帶卷 (TR) |
7
LTC1345
Review of CCITT Recommendation V.35
Electrical Specifications
V.35 is a CCITT recommendation for synchronous data
transmission via modems. Appendix 2 of the recommen-
dation describes the electrical specifications which are
summarized below:
1. The interface cable is balanced twisted-pair with 80
to
120
impedance.
2. The transmitter’s source impedance is between 50
and
150
.
3. The transmitter’s resistance between shorted terminals
and ground is 150
±15.
4. When terminated by a 100
resistive load, the terminal-
to-terminal voltage should be 0.55V
±20%.
5. The transmitter’s rise time should be less than 1% of the
signal pulse or 40ns, whichever is greater.
6. The common-mode voltage at the transmitter output
should not exceed 0.6V.
7. The receiver impedance is 100
±10.
8. The receiver impedance to ground is 150
±15.
9. The transmitter or receiver should not be damaged by
connection to earth ground, short-circuiting, or cross
connection to other lines.
10. No data errors should occur with
±2V common-mode
change at either the transmitter or receiver, or
±4V ground
potential difference between transmitter and receiver.
Cable Termination
Each end of the cable connected to an LTC1345 must be
terminated by either one of two electrically equivalent
external Y or
resistor networks for proper operation. The
Y-termination has two series connected 50
resistors and
a 125
resistor connected between ground and the center
tap of the two 50
resistors as shown in Figure 6A.
Figure 6. Y and
Termination Networks
50
50
125
A
LTC1345 F06
300
300
120
B
The alternative
-termination has a 120 resistor across
the twisted wires and two 300
resistors between each
wire and ground as shown in Figure 6B. Standard 1/8W,
5% surface mount resistors can be used for the termination
network. To maintain the proper differential output swing,
the resistor tolerance must be 5% or less. A termination
network that combines all the resistors into an SO-14
package is available from:
BI Technologies (Formerly Beckman Industrial)
Resistor Networks
4200 Bonita Place
Fullerton, CA 92635
Phone: (714) 447-2357
FAX: (714) 447-2500
Part #: BI Technologies 627T500/1250 (SOIC)
899TR50/125 (DIP)
APPLICATIO S I FOR ATIO
WU
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