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參數(shù)資料
| 型號： | LTC2855IDE#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS485/RS422 12-DFN |
| 標準包裝： | 2,500 |
| 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 ~ 3.6 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 12-WFDFN 裸露焊盤 |
| 供應商設備封裝： | 12-DFN（4x3） |
| 包裝： | 帶卷 (TR) |
LTC2854/LTC2855
11
285455fb
Switchable Termination
Proper cable termination is very important for good
signal delity. If the cable is not terminated with its char-
acteristic impedance, reections will result in distorted
waveforms.
The LTC2854/LTC2855 are the rst 3.3V RS485/RS422
transceivers to offer integrated switchable termination
resistors on the receiver input pins. This provides the
advantage of being able to easily change, through logic
control, the line termination for optimal performance when
conguring transceiver networks.
When the TE pin is high, the termination resistor is enabled
and the differential resistance from A to B is 120Ω. Figure
10 shows the I/V characteristics between pins A and B
with the termination resistor enabled and disabled. The
resistance is maintained over the entire RS485 common
mode range of –7V to +12V as shown in Figure 11.
The integrated termination resistor has a high frequency
response which does not limit performance at the maximum
specied data rate. Figure 12 shows the magnitude and
phase of the termination impedance vs frequency.
Figure 10. Curve Trace Between A and B
with Termination Enabled and Disabled
Figure 11. Typical Resistance of the Enabled
Terminator vs Voltage on B Pin
Figure 12. Termination Magnitude
and Phase vs Frequency
10–1
100
FREQUENCY (MHz)
MAGNITUDE
(Ω)
PHASE
(°)
101
80
95
110
125
140
155
170
185
–75
–60
–45
–30
–15
0
15
30
285455 F12
MAGNITUDE
PHASE
COMMON MODE VOLTAGE (V)
–10
RESIST
ANCE
(Ω) 130
140
150
10
285455 F11
120
110
100
–5
0
5
15
VAB = 2V
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| LTC2855IGN#TRPBF | 功能描述:IC TXRX RS485/RS422 16-SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:27 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):3/3 規(guī)程:RS232，RS485 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） 供應商設備封裝:28-SOIC 包裝:管件 |
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| LTC2856CDD-1#TRPBF | 功能描述:IC TXRX RS485/RS422 8-DFN RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:121 系列:- 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 ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-DFN（3x3） 包裝:管件 |
| LTC2856CDD-2#PBF | 功能描述:IC TXRX RS485/RS422 8-DFN RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:121 系列:- 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 ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-DFN（3x3） 包裝:管件 |
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