参数资料
| 型号： | LTC2871IUHF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/36页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS485/RS422 38-QFN |
| 产品培训模块： | LTC2870 and LTC2871 Multi-Protocol Transceivers |
| 标准包装： | 52 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 3/3 |
| 规程： | RS232，RS422，RS485 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 供应商设备封装： | 38-QFN（5x7） |
| 包装： | 管件 |
| 配用： | DC1786A-ND - BOARD DEMO LTC2871 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
LTC2870/LTC2871
21
28701f
Figure 15. RS485 Receiver Input Threshold Characteristics
APPLICATIONS INFORMATION
All devices also feature thermal shutdown protection that
disables the drivers, receivers, and RS485 terminators in
case of excessive power dissipation (see Note 6).
RS485 Balanced Receiver with Full Failsafe Operation
The LTC2870 and LTC2871 receivers use a window com-
parator with two voltage thresholds centered around zero
for low pulse width distortion. As illustrated in Figure 15, for
a differential signal approaching from a negative direction,
the threshold is typically +65mV. When approaching from
the positive direction, the threshold is typically –65mV. Each
of these thresholds has about 25mV of hysteresis (not
shown in the figure). The state of RO reflects the polarity
of A–B in full-duplex mode or Y–Z in half-duplex mode.
This windowing around 0V preserves pulse width and
duty cycle for small input signals with heavily slewed
edges, typical of what might be seen at the end of a very
long cable. This performance is highlighted in Figure 16,
where a signal is driven through 4000 feet of CAT5e cable at
3Mbps. Even though the differential signal peaks at just over
±100mV and is heavily slewed, the output maintains a nearly
perfect signal with almost no duty cycle distortion.
An additional benefit of the window comparator architecture
is excellent noise immunity due to the wide effective dif-
ferential hysteresis (or ‘AC’ hysteresis) of about 130mV for
normal signals transitioning through the window region in
less than approximately 2μs. Increasingly slower signals
will have increasingly less effective hysteresis, limited by
the DC failsafe value of about 25mV.
The LTC2870 and LTC2871 provide full failsafe operation
that guarantees the receiver output will be a logic high
state when the inputs are shorted, left open, or terminated
but not driven, for more than about 2μs. The delay allows
normal data signals to transition through the threshold
region without being interpreted as a failsafe condition.
RS485 Biasing Resistors Not Required
RS485 networks are often biased with a resistive divider
to generate a differential voltage of ≥200mV on the data
lines, which establishes a logic high state when all the
transmitters on the network are disabled. The values of
the biasing resistors depend on the number and type
of transceivers on the line and the number and value of
terminating resistors. Therefore the values of the biasing
resistors must be customized to each specific network
installation, and may change if nodes are added to or
removed from the network.
The internal failsafe feature of the LTC2870 and LTC2871
eliminates the need for external biasing resistors. The
LTC2870 and LTC2871 transceivers will operate correctly
on unbiased, biased or underbiased networks.
28701 F15
RECEIVER
OUTPUT LOW
–200mV
–65mV
0V
RO
65mV
200mV
VAB
RECEIVER
OUTPUT HIGH
Figure 16. A 3Mbps Signal Driven Down 4000ft of CAT 5e
Cable. Top Traces: Received Signals After Transmission
Through Cable; Middle Trace: Math Showing Differences
of Top Two Signals; Bottom Trace: Receiver Output
0.1V/DIV
5V/DIV
28701 F16
200ns/DIV
RO
(A-B)
A
B
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4213IDDB#TRPBF | IC CIRC BREAK ELEC 8-DFN |
| LTC4258CGW#TRPBF | IC POE 802.3AF QUAD 36-SSOP |
| LTC4259ACGW#TR | IC CTRLR POE QUAD AC DISC 36SSOP |
| LTC4264IDE#TRPBF | IC CNTRLR PD INTERFACE 12-DFN |
| LTC4266IGW#PBF | IC CTRLR IEEE 802.3AT 36-SSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC2872CUHF#PBF | 功能描述:IC LINEAR OP AMP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:* 产品培训模块:RS-232 & USB Transceiver 标准包装:2,000 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SSOP（0.209"，5.30mm 宽） 供应商设备封装:16-SSOP 包装:带卷 (TR) 其它名称:296-19849-2 |
| LTC2872CUHF#TRPBF | 功能描述:IC LINEAR OP AMP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:* 标准包装:250 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:带卷 (TR) |
| LTC2872IUHF#PBF | 功能描述:IC TRANSCEIVER RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:* 产品培训模块:RS-232 & USB Transceiver 标准包装:2,000 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-SSOP（0.209"，5.30mm 宽） 供应商设备封装:16-SSOP 包装:带卷 (TR) 其它名称:296-19849-2 |
| LTC2872IUHF#TRPBF | 功能描述:IC RS232 TRANSCEIVER RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:* 标准包装:250 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:带卷 (TR) |
| LTC2874IFE#PBF | 制造商:Linear Technology 功能描述:IC CONTROLLER HOT SWAP 38TSSOP |
发布紧急采购，3分钟左右您将得到回复。