参数资料
型号: LTC2859CDD#TRPBF
厂商: Linear Technology
文件页数: 4/18页
文件大小: 0K
描述: IC TXRX RS485 20MBPS 10-DFN
标准包装: 2,500
类型: 收发器
驱动器/接收器数: 1/1
规程: RS485
电源电压: 4.5 V ~ 5.5 V
安装类型: 表面贴装
封装/外壳: 10-WFDFN 裸露焊盘
供应商设备封装: 10-DFN(3x3)
包装: 带卷 (TR)
LTC2859/LTC2861
12
285961fc
The integrated termination resistor has a high frequency
response which does not limit performance at the maxi-
mum specified data rate. Figure 12 shows the magnitude
and phase of the termination impedance vs frequency. The
termination resistor cannot be enabled by TE if the device
is unpowered or in thermal shutdown mode.
Supply Current
The unloaded static supply currents in the LTC2859/
LTC2861areverylow—typicallyunder700Aforallmodes
of operation without the internal terminator enabled. In
applications with resistively terminated cables, the supply
currentisdominatedbythedriverload.Forexample,when
usingtwo120terminatorswithadifferentialdriveroutput
voltage of 2V, the DC current is 33mA, which is sourced
by the positive voltage supply. This is true whether the
terminatorsareexternalorinternalsuchasintheLTC2859/
LTC2861. Power supply current increases with toggling
data due to capacitive loading and this term can increase
significantly at high data rates. Figure 13 shows supply
current vs data rate for two different capacitive loads (for
the circuit configuration of Figure 3).
High Speed Considerations
A ground plane layout is recommended for the LTC2859/
LTC2861. A 0.1F bypass capacitor less than one quarter
inch away from the VCC pin is also recommended. The PC
board traces connected to signals A/B and Z/Y (LTC2861)
shouldbesymmetricalandasshortaspossibletomaintain
good differential signal integrity. To minimize capacitive
effects, the differential signals should be separated by
more than the width of a trace and should not be routed
on top of each other if they are on different signal planes.
Care should be taken to route outputs away from any sen-
sitive inputs to reduce feedback effects that might cause
noise, jitter, or even oscillations. For example, in the full
duplex LTC2861, DI and A/B should not be routed near
the driver or receiver outputs.
The logic inputs of the LTC2859/LTC2861 have 50mV of
hysteresis to provide noise immunity. Fast edges on the
outputscancauseglitchesinthegroundandpowersupplies
whichareexacerbatedbycapacitiveloading.Ifalogicinput
is held near its threshold (typically 1.5V), a noise glitch
Figure 11. Termination Resistance
vs Common Mode Voltage
Figure 12. Termination Magnitude
and Phase vs Frequency
Figure 13. Supply Current vs Data Rate
applicaTions inFormaTion
COMMON MODE VOLTAGE (V)
–10
RESIST
ANCE
()
130
140
10
285961 F11
120
110
–5
0
5
15
150
10–1
100
FREQUENCY (MHz)
MAGNITUDE
()
PHASE
(°)
101
80
95
110
125
140
155
170
185
–75
–60
–45
–30
–15
0
15
30
285455 F12
MAGNITUDE
PHASE
105
DATA RATE (kbps)
102
45
50
55
60
65
70
75
CURRENT
(mA)
103
104
285961 F13
RDIFF = 54
CL = 1000pF
CL = 100pF
相关PDF资料
PDF描述
24282-31SG-300 CONN RCPT 31POS PNL MNT SKT
VI-23L-MX-F4 CONVERTER MOD DC/DC 28V 75W
VI-23L-MX-F3 CONVERTER MOD DC/DC 28V 75W
AD7714ARSZ-5 IC ADC 24BIT SIGMA-DELTA 28SSOP
VI-26D-CU-F1 CONVERTER MOD DC/DC 85V 200W
相关代理商/技术参数
参数描述
LTC2859HDD#PBF 功能描述:IC LINEAR 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:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232,RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC(0.295",7.50mm 宽) 供应商设备封装:28-SOIC 包装:管件
LTC2859HDD#TRPBF 功能描述:IC LINEAR 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:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232,RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC(0.295",7.50mm 宽) 供应商设备封装:28-SOIC 包装:管件
LTC2859IDD 制造商:Linear Technology 功能描述:Single Transmitter/Receiver RS-422/RS-485 10-Pin DFN EP
LTC2859IDD#PBF 功能描述:IC TXRX RS485 20MBPS 10-DFN 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
LTC2859IDD#PBF 制造商:Linear Technology 功能描述:IC RS-422/RS-485 TRANSCEIVER 5V DFN10