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| 型号： | ADM3493ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 3/12页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS-422/485 3.3V 8-SOIC |
| 标准包装： | 98 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS422，RS485 |
| 电源电压： | 3 V ~ 3.6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 管件 |
| 产品目录页面： | 790 (CN2011-ZH PDF) |
ADM3493
Rev. 0 | Page 11 of 12
CIRCUIT DESCRIPTION
The ADM3493 is a low power transceiver for RS-485 and
RS-422 communications. The ADM3493 can transmit and
receive at data rates up to 250 kbps in a half duplex
configuration. Driver Enable (DE) and Receiver Enable (RE)
pins are included when disabled; the driver and receiver
outputs are high impedance.
Table 5. Transmitting Truth Table
Transmitting Inputs
Transmitting
Outputs
RE
DE
DI
B
A
Mode
1
0
1
Normal
1
0
1
0
Normal
0
High-Z2
Normal
1
0
High-Z2
Shutdown
1 X = Don’t care.
2 High-Z = High Impedance.
Table 6. Receiving Truth Table
Receiving Inputs
Receiving
Outputs
RE
DE
A - B
RO
Mode
0
≥+0.2 V
1
Normal
0
≤0.2 V
0
Normal
0
Inputs Open
1
Normal
1
0
High-Z2
Shutdown
1 X = Don’t care.
2 High-Z = High Impedance
REDUCED EMI AND REFLECTIONS
The ADM3493 is a slew rate limited transceiver, minimizing
EMI and reducing reflections caused by improperly terminated
cables.
LOW POWER SHUTDOWN MODE
A low power shutdown mode is initiated by bringing both RE
high and DE low. The ADM3493 does not shut down unless
both the driver and receiver are disabled (high impedance). In
shutdown, the ADM3493 typically draws only 2 nA of supply
current. For the ADM3493, the tPSH and tPSL enable times assume
the part was in the low power shutdown mode; the tPZH and tPZL
enable times assume the receiver or driver was disabled, but the
part was not shut down.
DRIVER OUTPUT PROTECTION
Two methods are implemented to prevent excessive output
current and power dissipation caused by faults or by bus
contention. Current limit protection on the output stage
provides immediate protection against short circuits over the
whole common-mode voltage range (see Typical Performance
Characteristics). In addition, a thermal shutdown circuit forces
the driver outputs into a high impedance state if the die
temperature rises excessively.
PROPAGATION DELAY
Skew time is simply the difference between the low-to-high and
high-to-low propagation delay. Small driver/receiver skew times
help maintain a symmetrical mark-space ratio (50% duty cycle).
The receiver skew time, |tPRLH - tPRHL|, is 20 ns for the ADM3493.
The driver skew time is typically under 100 ns.
TYPICAL APPLICATIONS
The ADM3493 transceiver is designed for bidirectional data
communications on multipoint bus transmission lines. Figure
22 shows a typical network application’s circuits. To minimize
reflections, the line should be terminated at both ends in its
characteristic impedance, and stub lengths off the main line
should be kept as short as possible. The slew rate limited
ADM3493 is tolerant of imperfect termination.
B
A
R
D
RO
RE
DI
DE
ADM3493
B
A
R
D
RO
RE
DI
DE
B
A
R
D
RO RE
DI
DE
B
A
R
D
RO
RE
DI
DE
05
71
5-
02
8
MAXIMUM NUMBER OF TRANSCEIVERS ON BUS = 256
RT
NOTES
1. RT IS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE.
VCC
R1
R2
Figure 28. ADM3493 Typical Half Duplex RS-485 Network
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADM3493ARZ | 制造商:Analog Devices 功能描述:RS-485 TRANCEIVER IC |
| ADM3493ARZ-REEL7 | 功能描述:IC TXRX RS-422/485 3.3V 8-SOIC 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:121 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:3 V ~ 3.6 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:管件 |
| ADM383 | 制造商:AD 制造商全称:Analog Devices 功能描述:5 V Low Power, Slew-Rate Limited RS-485/RS-422 Transceiver |
| ADM401-1/12VDC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| ADM401-1/24VDC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
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