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| 型号： | ADM3485EARZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS-485 HS 3.3V 8SOIC |
| 标准包装： | 1,000 |
| 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： | 带卷 (TR) |
| 其它名称： | ADM3485EARZ-REEL7-ND ADM3485EARZ-REEL7TR |
ADM3483/ADM3485/ADM3488/ADM3490/ADM3491
Data Sheet
Rev. E | Page 14 of 20
CIRCUIT DESCRIPTION
The ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 are
low power transceivers for RS-485 and RS-422 communications.
The ADM3483/ADM3488 transmit and receive at data rates up
to 250 kbps; the ADM3485/ADM3490/ADM3491 transmit at up to
10 Mbps. The ADM3488/ADM3490/ADM3491 are full-duplex
transceivers, while the ADM3483/ADM3485 are half-duplex
transceivers. Driver enable (DE) and receiver enable (RE) pins
are included on the ADM3483/ADM3485/ADM3491. When
disabled, the driver and receiver outputs are high impedance.
DEVICES WITH RECEIVER/DRIVER ENABLES
(ADM3483/ADM3485/ADM3491)
Table 8. Transmitting Truth Table
Transmitting Input
Transmitting Output
RE
DE
DI
Mode
X2
1
0
1
Normal
X2
1
0
1
0
Normal
0
Normal
1
0
Shutdown
1 A and B outputs are Y and Z, respectively, for full-duplex part (ADM3491).
2 X = don’t care.
3 High-Z = high impedance.
Table 9. Receiving Truth Table
Receiving Input
Receiving Output
RE
A – B
RO
Mode
0
≥ +0.2 V
1
Normal
0
≤ 0.2 V
0
Normal
0
Inputs Open
1
Normal
1
0
Shutdown
1 DE is a don’t care; X for the full-duplex part (ADM3491).
2 X = don’t care.
3 High-Z = high impedance.
DEVICES WITHOUT RECEIVER/DRIVER ENABLES—
ADM3488/ADM3490
Table 10. Transmitting Truth Table
Transmitting Input
Transmitting Output
DI
Z
Y
1
0
1
0
1
0
Table 11. Receiving Truth Table
Receiving Input
Receiving Output
A – B
RO
≥ +0.2 V
1
≤ 0.2 V
0
Inputs open
1
REDUCED EMI AND REFLECTIONS
(ADM3483/ADM3488)
The ADM3483/ADM3488 are slew rate limited transceivers,
minimizing EMI and reducing reflections caused by improperly
terminated cables.
LOW POWER SHUTDOWN MODE
(ADM3483/ADM3485/ADM3491)
A low power shutdown mode is initiated by bringing RE high
and DE low. The devices do not shut down unless both the driver
and receiver are disabled (high impedance). In shutdown mode,
the devices typically draw only 2 nA of supply current. For these
devices, the tPSH and tPSL enable times assume the part is in the
low power shutdown mode; the tPZH and tPZL enable times assume
the receiver or driver was disabled, but the part is 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 the Typical Performance Characteristics section).
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 the difference between the low-to-high and high-
to-low propagation delays. Small driver/receiver skew times help
maintain a symmetrical mark-space ratio (50% duty cycle).
The receiver skew time (|tPRLH tPRHL|) is under 10 ns (20 ns
for ADM3483/ADM3488). The driver skew times are 8 ns for
ADM3485/ADM3490/ADM3491 and typically under 100 ns for
ADM3483/ADM3488.
TYPICAL APPLICATIONS
The ADM3483/ADM3485/ADM3491 transceivers are designed
for half-duplex bidirectional data communications on multipoint
network applications circuits. The ADM3488 and the ADM3490
full-duplex transceivers are designed to be used in a daisy-chain
network topology or in a point-to-point application, see Figure 34
To minimize reflections, the line must be terminated at both
ends in its characteristic impedance, and stub lengths off the main
line must be kept as short as possible. The slew rate limited
ADM3483/ADM3488 are more tolerant of imperfect termination.
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| ADM3486E | 制造商:AD 制造商全称:Analog Devices 功能描述:3.3 V, 【15 kV ESD-Protected, Half- and Full-Duplex, RS-485/RS-422 Transceivers |
| ADM3486EARZ | 功能描述:IC TXRX RS-485 3.3V HD 8-SOIC 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 |
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| ADM3488ARZ | 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:98 系列:* |
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