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參數(shù)資料
| 型號： | MAX13410EESA+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS-485 LDO/CTRL 8-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS485 |
| 電源電壓： | 6 V ~ 28 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm Width）裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 8-SO 裸露焊盤 |
| 包裝： | 帶卷 (TR) |
ground loops. The typical application circuits show an
isolated RS-485 interface using the MAX13410E–
MAX13415E. The transceiver is powered separately from
the controlling circuitry. The AutoDirection feature of the
MAX13412E/MAX13413E (see the
AutoDirection Circuitry
section) requires only two optocouplers to electrically
isolate the transceiver.
An isolated RS-485 interface electrically isolates differ-
ent nodes on the bus to protect the bus from problems
due to high common-mode voltages that exceed the
RS-485 common-mode voltage range. An isolated RS-
485 interface has two additional design challenges not
normally associated with RS-485 design. These are 1)
isolating the control signals and 2) getting isolated
power to the transceiver. Optical isolators are the most
common way of getting the control signals across the
isolation barrier.
Isolated power is typically done using a transformer in
either a push-pull or flyback configuration. The MAX845
is an example of an inexpensive, unregulated push-pull
converter (see Figure 12). While in theory, the output of
an unregulated push-pull converter is predictable, the
output voltage can vary significantly due to the non-ideal
characteristics of the transformer, load variations, and
temperature drift of the diodes, etc. Variances of ±20%
or more would not be uncommon. This would require the
addition of a linear regulator to get standard RS-485
transceivers to work. Since the MAX13410E–
MAX13415E have the linear regulator built in, this exter-
nal regulator and its associated cost and size penalties
are not necessary. A nominal +7.5V output with a ±20%
tolerance would provide a +6V to +9V supply voltage.
This is well within the operating range of the
MAX13410E–MAX13415E. If the output tolerance is even
greater than ±20%, adjust the design of the power sup-
ply for a higher output voltage to ensure the minimum
input voltage requirements are met.
Flyback converters are typically regulated. A TL431 type
error amplifier and an optical isolator usually close the
loop. The MAX5021 is an example of a small, inexpen-
sive, flyback controller (see Figure 13). While the prima-
ry output of the flyback converter is tightly regulated,
secondary outputs will not be. As with the unregulated
push-pull converter, the MAX13410E–MAX13415E are
ideally suited for use with these secondary outputs.
MAX13410E–MAX13415E
RS-485 Transceiver with Integrated Low-Dropout
Regulator and AutoDirection Control
A
GND
DI
1
2
8
7
VCC
B
VREG
RO
3
4
6
5
R
D
+
MAX13412E
MAX13413E
LDO
RE
ISO_VCC
MCU AND
RELATED
CIRCUITRY
VSYS
0.1
μF
Rt
ISO_VCC
1
μF
CS
DETECT
CIRCUIT
ISO_VCC
UNREGULATED ISOLATED
POWER SUPPLY
Figure 10. Typical Application Circuit for the MAX13412E/MAX13413E
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX13411EESA+ | 功能描述:RS-485接口IC Ic Txrx RS-485 Ldo/Ctrl RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX13411EESA+T | 功能描述:RS-485接口IC Ic Txrx RS-485 Ldo/Ctrl RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX13412EESA+ | 功能描述:RS-485接口IC Ic Txrx RS-485 Ldo/Ctrl RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX13412EESA+T | 功能描述:RS-485接口IC Ic Txrx RS-485 Ldo/Ctrl RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX13413EESA+ | 功能描述:RS-485接口IC Ic Txrx RS-485 Ldo/Ctrl RoHS:否 制造商:Texas Instruments 數(shù)據(jù)速率:250 Kbps 工作電源電壓:3.3 V 電源電流:750 uA 工作溫度范圍:- 40 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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