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參數(shù)資料
| 型號： | ADM238LJR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | QUAD LINE TRANSCEIVER, PDSO24 |
| 封裝： | MS-013AD, SOIC-24 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 364K |
| 代理商： | ADM238LJR |
ADM223/ADM230L–ADM241L
–12–
REV. 0
10
90
100
0%
5V
0.8 V
A3
5V
5
B
Lw
1ms
H
O
Figure 30. Charge Pump, V+, V– Exiting Shutdown
10
90
100
0%
5V
0.8 V
A3
5
B
Lw
5μs
H
O
Figure 31. Transmitter Output Loaded Slew Rate
10
90
100
0%
5V
0.8 V
A3
5
B
Lw
1μs
H
O
Figure 32. Transmitter Output Unloaded Slew Rate
GE NE RAL INFORMAT ION
T he ADM223/ADM230L–ADM241L family of RS-232 drivers/
receivers are designed to solve interface problems by meeting
the EIA-232-E specifications while using a single digital +5 V
supply. T he EIA-232-E standard requires transmitters which
will deliver
±
5 V minimum on the transmission channel and
receivers which can accept signal levels down to
±
3 V. T he
ADM223/ADM230L–ADM241L meet these requirements by
integrating step up voltage converters and level shifting trans-
mitters and receivers onto the same chip. CMOS technology is
used to keep the power dissipation to an absolute minimum. A
comprehensive range of transmitter/receiver combinations is
available to cover most communications needs.
T he ADM223, ADM230L, ADM235L, ADM236L and
ADM241L are particularly useful in battery powered systems as
they feature a low power shutdown mode which reduces power
dissipation to less than 5
μ
W.
T he ADM233L and ADM235L are designed for applications
where space saving is important as the charge pump capacitors
are molded into the package.
T he ADM231L and ADM239L include only a negative charge
pump converter and are intended for applications where a posi-
tive 12 V is available.
T o facilitate sharing a common line or for connection to a micro-
processor data bus the ADM235L, ADM236L, ADM239L and
ADM241L feature an enable (EN,
EN
) function. When disabled,
the receiver outputs are placed in a high impedance state.
CIRCUIT DE SCRIPT ION
T he internal circuitry in the ADM230L–ADM241L consists of
three main sections. T hese are:
(a) A charge pump voltage converter
(b) RS-232 to T T L/CMOS receivers
(c) T T L/CMOS to RS-232 transmitters
Charge Pump DC-DC Voltage Converter
T he charge pump voltage converter consists of an oscillator and
a switching matrix. T he converter generates a
±
10 V supply
from the input 5 V level. T his is done in two stages using a
switched capacitor technique as illustrated in Figures 33 and 34.
First, the 5 V input supply is doubled to 10 V using capacitor
C1 as the charge storage element. T he 10 V level is then in-
verted to generate –10 V using C2 as the storage element.
S1
S3
V+ = 2V
CC
S2
S4
INTERNAL
OSCILLATOR
C1
C3
V
CC
GND
V
CC
Figure 33. Charge-Pump Voltage Doubler
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADM238LJR-REEL | 功能描述:IC TXRX QUAD RS-232 5VLP 24SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:121 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:RS422，RS485 電源電壓:3 V ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-DFN（3x3） 包裝:管件 |
| ADM238LJRZ | 功能描述:IC TX/RX QUAD RS-232 5VLP 24SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:RS-232 & USB Transceiver 標(biāo)準(zhǔn)包裝:2,000 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱:296-19849-2 |
| ADM238LJRZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:5 V-Powered CMOS RS-232 Drivers/Receivers |
| ADM238LJRZ-REEL | 功能描述:IC TXRX RS-232 4:4 5V LP 24SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:121 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:RS422，RS485 電源電壓:3 V ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-DFN（3x3） 包裝:管件 |
| ADM238LJRZ-REEL1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:5 V-Powered CMOS RS-232 Drivers/Receivers |
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