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參數(shù)資料
| 型號(hào)： | ADM232L |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | High Speed, CMOS RS-233 Drivers/Receivers(CMOS RS-232驅(qū)動(dòng)器/接收器) |
| 中文描述： | 高速，的CMOS的RS - 233驅(qū)動(dòng)器/接收（的CMOS的RS - 232驅(qū)動(dòng)器/接收器） |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 274K |
| 代理商： | ADM232L |
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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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