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ADM238LJNZ1

更新时间： 2024-11-02 12:31:39
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亚德诺 - ADI 驱动器
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5 V-Powered CMOS RS-232 Drivers/Receivers

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ADM238LJNZ1 数据手册

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5 V-Powered  
CMOS RS-232 Drivers/Receivers  
ADM231L–ADM234L/ADM236L–ADM241L  
FEATURES  
ADM236L TYPICAL OPERATING CIRCUIT  
Single 5 V power supply  
Meets all EIA-232-E and V.28 specifications  
120 kbps data rate  
On-board dc-to-dc converters  
9 V output swing with 5 V supply  
Small 1 µF capacitors  
Low power shutdown ≤1 µA  
30 V receiver input levels  
Latch-up free  
+5V INPUT  
V
C1+  
C1–  
+5V TO +10V  
VOLTAGE  
DOUBLER  
CC  
1µF  
1µF  
+6.3V  
1µF  
+6.3V  
+6.3V  
V+  
V–  
C2+  
C2–  
+10V TO –10V  
VOLTAGE  
INVERTER  
1µF  
+16V  
1µF  
+16V  
T1  
IN  
T1  
T1  
T2  
OUT  
T2  
IN  
T2  
OUT  
TTL/CMOS  
1
INPUTS  
RS-232  
OUTPUTS  
T3  
IN  
T3  
T3  
T4  
R1  
R2  
APPLICATIONS  
Computers  
Peripherals  
Modems  
Printers  
Instruments  
OUT  
T4  
IN  
T4  
OUT  
R1  
R1  
IN  
OUT  
OUT  
RS-232  
INPUTS  
TTL/CMOS  
OUTPUTS  
R2  
R3  
R2  
IN  
2
R3  
IN  
R3  
OUT  
EN  
GENERAL DESCRIPTION  
SD  
GND  
ADM236L  
The ADM2xx family of line drivers/receivers is intended for all  
EIA-232-E and V.28 communications interfaces, especially in  
applications in which 12 V is not available. The ADM236L and  
ADM241L feature a low power shutdown mode that reduces  
power dissipation to less than 5 µW, making them ideally suited  
for battery-powered equipment. The ADM233L does not  
require any external components and is particularly useful in  
applications where printed circuit board space is critical.  
1
INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.  
INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.  
2
Figure 1.  
levels. The ADM231L and ADM239L are designed to operate  
from 5 V and 12 V supplies. An internal +12 V to −12 V charge  
pump voltage converter generates the −12 V supply.  
All members of the ADM2xxL family, except the ADM231L and  
ADM239L, include two internal charge pump voltage converters  
that allow operation from a single 5 V supply. These parts convert  
the 5 V input power to the 1ꢀ V required for RS-232 output  
The ADM2xxL is an enhanced upgrade to the AD2xx family. It  
features lower power consumption, faster slew rate, and the  
ability to operate with smaller (1 µF) capacitors.  
Table 1. Selection Table  
TTL  
Part  
Number  
No. of RS-232 No. of RS-232 External  
Low Power  
Shutdown (SD)  
No. of  
Pins  
Three-State EN  
Power Supply Voltage  
Drivers  
Receivers  
Capacitors  
ADM231L  
ADM232L  
ADM233L  
ADM234L  
ADM236L  
ADM237L  
ADM238L  
ADM239L  
ADM241L  
5 V and 7.5 V to 13.2 V  
5 V  
5 V  
5 V  
5 V  
5 V  
5 V  
2
2
2
4
4
5
4
3
4
2
2
2
0
3
3
4
5
5
2
4
No  
No  
No  
No  
Yes  
No  
No  
No  
Yes  
No  
No  
No  
No  
Yes  
No  
No  
Yes  
Yes  
14  
16  
20  
16  
24  
24  
24  
24  
28  
None  
4
4
4
4
2
4
5 V and 7.5 V to 13.2 V  
5 V  
Rev. C  
Information furnished by Analog Devices is believed to be accurate and reliable.  
However, no responsibility is assumed by Analog Devices for its use, nor for any  
infringements of patents or other rights of third parties that may result from its use.  
Specifications subject to change without notice. No license is granted by implication  
or otherwise under any patent or patent rights of Analog Devices. Trademarks and  
registered trademarks are the property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
© 2005 Analog Devices, Inc. All rights reserved.  
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