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ADM203_15

更新时间： 2024-11-21 01:21:55
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亚德诺 - ADI /
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6页 127K
描述
CMOS RS-232 Driver/Receivers

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ADM203_15 数据手册

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High-Speed, 5 V, 0.1 ␮F  
CMOS RS-232 Driver/Receivers  
a
ADM202/ADM203  
FEATURES  
FUNCTIONAL BLOCK DIAGRAMS  
120 kB Transmission Rate  
5V INPUT  
ADM202: Small (0.1 ␮F) Charge Pump Capacitors  
ADM203: No External Capacitors Required  
Single 5 V Power Supply  
Meets EIA-232-E and V.28 Specifications  
Two Drivers and Two Receivers  
On-Board DC-DC Converters  
؎9 V Output Swing with 5 V Supply  
Low Power BiCMOS: 2.0 mA ICC  
؎30 V Receiver Input Levels  
0.1␮F  
V
C1+  
C1–  
CC  
+5V TO +10V  
VOLTAGE  
DOUBLER  
6.3V  
0.1␮F  
6.3V  
0.1␮F  
6.3V  
V+  
V–  
C2+  
C2–  
+10V TO –10V  
VOLTAGE  
INVERTER  
0.1␮F  
16V  
0.1␮F  
16V  
T1  
IN  
T1  
T1  
T2  
R1  
R2  
OUT  
TTL/CMOS  
INPUTS*  
RS-232  
APPLICATIONS  
Computers  
Peripherals  
Modems  
Printers  
Instruments  
OUTPUTS  
T2  
IN  
T2  
OUT  
R1  
R1  
IN  
OUT  
TTL/CMOS  
OUTPUTS  
RS-232  
INPUTS**  
R2  
R2  
IN  
OUT  
GND  
ADM202  
*INTERNAL 400k⍀ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.  
**INTERNAL 5k⍀ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.  
GENERAL DESCRIPTION  
5V INPUT  
The ADM202/ADM203 is a two-channel RS-232 line driver/  
receiver pair designed to operate from a single 5 V power sup-  
ply. A highly efficient on-chip charge pump design permits  
RS-232 levels to be developed using charge pump capacitors as  
small as 0.1 µF. The capacitors are internal to the package on  
the ADM203 so no external capacitors are required. These  
converters generate 10 V RS-232 output levels.  
V
CC  
T1  
T2  
T1  
T2  
T1  
T2  
IN  
OUT  
TTL/CMOS  
INPUTS*  
RS-232  
OUTPUTS  
IN  
OUT  
The ADM202/ADM203 meets or exceeds the EIA-232-E and  
V.28 specifications. Fast driver slew rates permit operation up to  
120 kB while high-drive currents allow for extended cable lengths.  
R1  
R1  
R2  
R1  
R2  
OUT  
OUT  
IN  
TTL/CMOS  
OUTPUTS  
RS-232  
INPUTS**  
R2  
IN  
An epitaxial BiCMOS construction minimizes power consump-  
tion to 10 mW and also guards against latch-up. Overvoltage  
protection is provided allowing the receiver inputs to withstand  
continuous voltages in excess of 30 V. In addition, all pins  
contain ESD protection to levels greater than 2 kV.  
C1+  
C1–  
V–  
DO NOT MAKE  
CONNECTIONS  
TO THESE PINS  
C2+  
C2+  
C2–  
C2–  
INTERNAL  
–10V POWER  
SUPPLY  
V–  
ADM203  
The ADM202 is available in 16-lead DIP and both narrow and  
wide SOIC packages. The ADM203 is available in a 20-lead  
DIP package.  
INTERNAL  
+10V POWER  
SUPPLY  
V+  
GND  
GND  
*INTERNAL 400k⍀ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.  
**INTERNAL 5k⍀ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.  
REV. A  
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  
which may result from its use. No license is granted by implication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 2001  
123456

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