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ADM242*

更新时间： 2024-11-01 23:27:55
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亚德诺 - ADI 驱动器
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9页 331K
描述
High Speed. +5 V. 0.1 uF CMOS RS-232 Drivers/Receivers

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ADM242* 数据手册

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High Speed, +5 V, 0.1 µF  
CMOS RS-232 Drivers/Receivers  
a
ADM222/ADM232A/ADM242*  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
200 kB/s Transmission Rate  
Small (0.1 µF) Charge Pump Capacitors  
Single 5 V Power Supply  
+5V INPUT  
0.1µF  
Meets All 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  
±30 V Receiver Input Levels  
0.1µF  
V
CC  
C1+  
+5V TO +10V  
VOLTAGE DOUBLER  
0.1µF  
0.1µF  
V+  
V–  
C1–  
C2+  
+5V TO –10V  
VOLTAGE INVERTER  
Pin Compatible with MAX222/MAX232A/MAX242  
0.1µF  
C2–  
APPLICATIONS  
Computers  
Peripherals  
Modems  
Printers  
Instruments  
T1  
T1  
IN  
T1  
OUT  
TTL/CMOS  
RS-232  
OUTPUTS  
INPUTS  
*
T2  
IN  
T2  
OUT  
T2  
R1  
R1  
IN  
IN  
R1  
OUT  
OUT  
RS-232  
TTL/CMOS  
OUTPUTS  
INPUTS**  
R2  
R2  
R2  
GENERAL DESCRIPTION  
(ADM242)  
EN  
ADM2xx  
The ADM222, ADM232A, ADM242 are a family of high speed  
RS-232 line drivers/receivers offering transmission rates up to  
200 kB/s. Operating from a single +5 V power supply, a highly  
efficient on-chip charge pump using small (0.1 µF) external  
capacitors allows RS-232 bipolar levels to be developed. Two  
RS-232 drivers and two RS-232 receivers are provided on each  
device.  
SHDN  
(ADM222, ADM242)  
GND  
*
INTERNAL 400kΩ PULL-UP RESISTOR  
ON EACH TTL/MOS INPUT  
** INTERNAL 5kΩ PULL-DOWN RESISTOR  
ON EACH RS-232 INPUT  
ORDERING GUIDE  
The devices are fabricated on BiCMOS, an advanced mixed  
technology process which combines low power CMOS with high  
speed bipolar circuitry. This allows for transmission rates up to  
200 kB/s yet minimizes the quiescent power supply current to  
under 5 mA.  
Model  
Temperature Range Package Option  
ADM222AN  
ADM222AR  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
–40°C to +85°C  
N-18  
R-18W  
N-16  
R-16N  
R-16W  
N-18  
ADM232AAN  
ADM232AARN  
ADM232AARW  
ADM242AN  
ADM242AR  
The ADM232A is a pin-compatible, high speed upgrade for the  
AD232 and for the ADM232L. It is available in 16-pin DIP and  
in both narrow and wide surface mount (SOIC) packages.  
The ADM222 contains an additional shutdown (SHDN) func-  
tion which may be used to disable the device thereby reducing  
the supply current to 0.1 µA. During shutdown, all transmit/  
receive functions are disabled. The ADM222 is available in  
18-pin DIP and in a wide surface mount (SOIC) package.  
R-18W  
The ADM242 combines both shutdown (SHDN) and enable  
(EN) functions. The shutdown function reduces the supply  
curent to 0.1 mA. During shutdown, the transmitters are  
disabled but the receivers continue to operate normally. The  
enable function allows the receiver outputs to be disabled  
thereby facilitating sharing a common bus. The ADM242 is  
available in 18-pin DIP and in a wide surface mount (SOIC)  
package.  
*Protected by U.S. Patent No. 5,237,209.  
REV. 0  
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: 617/329-4700 Fax: 617/326-8703  
1234567...9

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