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ADM222_01

更新时间： 2024-02-29 13:27:53
品牌 Logo 应用领域
亚德诺 - ADI 驱动器
页数 文件大小 规格书
11页 183K
描述
High-Speed, 5 V, 0.1 F CMOS RS-232 Drivers/Receivers

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ADM222_01 数据手册

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High-Speed, 5 V, 0.1 ꢀF  
CMOS RS-232 Drivers/Receivers  
a
ADM222/ADM232A/ADM242  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
200 kB/s Transmission Rate  
Small (0.1 ꢀF) Charge Pump Capacitors  
Single 5 V Power Supply  
5V INPUT  
0.1ꢀF  
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  
0.1ꢀF  
V
CC  
C1+  
+5V TO +10V  
VOLTAGE DOUBLER  
0.1ꢀF  
0.1ꢀF  
V+  
V–  
C1–  
C2+  
+5V TO –10V  
VOLTAGE INVERTER  
Pin Compatible with MAX222/MAX232A/MAX242  
0.1ꢀF  
C2–  
APPLICATIONS  
Computers  
Peripherals  
Modems  
Printers  
Instruments  
T1  
T1  
T1  
IN  
OUT  
TTL/CMOS  
RS-232  
OUTPUTS  
INPUTS  
*
T2  
T2  
T2  
R1  
IN  
OUT  
R1  
R1  
IN  
OUT  
OUT  
RINSP-U23T2S**  
TTL/CMOS  
OUTPUTS  
R2  
R2  
R2  
IN  
ADM2xx  
(ADM242)  
EN  
(ADM222, ADM242)  
GENERAL DESCRIPTION  
SHDN  
GND  
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.  
*
INTERNAL 400kꢂ PULL-UP RESISTOR  
ON EACH TTL/CMOS INPUT  
** INTERNAL 5kꢂ PULL-DOWN RESISTOR  
ON EACH RS-232 INPUT  
functions are disabled. The ADM222 is available in 18-lead  
DIP and in a wide surface-mount (SOIC) package.  
The devices are fabricated on BiCMOS, an advanced mixed  
technology process that 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.  
The ADM242 combines both shutdown (SHDN) and enable  
(EN) functions. The shutdown function reduces the supply  
current to 0.1 mA. During shutdown, the transmitters are dis-  
abled 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-lead DIP and in a wide surface-mount (SOIC)  
package.  
The ADM232A is a pin-compatible, high-speed upgrade for the  
AD232 and for the ADM232L. It is available in 16-lead DIP  
and in both narrow and wide surface-mount (SOIC) packages.  
The ADM222 contains an additional shutdown (SHDN) func-  
tion that may be used to disable the device, thereby reducing the  
supply current to 0.1 µA. During shutdown, all transmit/receive  
REV.  
B
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  
World Wide Web Site: http://www.analog.com  
2010  
781/461-3113  
Fax:  
© Analog Devices, Inc.,  
1234567...11

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