ADM203JN Просмотр технического описания (PDF) - Analog Devices
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ADM203JN Datasheet PDF : 6 Pages
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FEATURES
120 kB Transmission Rate
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
APPLICATIONS
Computers
Peripherals
Modems
Printers
Instruments
High-Speed, 5 V, 0.1 F
CMOS RS-232 Driver/Receivers
ADM202/ADM203
FUNCTIONAL BLOCK DIAGRAMS
5V INPUT
0.1F
6.3V
0.1F
16V
TTL/CMOS
INPUTS*
T1IN
T2IN
TTL/CMOS
OUTPUTS
R1OUT
R2OUT
C1+ +5V TO +10V VCC
VOLTAGE
C1– DOUBLER
V+
C2+ +10V TO –10V
VOLTAGE
V–
C2– INVERTER
T1
T2
R1
R2
GND
ADM202
0.1F
6.3V
0.1F
6.3V
0.1F
16V
T1OUT
T2OUT
RS-232
OUTPUTS
R1IN
R2IN
RS-232
INPUTS**
GENERAL DESCRIPTION
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.
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.
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.
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 400k⍀ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
**INTERNAL 5k⍀ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
5V INPUT
TTL/CMOS
INPUTS*
T1IN
T2IN
TTL/CMOS
OUTPUTS
R1OUT
R2OUT
DO NOT MAKE
CONNECTIONS
TO THESE PINS
INTERNAL
–10V POWER
SUPPLY
INTERNAL
+10V POWER
SUPPLY
VCC
T1
T2
R1
R2
C1+
C2+
C1–
C2+
V–
C2–
V– ADM203
C2–
V+
GND GND
T1OUT
T2OUT
RS-232
OUTPUTS
R1IN
R2IN
RS-232
INPUTS**
*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 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
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