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ADM1385ARSZ View Datasheet(PDF) - Analog Devices

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ADM1385ARSZ Datasheet PDF : 16 Pages
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FEATURES
460 kbps data rate
Specified at 3.3 V
Meets EIA-232E specifications
0.1 μF charge pump capacitors
Low power shutdown (ADM3222 and ADM1385)
PDIP, SOIC_N, SOIC_W, SSOP, and TSSOP options
Upgrade for MAX3222/MAX3232 and LTC1385
ESD protection to IEC 1000-4-2 (801.2)
on RS-232 pins (ADM3202 only)
±8 kV: contact discharge
±15 kV: air gap discharge
APPLICATIONS
General-purpose RS-232 data link
Portable instruments
Printers, palmtop computers, PDAs
GENERAL DESCRIPTION
The ADM3202/ADM3222/ADM1385 transceivers are high
speed, 2-channel RS-232/V.28 interface devices that operate
from a single 3.3 V power supply. Low power consumption and
a shutdown facility (ADM3222/ADM1385) make them ideal for
battery-powered portable instruments.
The ADM3202/ADM3222/ADM1385 parts conform to the
EIA-232E and CCITT V.28 specifications and operate at data
rates up to 460 kbps.
Four external 0.1 μF charge pump capacitors are used for the
voltage doubler/inverter, permitting operation from a single
3.3 V supply.
The ADM3222 contains additional enable and shutdown
circuitry. The EN input can be used to three-state the receiver
outputs. The SD input is used to power down the charge pump
and transmitter outputs, reducing the quiescent current to less
than 0.5 μA. The receivers remain enabled during shutdown
unless disabled using EN.
The ADM1385 contains a driver disable mode and a complete
shutdown mode.
The ADM3202 is available in a 16-lead PDIP, SOIC_W, and
SOIC_N, as well as a space-saving 16-lead TSSOP. The ADM3222
is available in 18-lead PDIP and SOIC_W and in 20-lead SSOP
and TSSOP. The ADM1385 is available in a 20-lead SSOP,
which is pin-compatible with the LTC1385 CG.
Rev. E
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.
Low Power, 3.3 V, RS-232
Line Drivers/Receivers
ADM3202/ADM3222/ADM1385
FUNCTIONAL BLOCK DIAGRAMS
+3.3V INPUT
0.1µF +
10V
0.1µF +
10V
CMOS
INPUTS
T1IN
T2IN
C1+
+3.3V TO +6.6V
VOLTAGE
VCC
C1– DOUBLER V+
C2+ +6.6V TO –6.6V V–
VOLTAGE
C2– INVERTER
T1
T2
C3
0.1µF
6.3V
C5
0.1µF
C4
0.1µF
10V
T1OUT
T2OUT
EIA/TIA-232
OUTPUTS
CMOS
OUTPUTS
R1OUT
R2OUT
R1
R2
GND ADM3202
R1IN
R2IN
EIA/TIA-232
INPUTS*
*INTERNAL 5kPULL-DOWN RESISTOR
ON EACH RS-232 INPUT
Figure 1.
+3.3V INPUT
0.1µF +
10V
0.1µF +
10V
CMOS
INPUTS
T1IN
T2IN
C1+
+3.3V TO +6.6V
VOLTAGE
VCC
C1– DOUBLER V+
C2+ +6.6V TO –6.6V V–
VOLTAGE
C2– INVERTER
T1
T2
C3
0.1µF
6.3V
C5
0.1µF
C4
0.1µF
10V
T1OUT
T2OUT
EIA/TIA-232
OUTPUTS
CMOS R1OUT
OUTPUTS
R2OUT
R1
R2
R1IN
R2IN
EIA/TIA-232
INPUTS*
EN
GND
SD
ADM3222
*INTERNAL 5kPULL-DOWN RESISTOR
ON EACH RS-232 INPUT
Figure 2.
+3.3V INPUT
0.1µF +
10V
0.1µF +
10V
CMOS
INPUTS
T1IN
T2IN
C1+
+3.3V TO +6.6V
VOLTAGE
VCC
C1– DOUBLER V+
C2+ +6.6V TO –6.6V V–
VOLTAGE
C2– INVERTER
T1
T2
C4
0.1µF
10V
C3
0.1µF
10V
C5
0.1µF
T1OUT
T2OUT
EIA/TIA-232
OUTPUTS
CMOS
OUTPUTS
R1OUT
R2OUT
R1
R2
R1IN
R2IN
EIA/TIA-232
INPUTS*
DD
GND
SD
ADM1385
*INTERNAL 5kPULL-DOWN RESISTOR
ON EACH RS-232 INPUT
Figure 3.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©1998–2011 Analog Devices, Inc. All rights reserved.
 

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