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ADM1385ARSZ-REEL7

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
Low Power, 3.3 V, RS-232
Line Drivers/Receivers
ADM3202/ADM3222/ADM1385
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.
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.
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.
FUNCTIONAL BLOCK DIAGRAMS
C1+
C2+
C1–
C2–
V
CC
V–
V+
T1
IN
T1
OUT
T2
IN
T2
OUT
R1
OUT
R1
IN
R2
OUT
R2
IN
CMOS
INPUTS
EIA/TIA-232
OUTPUTS
CMOS
OUTPUTS
EIA/TIA-232
INPUTS*
T1
T2
R1
R2
+
+
+
0.1µF
10V
0.1µF
10V
GND
ADM3202
C3
0.1µF
6.3V
+3.3
V
INPUT
+3.3V TO +6.6V
VOLTAGE
DOUBLER
+6.6V TO –6.6V
VOLTAGE
INVERTER
C5
0.1µF
+
C4
0.1µF
10V
+
*INTERNAL 5kΩ PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
00071-001
Figure 1.
C1+
C2+
C1–
C2–
V
CC
V–
V+
T1
IN
T1
OUT
T2
IN
T2
OUT
R1
OUT
R1
IN
R2
OUT
EN
R2
IN
SD
CMOS
INPUTS
EIA/TIA-232
OUTPUTS
CMOS
OUTPUTS
EIA/TIA-232
INPUTS*
T1
T2
R1
R2
+
+
+
0.1µF
10V
0.1µF
10V
GND
ADM3222
C3
0.1µF
6.3V
+3.3
V
INPUT
+3.3V TO +6.6V
VOLTAGE
DOUBLER
+6.6V TO –6.6V
VOLTAGE
INVERTER
C5
0.1µF
+
C4
0.1µF
10V
+
*INTERNAL 5kΩ PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
00071-002
Figure 2.
C1+
C2+
C1–
C2–
V
CC
V–
V+
T1
IN
T1
OUT
T2
IN
T2
OUT
R1
OUT
R1
IN
R2
OUT
DD
R2
IN
SD
CMOS
INPUTS
EIA/TIA-232
OUTPUTS
CMOS
OUTPUTS
EIA/TIA-232
INPUTS*
T1
T2
R1
R2
+
+
0.1µF
10V
0.1µF
10V
GND
ADM1385
+3.3V INPUT
+3.3V TO +6.6V
VOLTAGE
DOUBLER
+6.6V TO –6.6V
VOLTAGE
INVERTER
C5
0.1µF
+
+
+
*INTERNAL 5kΩ PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
00071-003
C3
0.1µF
10V
C4
0.1µF
10V
Figure 3.
ADM3202/ADM3222/ADM1385
Rev. E | Page 2 of 16
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description......................................................................... 1
Functional Block Diagrams............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configurations and Function Descriptions ........................... 5
Pin Configurations (N, RN, RU, and RW Packages)................5
Pin Configurations (RS and RU Packages)................................5
Typical Performance Characteristics ..............................................6
General Description..........................................................................8
Circuit Description .......................................................................8
High Baud Rate..............................................................................9
Outline Dimensions ....................................................................... 10
Ordering Guide .......................................................................... 14
REVISION HISTORY
7/11—Rev. D to Rev. E
Changes to Figure 3.......................................................................... 1
Changes to Table 2............................................................................ 4
Changes to Figure 17........................................................................ 8
Updated Outline Dimensions....................................................... 10
Changes to Ordering Guide .......................................................... 14
8/06—Rev. C to Rev. D
Changes to Table 1............................................................................ 3
Updated Outline Dimensions....................................................... 10
Changes to Ordering Guide .......................................................... 12
9/05—Rev. B to Rev. C
Updated Outline Dimensions....................................................... 10
Changes to Ordering Guide .......................................................... 12
12/01—Rev. A to Rev. B
Changes to Specifications Page....................................................... 2
ADM3202/ADM3222/ADM1385
Rev. E | Page 3 of 16
SPECIFICATIONS
V
CC
= 3.3 V ± 0.3 V, C1 to C4 = 0.1 μF. All specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
DC CHARACTERISTICS
Operating Voltage Range 3.0 3.3 5.5 V
V
CC
Power Supply Current 1.3 3 mA No load
8 12 mA R
L
= 3 kΩ to GND
Shutdown Supply Current 0.01 0.5 μA
LOGIC
Input Logic Threshold Low, V
INL
0.8 V T
IN
Input Logic Threshold High, V
INH
2.0 V T
IN
CMOS Output Voltage Low, V
OL
0.4 V I
OUT
= 1.6 mA
CMOS Output Voltage High, V
OH
V
CC
− 0.6 V I
OUT
= −1 mA
Logic Pull-Up Current 5 10 μA T
IN
= GND to V
CC
1
Output Leakage Current ±10 μA Receivers disabled
RS-232 RECEIVER
EIA-232 Input Voltage Range −30 +30 V
EIA-232 Input Threshold Low 0.6 1.2 V
EIA-232 Input Threshold High 1.6 2.4 V
EIA-232 Input Hysteresis 0.4 V
EIA-232 Input Resistance 3 5 7 kΩ
RS-232 TRANSMITTER
Output Voltage Swing (RS-232) ±5.0 ±5.2 V V
CC
= 3.3 V, all transmitter outputs loaded with 3 kΩ to ground
Output Voltage Swing (RS-562) ±3.7 V V
CC
= 3.0 V
Transmitter Output Resistance 300 Ω V
CC
= 0 V, V
OUT
= ±2 V
RS-232 Output Short-Circuit Current ±15 mA
Output Leakage Current ±25 μA
SD
= low, V
OUT
= 12 V
TIMING CHARACTERISTICS
Maximum Data Rate 460 kbps
V
CC
= 3.3 V, R
L
= 3 kΩ to 7 kΩ, C
L
= 50 pF to 1000 pF, one
Tx switching
Receiver Propagation Delay
TPHL 0.4 1 μs
TPLH 0.4 1 μs
Transmitter Propagation Delay 0.3 1.2 μs R
L
= 3 kΩ, C
L
= 1000 pF
Receiver Output Enable Time 200 ns
Receiver Output Disable Time 200 ns
Transmitter Skew 30 ns
Receiver Skew 300 ns
Transition Region Slew Rate 5.5 10 30 V/μs
Measured from +3 V to −3 V or −3 V to +3 V, V
CC
= +3.3 V;
R
L
= 3 kΩ, C
L
= 1000 pF, T
A
= 25°C
1
ADM1385: Input leakage current typically −10 μA when T
IN
= GND.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

ADM1385ARSZ-REEL7

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Manufacturer:
Analog Devices Inc.
Description:
RS-232 Interface IC High-Speed 2-CH
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