Analog Devices ADM3202 22 1385 b Datasheet
Low Power, 3.3 V, RS-232
a
FEATURES
460 kbps Data Rate
Specified at 3.3 V
Meets EIA-232E Specifications
0.1 F Charge Pump Capacitors
Low Power Shutdown (ADM3222E and ADM1385)
DIP, SO, SOIC, SSOP and TSSOP Package Options
Upgrade for MAX3222/32 and LTC1385
ESD Protection to IEC1000-4-2 (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 which operate
from a single 3.3 V power supply.
Low power consumption and a shutdown facility (ADM3222/
ADM1385) makes them ideal for battery powered portable
instruments.
The ADM3202/ADM3222/ADM1385 conforms to the EIA232E and CCITT V.28 specifications and operates 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 may 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 DIP, narrow and wide
SOIC as well as a space saving 16-lead TSSOP package. The
ADM3222 is available in 18-lead DIP, SO and in 20-lead SSOP
and TSSOP. The ADM1385 is available in a 20-lead SSOP
package, which is pin compatible with the LTC1385 CG.
Line Drivers/Receivers
ADM3202/ADM3222/ADM1385
FUNCTIONAL BLOCK DIAGRAMS
+3.3V INPUT
CMOS
INPUTS
CMOS
OUTPUTS
CMOS
INPUTS
CMOS
OUTPUTS
CMOS
INPUTS
CMOS
OUTPUTS
0.1F
10V
+
0.1F
10V
T1
IN
T2
IN
R1
OUT
R2
OUT
+
0.1F
10V
+
0.1F
10V
T1
IN
T2
IN
R1
OUT
R2
OUT
EN SD
+
0.1F
10V
+
0.1F
10V
T1
IN
T2
IN
R1
OUT
R2
OUT
DD
C1–
+6.6V TO –6.6V
C2+
C2–
+3.3V TO +6.6V
C1+
C1–
+6.6V TO –6.6V
C2+
C2–
+3.3V TO +6.6V
C1+
C1–
+6.6V TO –6.6V
C2+
C2–
VOLTAGE
DOUBLER
VOLTAGE
INVERTER
T1
T2
R1
R2
GND
VOLTAGE
DOUBLER
VOLTAGE
INVERTER
T1
T2
R1
R2
GND
VOLTAGE
DOUBLER
VOLTAGE
INVERTER
T1
T2
R1
R2
GND
+3.3V TO +6.6V
C1+
+
V
CC
V+
V–
+
+
T1
T2
R1
R2
C3
0.1F
6.3V
C4
0.1F
10V
OUT
OUT
IN
IN
+
C5
0.1F
EIA/TIA-232
OUTPUTS
EIA/TIA-232
INPUTS*
ADM3202
*INTERNAL 5k PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
+3.3V INPUT
V
CC
V+
V–
+
+
T1
T2
R1
R2
C3
0.1F
6.3V
C4
0.1F
10V
OUT
OUT
IN
IN
+
C5
0.1F
EIA/TIA-232
OUTPUTS
EIA/TIA-232
INPUTS*
ADM3222
*INTERNAL 5k PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
+3.3V INPUT
V
CC
V+
V–
C4
+
0.1F
10V
ADM1385
*INTERNAL 5k PULL-DOWN RESISTOR
ON EACH RS-232 INPUT
SD
+
C5
0.1F
+
C3
0.1F
6.3V
T1
OUT
EIA/TIA-232
OUTPUTS
T2
OUT
R1
IN
EIA/TIA-232
INPUTS*
R2
IN
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 that
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 www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 2001
ADM3202/ADM3222/ADM1385–SPECIFICATIONS
(VCC = 3.3 V 0.3 V, C1–C4 = 0.1 F. All specifications T
Parameter Min Typ Max Unit Test Conditions/Comments
DC CHARACTERISTICS
Operating Voltage Range 3.0 3.3 5.5 V
Power Supply Current 1.3 3 mA No Load
V
CC
Shutdown Supply Current 0.01 0.5 µA
LOGIC
Input Logic Threshold Low, V
Input Logic Threshold High, V
CMOS Output Voltage Low, V
CMOS Output Voltage High, V
INL
INH
OL
OH
2.0 V T
VCC – 0.6 V I
Logic Pull-Up Current 5 10 µAT
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
Output Voltage Swing (RS-562) ± 3.7 V V
Transmitter Output Resistance 300 Ω V
RS-232 Output Short Circuit Current ± 15 mA
Output Leakage Current ± 25 µA SD = Low, V
TIMING CHARACTERISTICS
Maximum Data Rate 460 kbps VCC = 3.3 V, RL = 3 kΩ to 7 kΩ, CL = 50 pF to
Receiver Propagation Delay 1000 pF. One Tx Switching
TPHL 0.4 1 µs
TPLH 0.4 1 µs
Transmitter Propagation Delay 300 1.2 µsR
Receiver Output Enable Time 200 ns
Receiver Output Disable Time 200 ns
Transmitter Skew 30 ns
Receiver Skew 300 ns
Transition Region Slew Rate Measured from +3 V to –3 V or –3 V to +3 V,
5.5 10 30 V/µsR
*ADM1385: Input leakage current typically –10 µA when TIN = GND.
Specifications subject to change without notice.
to T
MIN
unless otherwise noted.)
MAX
812 mAR
0.8 V T
0.4 V I
= 3 kΩ to GND
L
IN
IN
= 1.6 mA
OUT
= –1 mA
OUT
= GND to V
IN
= 3.3 V. All Transmitter Outputs Loaded
CC
CC
*
with 3 kΩ to Ground
= 3.0 V
CC
= 0 V, V
CC
= 3 kΩ, CL = 1000 pF
L
= +3.3 V
V
CC
= 3 kΩ, CL = 1000 pF, TA = 25°C
L
OUT
OUT
= ± 2 V
= 12 V
–2–
REV. B
ADM3202/ADM3222/ADM1385
ABSOLUTE MAXIMUM RATINGS*
(TA = 25°C unless otherwise noted)
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V
V+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . (V
– 0.3 V) to +14 V
CC
V– . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V to –14 V
Input Voltages
. . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to (V+, +0.3 V)
T
IN
R
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 30 V
IN
Output Voltages
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 15 V
T
OUT
R
. . . . . . . . . . . . . . . . . . . . . . . –0.3 V to (VCC + 0.3 V)
OUT
Short Circuit Duration
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
T
OUT
Power Dissipation
Power Dissipation N-16 . . . . . . . . . . . . . . . . . . . . . 450 mW
(Derate 6 mW/°C above 50°C)
, Thermal Impedance . . . . . . . . . . . . . . . . . . . 117°C/W
θ
JA
Power Dissipation R-16 . . . . . . . . . . . . . . . . . . . . . 450 mW
(Derate 6 mW/°C above 50°C)
, Thermal Impedance . . . . . . . . . . . . . . . . . . . 158°C/W
θ
JA
Power Dissipation RU-16 . . . . . . . . . . . . . . . . . . . 500 mW
(Derate 6 mW/°C above 50°C)
, Thermal Impedance . . . . . . . . . . . . . . . . . . . 158°C/W
θ
JA
Power Dissipation R-18 . . . . . . . . . . . . . . . . . . . . . 450 mW
(Derate 6 mW/°C above 50°C)
, Thermal Impedance . . . . . . . . . . . . . . . . . . . 158°C/W
θ
JA
Power Dissipation RS-20 . . . . . . . . . . . . . . . . . . . . 450 mW
(Derate 6 mW/°C above 50°C)
, Thermal Impedance . . . . . . . . . . . . . . . . . . . 158°C/W
θ
JA
Power Dissipation RU-20 . . . . . . . . . . . . . . . . . . . 450 mW
(Derate 6 mW/°C above 50°C)
, Thermal Impedance . . . . . . . . . . . . . . . . . . . 158°C/W
θ
JA
Operating Temperature Range
Industrial (A Version) . . . . . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . . 300°C
*This is a stress rating only; functional operation of the device at these or any other
conditions above those indicated in the operation sections of this specification
is not implied. Exposure to absolute maximum rating conditions for extended
periods of time may affect reliability.
ORDERING GUIDE
Model Temperature Range Package Options*
ADM3202AN –40°C to +85°C N-16
ADM3202ARN – 40°C to +85°C R-16A
ADM3202ARW –40°C to +85°C R-16
ADM3202ARU –40°C to +85°C RU-16
ADM3222AN –40°C to +85°C N-18
ADM3222ARW –40°C to +85°C R-18
ADM3222ARS –40°C to +85°C RS-20
ADM3222ARU –40°C to +85°C RU-20
ADM1385ARS –40°C to +85°C RS-20
*N = Plastic DIP; R = Small Outline; RS = Shrink Small Outline; RU = Thin
Shrink Small Outline.
–3–REV. B
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