ADM3222AN ,Low Power, +3.3 V, RS-232 Line Drivers/Receiversspecifications and operates at data ratesup to 460 kbps.R1 R1R1OUT INCMOSEIA/TIA-232OUTPUTSFour ext ..
ADM3222ARS ,Low Power, +3.3 V, RS-232 Line Drivers/Receiversspecifications T to T unless otherwise noted.)CC MIN MAXParameter Min Typ Max Unit Test Conditions/ ..
ADM3222ARU ,Low Power, +3.3 V, RS-232 Line Drivers/Receiversspecifications T to T unless otherwise noted.)CC MIN MAXParameter Min Typ Max Unit Test Conditions/ ..
ADM3222ARU-REEL , Low Power, 3.3 V, RS-232 Line Drivers/Receivers
ADM3222ARUZ-REEL , Low Power, 3.3 V, RS-232 Line Drivers/Receivers
ADM3222ARW ,Low Power, +3.3 V, RS-232 Line Drivers/ReceiversSpecifications10V+V+C1– DOUBLER 0.1F 0.1F6.3V0.1 F Charge Pump CapacitorsC2+ +6.6V TO –6.6V V–Lo ..
AIC1117-33CE , 800mA Low Dropout Positive Adjustable Regulator
AIC1117-33CM , 800mA Low Dropout Positive Adjustable Regulator
AIC1117-50CE , 800mA Low Dropout Positive Adjustable Regulator
AIC1117-50CE , 800mA Low Dropout Positive Adjustable Regulator
AIC1117-50CY , 800mA Low Dropout Positive Adjustable Regulator
AIC1117A-33 , 1A Low Dropout Positive Adjustable Regulator
ADM1385ARS-ADM3202AN-ADM3202ARN-ADM3202ARU-ADM3202ARW-ADM3222AN-ADM3222ARS-ADM3222ARU-ADM3222ARW
Low Power, +3.3 V, RS-232 Line Drivers/Receivers
REV.A
Low Power, +3.3 V, RS-232
Line Drivers/Receivers
FUNCTIONAL BLOCK DIAGRAMSFEATURES
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
APPLICATIONS
General Purpose RS-232 Data Link
Portable Instruments
Printers
Palmtop Computers
PDAs
GENERAL DESCRIPTIONThe 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 EIA-
232E and CCITT V.28 specifications and operates at data rates
up to 460 kbps.
Four external 0.1µF charge pump capacitors are used for the
voltage doubler/inverter permitting operation from a single
+3.3V supply.
The ADM3222 contains additional enable and shutdown cir-
cuitry. 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 0.5µA. 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 20-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.
ADM3202/ADM3222/ADM1385–SPECIFICATIONS*ADM1385: Input leakage current typically –10 µA when TIN = GND.
Specifications subject to change without notice.
(VCC = +3.3 V � 0.3 V, C1–C4 = 0.1 �F. All specifications TMIN to TMAX unless otherwise noted.)
ABSOLUTE MAXIMUM RATINGS*(TA = +25°C unless otherwise noted)
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . (VCC – 0.3 V) to +14 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V to –14 V
Input Voltages
TIN . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to (V+, +0.3 V)
RIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±30 V
Output Voltages
TOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±15 V
ROUT . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to (VCC + 0.3 V)
Short Circuit Duration
TOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
Power Dissipation
Power Dissipation N-16 . . . . . . . . . . . . . . . . . . . . . 450 mW
(Derate 6 mW/°C above +50°C)
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . 117°C/W
Power Dissipation R-16 . . . . . . . . . . . . . . . . . . . . . 450 mW
(Derate 6 mW/°C above +50°C)
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . 158°C/W
Power Dissipation RU-16 . . . . . . . . . . . . . . . . . . . 500 mW
(Derate 6 mW/°C above +50°C)
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . 158°C/W
Power Dissipation R-18 . . . . . . . . . . . . . . . . . . . . . 450 mW
(Derate 6 mW/°C above +50°C)
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . 158°C/W
Power Dissipation RS-20 . . . . . . . . . . . . . . . . . . . . 450 mW
(Derate 6 mW/°C above +50°C)
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . 158°C/W
Power Dissipation RU-20 . . . . . . . . . . . . . . . . . . . 450 mW
(Derate 6 mW/°C above +50°C)
θJA, Thermal Impedance . . . . . . . . . . . . . . . . . . . 158°C/W
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
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .<1500 V
*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*N = Plastic DIP; R = Small Outline; RS = Shrink Small Outline; RU = Thin
Shrink Small Outline.
ADM3202/ADM3222/ADM1385
PIN FUNCTION DESCRIPTIONSTxOUT
RxIN
PIN CONNECTIONS DIP (N, R Packages)
PIN CONNECTIONS DIP (RS, RU Packages)
Typical Performance CharacteristicsFigure 1.Transmitter Output Voltage High/Low vs. Load
Capacitance @ 230 kbps
Figure 2.Transmitter Output Voltage High vs. VCC
Figure 3.Transmitter Output Voltage Low/High vs. Load
Figure 4.Charge Pump V+, V– vs. Current
Figure 5.Charge Pump Impedance vs. VCC
Figure 6.Power Supply Current vs. Load Capacitance
ADM3202/ADM3222/ADM1385
GENERAL DESCRIPTIONThe ADM3202/ADM3222/ADM1385 are RS-232 line drivers/
receivers. Step-up voltage converters coupled with level shifting
transmitters and receivers allow RS-232 levels to be developed
while operating from a single +3.3 V supply.
CMOS technology is used to keep the power dissipation to an
absolute minimum, allowing maximum battery life in portable
applications.
The ADM3202/ADM3222/ADM1385 is a modification, en-
hancement and improvement to the AD230–AD241 family and
its derivatives. It is essentially plug-in compatible and does not
have materially different applications.
CIRCUIT DESCRIPTIONThe internal circuitry consists of three main sections. These are:A charge pump voltage converter3.3V logic to EIA-232 transmittersEIA-232 to 5V logic receivers.
Charge Pump DC-DC Voltage ConverterThe charge pump voltage converter consists of a 200 kHz oscil-
lator and a switching matrix. The converter generates a ±6.6V
supply from the input +3.3 V level. This is done in two stages
using a switched capacitor technique as illustrated below. First,
the +3.3V input supply is doubled to +6.6 V using capacitor
C1 as the charge storage element. The +6.6V level is then
inverted to generate –6.6 V using C2 as the storage element. C3
is shown connected between V+ and VCC, but is equally effec-
tive if connected between V+ and GND.
Capacitors C3 and C4 are used to reduce the output ripple.
Their values are not critical and can be increased if desired.
Capacitor C3 is shown connected between V+ and VCC. It is
also acceptable to connect this capacitor between V+ and GND.
If desired, larger capacitors (up to 10 µF) can be used for
capacitors C1–C4.
Figure 8.Typical Operating Circuits
Figure 7.230 kbps Data Transmission
