ADM1385ARS-REEL ,High-Speed, 2-Channel RS232/V.28 Interface Devicesspecifications and operates at data ratesEN SDGNDup to 460 kbps.*INTERNAL 5k PULL-DOWN RESISTOR O ..
ADM1385ARS-REEL7 ,High-Speed, 2-Channel RS232/V.28 Interface DevicesCHARACTERISTICSOperating Voltage Range 3.0 3.3 5.5 VV Power Supply Current 1.3 3 mA No LoadCC812 mA ..
ADM1485AN ,+-5 V Low Power EIA RS-485 Transceiverfeatures highoutput impedance when disabled and also when powered down.REV. AInformation furnished ..
ADM1485AR ,+-5 V Low Power EIA RS-485 TransceiverSpecifications subject to change without notice.(V = +5 V 5%. All
ADM1485ARZ-REEL , 5 V Low Power EIA RS-485 Transceiver
ADM1485ARZ-REEL , 5 V Low Power EIA RS-485 Transceiver
AH284-PL-B , HALL-EFFECT SMART FAN MOTOR CONTROLLER
AH285-PL , Hall-Effect Smart Fan Motor Controller
AH285-PL , Hall-Effect Smart Fan Motor Controller
AH286-YG-13 , HALL-EFFECT SMART FAN MOTOR CONTROLLER
AH288-PL-B , HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER
AH288-YL-13 , HIGH VOLTAGE HALL-EFFECT SMART FAN MOTOR CONTROLLER
ADM1385ARS-REEL-ADM1385ARS-REEL7
High-Speed, 2-Channel RS232/V.28 Interface Devices
REV.B
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
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 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 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.
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
*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)
TPC 1.Transmitter Output Voltage High/Low vs. Load
Capacitance @ 460 kbps
TPC 2.Transmitter Output Voltage vs. VCC
TPC 3.Transmitter Output Voltage Low/High vs. Load
TPC 4.Charge Pump V+, V– vs. Load Current
TPC 5.Charge Pump Impedance vs. VCC
TPC 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, enhance-
ment 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 effective if con-
nected 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 1.Typical Operating Circuits
TPC 7.460 kbps Data Transmission
