Datasheet

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±15 kV ESD Protected, 3.3 V Single-Channel

RS-232 Line Driver/Receiver

ADM3101E

Rev. C

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FEATURES

460 kbps data rate

1 Tx and 1 Rx

Meets EIA/TIA-232E specifications

0.1 μF charge pump capacitors

Contact discharge: ±8 kV

Air gap discharge: ±15 kV

APPLICATIONS

General-purpose RS-232 data links

Industrial/telecommunications diagnostics ports

FUNCTIONAL BLOCK DIAGRAM

ADM3101E

GND

+3.3V INPU

0.1µF

16V

0.1µF

16V

+3.3V TO +6.6V

VOLTAGE DOUBLER

+6.6V TO –6.6V

VOLTAGE INVERTER

C1+

C1–

C2+

C2–

OUT

CMOS

INPUT

CMOS

OUTPUT

V+

V–

OUT

0.1µF

6.3V

0.1µF

16V

EIA/TIA-232E

OUTPUT

EIA/TIA-232E

INPUT*

*INTERNAL 5k PULL-DOWN

RESISTOR ON THE RS-232 INPUT.

6766-001

Figure 1.

GENERAL DESCRIPTION

The ADM3101E is a high speed, single-channel, RS-232/

ITU-T V.28 transceiver interface device that operates from

a single 3.3 V power supply. Low power consumption makes

it ideal for battery-powered portable instruments.

The ADM3101E conforms to the EIA/TIA-232E and ITU-T V.28

specifications and operates at data rates of up to 460 kbps.

All RS-232 (T

OUT

and R

) and CMOS (T

and R

OUT

) inputs

and outputs are protected against electrostatic discharges (up

to ±15 kV ESD protection).

Because of the ±15 kV ESD protection of the ADM3101E

input/output pins, this device is ideally suited for operation

in electrically harsh environments or where RS-232 cables are

frequently plugged and unplugged.

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 ADM3101E is available in both a 12-lead LFCSP and 16-lead

QSOP, specified over the −40°C to +85°C temperature range.

Summary of content (12 pages)

PAGE 1
±15 kV ESD Protected, 3.3 V Single-Channel RS-232 Line Driver/Receiver ADM3101E FEATURES 460 kbps data rate 1 Tx and 1 Rx Meets EIA/TIA-232E specifications 0.1 μF charge pump capacitors Contact discharge: ±8 kV Air gap discharge: ±15 kV APPLICATIONS General-purpose RS-232 data links Industrial/telecommunications diagnostics ports FUNCTIONAL BLOCK DIAGRAM +3.3V INPUT C1 + 0.1µF 16V C1+ C2 + 0.1µF 16V C2+ CMOS INPUT C1– C2– TIN +3.3V TO +6.6V VOLTAGE DOUBLER +6.6V TO –6.
PAGE 2
ADM3101E TABLE OF CONTENTS Features .............................................................................................. 1 Pin Configurations and Function Descriptions ............................5 Applications ....................................................................................... 1 Typical Performance Characteristics ..............................................6 Functional Block Diagram .............................................................. 1 Theory of Operation ..
PAGE 3
ADM3101E SPECIFICATIONS VCC = 3.3 V ± 0.3 V, C1 to C4 = 0.1 μF, −40°C ≤ TA ≤ +85°C, unless otherwise noted. Table 1.
PAGE 4
ADM3101E ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. Table 2. Parameter VCC V+ V− Input Voltages TIN RIN Output Voltages TOUT ROUT Short-Circuit Duration TOUT Package Information θJA, Thermal Impedance (LFCSP) θJA, Thermal Impedance (QSOP) Operating Temperature Range Industrial (A Version) Storage Temperature Range Pb-Free Temperature (Soldering, 10 sec) Rating −0.3 V to +6 V (VCC − 0.3 V) to +13 V +0.3 V to −13 V −0.3 V to (VCC + 0.
PAGE 5
ADM3101E 10 C2– PIN 1 INDICATOR C1+ 1 9 RIN ADM3101E ROUT 2 8 TOUT 7 V– GND 6 V+ 4 VCC 5 TOP VIEW (Not to Scale) TIN 3 NOTES 1. PADDLE CONNECTED TO GND. THIS CONNECTION IS NOT REQUIRED TO MEET THE ELECTRICAL PERFORMANCES. 06766-002 12 C1– 11 C2+ PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Figure 2.
PAGE 6
ADM3101E TYPICAL PERFORMANCE CHARACTERISTICS 8 8 VCC = 3.3V VCC = 3.3V 6 6 V+ 4 2 2 VOLTAGE (V) 0 –2 –2 –4 Tx OUTPUT LOW 0 200 400 600 800 1000 LOAD CAPACITANCE (pF) –8 06766-003 –8 V– –6 0 4 6 350 CHARGE PUMP IMPEDANCE (Ω) 300 10 Tx OUTPUT (V) 3 Figure 7. Charge Pump V+, V− vs. Load Current 15 Tx OUTPUT HIGH 5 0 –5 Tx OUTPUT LOW –10 V– 250 200 V+ 150 100 50 4 6 5 0 06766-004 3 VCC (V) 3 4 5 VCC (V) Figure 5. Transmitter Output Voltage High/Low vs.
PAGE 7
ADM3101E 5.0 TIN VOLTAGE THRESHOLDS (V) 1 2 4.0 3.5 3.0 2.5 2.0 1.5 1.0 TIME (1µs/DIV) 0 3.0 3.5 4.0 4.5 5.0 VCC (V) Figure 11. TIN Voltage Threshold vs. VCC Figure 10. 460 kbps Data Transmission Rev. C | Page 7 of 12 5.5 06766-010 0.5 VCC = 3.3V LOAD = 3kΩ AND 1nF 06766-009 5V/DIV 5V/DIV 4.
PAGE 8
ADM3101E THEORY OF OPERATION FROM VOLTAGE DOUBLER • A charge pump voltage converter • A 3.3 V logic to an EIA/TIA-232E transmitter • An EIA/TIA-232E to a 3.3 V logic receiver +3.3V INPUT C2 + 0.1µF 16V C2+ CMOS INPUT VCC +3.3V TO +6.6V VOLTAGE DOUBLER TIN V– TOUT T + C3 0.1µF 6.3V V+ +6.6V TO –6.6V VOLTAGE INVERTER C2– ROUT S2 C2 + S4 GND C4 V– = –(V+) RIN R The transmitter driver converts the 3.3 V logic input levels into RS-232 output levels.
PAGE 9
ADM3101E OUTLINE DIMENSIONS 12° MAX 0.50 BSC 0.60 MAX 10 2.95 2.75 SQ 2.55 TOP VIEW PIN 1 INDICATOR 1.00 0.85 0.80 0.60 MAX 9 0.75 0.60 0.50 7 EXPOSED PAD (BOTTOM VIEW) 6 0.20 REF 3 *1.45 1.30 SQ 1.15 4 *PADDLE CONNECTED TO GND. THIS CONNECTION IS NOT REQUIRED TO MEET THE ELECTRICAL PERFORMANCES. 0.05 MAX 0.02 NOM 0.30 0.23 0.18 1 0.25 MIN 0.80 MAX 0.65 TYP SEATING PLANE PIN 1 INDICATOR 12 COPLANARITY 0.08 050808-B 3.15 3.00 SQ 2.
PAGE 10
ADM3101E NOTES Rev.
PAGE 11
ADM3101E NOTES Rev.