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Isolated, Dual Channel, RS-232 Line

Driver/Receiver

Data Sheet

ADM3252E

Rev. A Document Feedback

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FEATURES

2.5 kV fully isolated (power and data) RS-232 transceiver

isoPower integrated, isolated dc-to-dc converter

Operational from single 3.3 V or 5 V supply

460 kbps data rate

2 × Tx and 2 × Rx channels

Meets EIA/TIA-232E specifications

ESD protection to IEC 61000-4-2 on R

INx

and T

OUTx

pins

Contact discharge: ±8 kV

Air gap discharge: ±15 kV

0.1 μF charge pump capacitors

High common-mode transient immunity: >25 kV/μs

Safety and regulatory approvals (pending)

UL recognition

2500 V rms for 1 minute per UL 1577

VDE certificate of conformity

IEC 60747-5-2 (VDE 0884, Part 2)

IORM = 560 V peak

CSA Component Acceptance Notice #5A

Operating temperature range: −40°C to +85°C

44-ball chip scale package ball grid array (CSP_BGA)

APPLICATIONS

Isolated RS-232 interface

High noise data communications

Industrial communications

Industrial/telecommunications diagnostic ports

Medical equipment

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

GENERAL DESCRIPTION

The ADM3252E is a high speed, 2.5 kV, fully isolated, dual-

channel RS-232/V.28 transceiver device that is operational from

a single 3.3 V or 5 V power supply. Because of high ESD protection

on the R

IN1

, R

IN2

, T

OUT1

, and T

OUT2

pins, the ADM3252E is ideally

suited for operation in electrically harsh environments or where

RS-232 cables are frequently plugged and unplugged.

The ADM3252E provides four independent isolation channels

using the integrated and isolated power of isoPower™. There is

no requirement to use a separate isolated dc-to-dc converter. Chip

scale transformer iCoupler® technology from Analog Devices, Inc.,

is used for both the isolation of the logic signals and the integrated

dc-to-dc converter. The result is a total isolation solution.

isoPower technology in the ADM3252E uses high frequency

switching elements to transfer power through its transformer.

Special care must be taken during printed circuit board (PCB)

layout to meet emissions standards. Refer to the AN-0971

Application Note, Recommendations for Control of Radiated

Emissions with isoPower Devices, for details on board layout

considerations.

The ADM3252E conforms to the EIA/TIA-232E and ITU-T V.28

specifications and operates at data rates of 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 or 5 V

supply. The ADM3252E is available in a 44-ball, chip scale

package ball grid array (CSP_BGA) and is specified over the

−40°C to +85°C temperature range.

RECT REG

V–

0.1µF

16V

VOLTAGE

DOUBLER

C1+ C1– V+ V

ISO

C2+ C2–

VOLTAGE

INVERTER

GND GND

ISO

ADM3252E

OSC

DECODE

OUT1

IN1

*ENCODE

IN1

OUT1

ENCODE DECODE

DECODE

OUT2

IN2

ENCODE

IN2

OUT2

ENCODE DECODE

10µ

0.1µF

10V

0.1µF

16V

0.1µF

10µ

0.1µF

16V

*INTERNAL 5kΩ PULL-DOWN RESISTOR ON THE RS-232 INPUTS.

10515-001

Summary of content (16 pages)

PAGE 1
Isolated, Dual Channel, RS-232 Line Driver/Receiver ADM3252E Data Sheet FUNCTIONAL BLOCK DIAGRAM C1 0.1µF 16V C3 0.1µF 10V C1+ C1– V+ ADM3252E 0.1µF VCC 10µF 2.5 kV fully isolated (power and data) RS-232 transceiver isoPower integrated, isolated dc-to-dc converter Operational from single 3.3 V or 5 V supply 460 kbps data rate 2 × Tx and 2 × Rx channels Meets EIA/TIA-232E specifications ESD protection to IEC 61000-4-2 on RINx and TOUTx pins Contact discharge: ±8 kV Air gap discharge: ±15 kV 0.
PAGE 2
ADM3252E Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Charge Pump Voltage Converter ............................................. 11 Applications ....................................................................................... 1 3.3 V Logic to EIA/TIA-232E Transmitter ............................. 11 Functional Block Diagram ..............................................................
PAGE 3
Data Sheet ADM3252E SPECIFICATIONS All voltages are relative to their respective grounds, all minimum/maximum specifications apply over the entire recommended operating range, TA = −40°C to +85°C, unless otherwise noted. Table 1.
PAGE 4
ADM3252E Data Sheet Parameter AC SPECIFICATIONS Output Rise/Fall Time, tR/tF (10% to 90%) Common-Mode Transient Immunity Logic High Output 2 Logic Low Output2 Refresh Rate 1 2 Min Typ Max Unit Test Conditions/Comments 2.5 ns CL = 15 pF, CMOS signal levels VCM = 1 kV, transient magnitude = 800 V VCM = 1 kV, transient magnitude = 800 V 1.0 kV/μs kV/μs Mbps 25 25 Guaranteed by design.
PAGE 5
Data Sheet ADM3252E INSULATION AND SAFETY-RELATED SPECIFICATIONS Table 4. Parameter INSULATION AND SAFETY Rated Dielectric Insulation Voltage Minimum External Air Gap (Clearance) Minimum External Tracking (Creepage) Minimum Internal Gap (Internal Clearance) Tracking Resistance (Comparative Tracking Index) Isolation Group Symbol Value Unit Test Conditions L(I01) 2500 7.6 V rms mm L(I02) 7.6 mm CTI 0.
PAGE 6
ADM3252E Data Sheet ABSOLUTE MAXIMUM RATINGS Table 5. Parameter VCC, VISO V+ V− Input Voltages TIN1, TIN2 RIN1, RIN2 Output Voltages TOUT1, TOUT2 ROUT1, ROUT2 Short-Circuit Duration TOUT1, TOUT2 Power Dissipation Operating Temperature Range Industrial Storage Temperature Pb-Free Temperature (Soldering, 30 sec) Storage Temperature Prior to Soldering Bake Temperature (If Required) Rating −0.3 V to +6 V (VCC − 0.3 V) to +13 V −13 V to +0.3 V −0.3 V to (VCC + 0.3 V) ±30 V ±15 V −0.3 V to (VCC + 0.
PAGE 7
Data Sheet ADM3252E PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 2 A NC B VCC 10 11 VCC VISO DNC VCC VISO V+ C GND GND VISO C1+ D TIN1 GND E GND GND F TIN2 GND G GND GND H ROUT1 GND GNDISO RIN1 J GND GND GNDISO V– K ROUT2 GND GNDISO RIN2 GND GNDISO DNC L NC 3 4 5 6 7 8 9 GNDISOTOUT1 ADM3252E TOP VIEW (Not to Scale) BALLS IN COLUMN 3 TO COLUMN 9 REMOVED FOR ISOLATION GNDISO C1– GNDISOTOUT2 C2– C2+ 10515-002 1 Figure 2. Pin Configuration Table 6.
PAGE 8
ADM3252E Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 30 120 25 100 VCC = 3.3V VCC = 3.3V (1nF) 80 ICC (mA) ICC (mA) 20 RL = 3kΩ 15 VCC = 5V VCC = 5V (1nF) 60 VCC = 3.3V (220pF) 40 10 VCC = 5V (220pF) –25 0 25 50 75 100 TEMPERATURE (°C) 0 10515-101 0 –50 0 100 70 8 65 6 Tx OUTPUT (V) 55 ICC (mA) 400 500 RL = 3kΩ HIGH 460kbps 4 VCC = 3.3V 50 45 300 Figure 6. Supply Current vs. Data Rate Figure 3. Supply Current vs.
PAGE 9
Data Sheet ADM3252E 4 TIN1/TIN2 (2V/DIV) 3 TOUT1/RIN1 (5V/DIV) Tx INPUT (V) RISING TOUT2/RIN2 (5V/DIV) 2 FALLING 1 3.5 4.0 4.5 5.0 5.5 6.0 VCC (V) TIME (1µs/DIV) 10515-107 0 3.0 Figure 12. 460 kbps Data Transmission, Driver Outputs Tied to Receiver Inputs Figure 9. Transmitter Input Threshold vs. VCC 3.0 2.5 NO LOAD Rx INPUT (V) 2.0 1.5 INPUT RISING FULLY LOADED RS-232 1.0 INPUT FALLING 0.5 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) Figure 10.
PAGE 10
ADM3252E Data Sheet THEORY OF OPERATION C1 0.1µF 16V C1+ C1– V+ ADM3252E 0.1µF VISO C2+ C2– VOLTAGE DOUBLER RECT OSC ROUT1 DECODE ENCODE TIN1 ENCODE DECODE ROUT2 DECODE ENCODE TIN2 ENCODE DECODE C2 0.1µF 16V C4 0.1µF 16V V– VOLTAGE INVERTER REG RIN1* R TOUT1 T RIN2* R TOUT2 T GND GNDISO 10515-003 0.1µF 10µF VCC 10µF C3 0.1µF 10V *INTERNAL 5kΩ PULL-DOWN RESISTOR ON THE RS-232 INPUTS. Figure 15.
PAGE 11
Data Sheet ADM3252E CHARGE PUMP VOLTAGE CONVERTER 3.3 V LOGIC TO EIA/TIA-232E TRANSMITTER The charge pump voltage converter consists of a 200 kHz oscillator and a switching matrix. The converter generates a ±6.6 V supply from the 3.3 V input level. This is achieved in two stages by using a switched capacitor technique, as shown in Figure 17 and Figure 18. The transmitter driver converts the 3.3 V logic input levels into RS-232 output levels. When driving an RS-232 load with VCC = 3.
PAGE 12
ADM3252E Data Sheet APPLICATIONS INFORMATION PCB LAYOUT The ADM3252E requires no external circuitry for its logic interfaces. Power supply bypassing is required at the input and output supply pins (see Figure 20). Bypass capacitors are conveniently connected between Pin B1 and Pin C1 for VCC and between Pin C10 and Pin D10 for VISO. A1 BALL CORNER 1 2 3 4 5 6 7 8 0.1µF 9 10 11 VIA TO GNDISO A 0.
PAGE 13
Data Sheet ADM3252E In the absence of logic transitions at the input for more than 1 µs, periodic sets of refresh pulses (indicative of the correct input state) are sent to ensure dc correctness at the output. If the decoder receives no internal pulses for more than approximately 5 µs, the input side is assumed to be unpowered or nonfunctional, in which case the isolator output is forced to a default state by the watchdog timer circuit.
PAGE 14
ADM3252E Data Sheet As the secondary side voltage rises to its regulation setpoint, a large inrush current transient is present at VCC. Upon reaching the regulation point, the regulation control circuit produces the regulation control signal that modulates the oscillator on the primary side. The VCC current is then reduced and it is proportional to the load current. The duration of the inrush current depends on the VISO loading conditions and on the current and voltage available at the VCC pin.
PAGE 15
Data Sheet ADM3252E PACKAGING AND ORDERING INFORMATION OUTLINE DIMENSIONS A1 BALL CORNER 12.10 12.00 SQ 11.90 A1 BALL CORNER 11 10 9 8 7 6 5 4 3 2 1 A B C D 10.00 BSC SQ E F G 1.00 H J K L TOP VIEW 1.55 1.44 1.35 1.00 REF BOTTOM VIEW DETAIL A DETAIL A 0.70 REF 1.03 0.96 0.89 0.48 NOM 0.43 MIN 0.26 REF COMPLIANT WITH JEDEC STANDARDS MO-192-ABD-1. 12-14-2010-A 0.70 COPLANARITY 0.60 0.20 0.50 BALL DIAMETER SEATING PLANE Figure 26.