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PDF ADM3252E Data sheet ( Hoja de datos )
| Número de pieza | ADM3252E | |
| Descripción | RS-232 Line Driver/Receiver | |
| Fabricantes | Analog Devices | |
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Data Sheet
Isolated, Dual Channel, RS-232 Line
Driver/Receiver
ADM3252E
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 RINx and TOUTx 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)
VIORM = 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
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 RIN1, RIN2, TOUT1, and TOUT2 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.
FUNCTIONAL BLOCK DIAGRAM
C1
0.1µF
16V
C3
0.1µF
10V
10µF
0.1µF
C2
0.1µF
16V
C4
0.1µF
16V
ADM3252E
VCC
ROUT1
TIN1
ROUT2
TIN2
OSC
DECODE
ENCODE
DECODE
ENCODE
C1+ C1– V+ VISO
VOLTAGE
DOUBLER
C2+ C2– V–
VOLTAGE
INVERTER
RECT REG
ENCODE
DECODE
ENCODE
DECODE
R RIN1*
T TOUT1
R RIN2*
T TOUT2
GND
GNDISO
*INTERNAL 5kΩ PULL-DOWN RESISTOR ON THE RS-232 INPUTS.
Figure 1.
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.
Rev. A
Document Feedback
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2012–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADM3252E
Data Sheet
Parameter
Min Typ Max Unit Test Conditions/Comments
AC SPECIFICATIONS
Output Rise/Fall Time, tR/tF (10% to 90%)
2.5
ns CL = 15 pF, CMOS signal levels
Common-Mode Transient Immunity
Logic High Output2
25
kV/μs VCM = 1 kV, transient magnitude = 800 V
Logic Low Output2
25
kV/μs VCM = 1 kV, transient magnitude = 800 V
Refresh Rate
1.0 Mbps
1 Guaranteed by design.
2 VCM is the maximum common-mode voltage slew rate that can be sustained while maintaining specification compliant operation. VCM is the common-mode potential
difference between the logic and bus sides. The transient magnitude is the range over which the common-mode voltage is slewed. The common-mode voltage slew
rates apply to both rising and falling common-mode edges.
PACKAGE CHARACTERISTICS
Table 2.
Parameter
PACKAGE CHARACTERISTICS
Resistance (Input-to-Output)
Capacitance (Input-to-Output)
Input Capacitance
IC Junction-to-Air Thermal Resistance
Symbol
RI-O
CI-O
CI
θJA
Min Typ Max Unit Test Conditions/Comments
1012 Ω
2.2 pF f = 1 MHz
4.0 pF
40 °C/W
REGULATORY INFORMATION (PENDING)
Table 3.
UL
Recognized Under UL 1577
Component Recognition
Program1
Single Protection, 2500 V rms
Isolation Voltage
CSA
Approved under CSA Component Acceptance
Notice #5A
Testing was conducted per CSA 60950-1-07 and
IEC 60950-1 2nd ed. at 2.5 kV rated voltage
Basic insulation at 400 V rms (565 V peak)
working voltage
VDE
Certified according to IEC 60747-5-2 (VDE 0884
Part 2):2003-012
Basic insulation, 560 V peak
1 In accordance with UL 1577, each ADM3252E is proof tested by applying an insulation test voltage ≥ 3000 V rms for 1 second (current leakage detection limit = 15 µA).
2 In accordance with IEC 60747-5-2 (VDE 0884 Part 2):2003-01, each ADM3252E is proof tested by applying an insulation test voltage ≥ 1050 V peak for 1 second (partial
discharge detection limit = 5 pC). The asterisk (*) marking branded on the component designates IEC 60747-5-2 (VDE 0884 Part 2):2003-01 approval.
Rev. A | Page 4 of 16
5 Page 
ADM3252E
Data Sheet
THEORY OF OPERATION
C1
0.1µF
16V
C3
0.1µF
10V
10µF
0.1µF
C2
0.1µF
16V
C4
0.1µF
16V
ADM3252E
VCC
OSC
C1+ C1– V+ VISO
VOLTAGE
DOUBLER
C2+ C2– V–
VOLTAGE
INVERTER
RECT REG
ROUT1
TIN1
ROUT2
TIN2
DECODE
ENCODE
DECODE
ENCODE
ENCODE
DECODE
ENCODE
DECODE
R RIN1*
T TOUT1
R RIN2*
T TOUT2
GND
GNDISO
*INTERNAL 5kΩ PULL-DOWN RESISTOR ON THE RS-232 INPUTS.
Figure 15. Functional Block Diagram
The ADM3252E is a high speed, 2.5 kV, fully isolated, dual-
channel RS-232 transceiver device that operates from a single
power supply.
The internal circuitry consists of the following main sections:
Isolation of power and data
Charge pump voltage converter
3.3 V logic to EIA/TIA-232E transmitter
EIA/TIA-232E to 3.3 V logic receiver
ISOLATION OF POWER AND DATA
The ADM3252E incorporates a dc-to-dc converter section,
which works on principles that are common to most power
supply designs. VCC power is supplied to an oscillating circuit
that switches current into a chip scale air core transformer. Power
is transferred to the secondary side where it is rectified to a high
dc voltage. The power is then linearly regulated to 3.3 V and
supplied to the secondary side data section and to the VISO pin.
Because the oscillator runs at a constant high frequency
independent of the load, excess power is internally dissipated
in the output voltage regulation process. Limited space for
transformer coils and components adds to the internal power
dissipation. This results in low power conversion efficiency.
The transmitter input (TINx) accepts TTL/CMOS input levels.
The driver input signal that is applied to the TINx pins is
referenced to logic ground (GND). It is coupled across the
isolation barrier, inverted, and then appears at the transceiver
section, referenced to isolated ground (GNDISO).
Similarly, the receiver input (RINx) accepts RS-232 signal levels
referenced to isolated ground (GNDISO). The RINx input is
inverted and coupled across the isolation barrier to appear at
the ROUTx pin, referenced to logic ground (GND).
The digital signals are transmitted across the isolation barrier
using iCoupler technology. Chip scale transformer windings
couple the digital signals magnetically from one side of the
barrier to the other. Digital inputs are encoded into waveforms
that are capable of exciting the primary transformer of the winding.
At the secondary winding, the induced waveforms are decoded
into the binary value that was originally transmitted.
3.0V TO 5.5V
10µF
0.1µF
VCC
VISO
ADM3252E V+
C3
+ 0.1µF
10V
0.1µF
10µF
CMOS OUTPUT
CMOS OUTPUT
CMOS INPUT
CMOS INPUT
ROUT1
ROUT2
TIN1
TIN2
C1+
C1–
TOUT1
TOUT2
RIN1
RIN2
+
C1
0.1µF
16V
EIA/TIA-232E OUTPUT
EIA/TIA-232E OUTPUT
EIA/TIA-232E INPUT
EIA/TIA-232E INPUT
GND
ISOLATION
BARRIER
C2+
C2–
V–
GNDISO
+
C2
0.1µF
16V
C4
+ 0.1µF
16V
Figure 16. Typical Operating Circuit
Rev. A | Page 10 of 16
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet ADM3252E.PDF ] | |
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