1B21AN Analog Devices Inc, 1B21AN Datasheet

1B21AN

Manufacturer Part Number

1B21AN

Description

IC CONV V TO I HYBRID 38-DIP

Manufacturer

Analog Devices Inc

Type

Voltage and Current Controllerr

Datasheet

1.1B21AN.pdf (8 pages)

Specifications of 1B21AN

Rohs Status

RoHS non-compliant

Full Scale

±50ppm/°C

Linearity

±0.02%

Mounting Type

Through Hole

Package / Case

38-DIP (0.500", 12.70mm), 8 Leads

Ic Function

Voltage To Current Converter IC

Supply Voltage Range

14.25V To 15.75V

Operating Temperature Range

-40Â°C To +85Â°C

Digital Ic Case Style

DIP

No. Of Pins

Lead Free Status / Rohs Status

Not Compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

BOSTOCK HK LIMITED

Part Number:

1B21AN

Quantity:

1 603

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Load resistance range: 0 to 1.35 kΩ maximum

Small package: 0.7” × 2.1” × 0.35”

Meets IEEE Standard 472: transient protection (SWC)

FEATURES

Wide input range: 0 V to 1 V up to 0 V to 10 V

High CMV isolation: 1500 V rms

Programmable output ranges: 4mA to 20mA

High accuracy

APPLICATIONS

Multichannel process control

DAC—current loop interface

Analog transmitters and controllers

Remote data acquisition systems

GENERAL DESCRIPTION

The 1B21 is an isolated voltage-to-current converter that

incorporates a unique circuit design utilizing transformer-based

isolation and automated surface-mount manufacturing technology.

It provides an unbeatable combination of versatility and perfor-

mance in a compact plastic package. Designed for industrial

applications, it is especially suited for harsh environments with

extremely high common-mode interference.

Functionally, the V/I converter consists of four basic sections:

input conditioning, modulator, demodulator and current source

(see Figure 1). The input is a resistor-programmable gain stage

that accepts a 0 V to 1 V up to 0 V to 10 V voltage input. This

maps into a 0 mA to 20 mA output or can be offset by 20%

using the internal reference for 4 mA to 20 mA operation. The

high level signal is modulated and passed across the barrier

which provides complete input to output galvanic isolation of

1500 V rms continuous by the use of transformer-coupling

techniques. Nonlinearity is an excellent ±0.05% maximum.

Designed for multichannel applications, the 1B21 requires an

external loop supply and can accept up to 30 V maximum. This

Rev. C

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.

Trademarks and registered trademarks are the property of their respective owners.

0 to 20 mA

Low offset tempco: ±300 nA/°C

Low gain tempco: ±50 ppm/°C

Low nonlinearity: ±0.02%

High CMR: 90 dB minimum

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

provides a loop supply compliance of 27V, which is sufficient to

drive a 1.35 kΩ load resistance.

The 1B21 is fully specified over −25°C to +85°C and operates

over the industrial (−40°C to +85°C) temperature range.

DESIGN FEATURES AND USER BENEFITS

High CMV Isolation. The 1B21 features high input to output

galvanic isolation to eliminate ground loops and offer protection

against damage from transients and fault voltages. The isolation

barrier will withstand continuous CMV of 1500V rms and

meets the IEEE Standard for Transient Voltage Protection

(Std. 472-SWC).

Small Size. The 1B21 package size (0.7” × 2.1” DIP) makes it an

excellent choice in multichannel systems for maximum channel

density. The 0.35” height also facilitates applications with

limited board clearance.

Ease of Use. Complete isolated voltage-to-current conversion

with minimum external parts required to get a conditioned

current signal. No external buffers or drivers are required.

INPUT

Voltage-to-Current Converter

+15V

–15V

COM

OUT

REF

FUNCTIONAL BLOCK DIAGRAM

Isolated, Loop-Powered

TIMING

MODULATOR

OSCILLATOR

Figure 1.

ISOLATION

SIGNAL

POWER

DEMODULATOR

RECTIFIER

TIMING

www.analog.com

1B21

OUT

HIGH

OUT

LOW

Related parts for 1B21AN

1B21AN Summary of contents

Page 1

FEATURES Wide input range High CMV isolation: 1500 V rms Programmable output ranges: 4mA to 20mA Load resistance range 1.35 kΩ maximum ...

TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Design Features and User Benefits ................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Pin Configuration ............................................................................. 4 REVISION HISTORY 12/09—Rev. ...

Page 3

SPECIFICATIONS Typical at +25°C and V = ±15 V, unless otherwise noted. S Table 1. Parameter INPUT SPECIFICATIONS Input Range Full-Scale Input Input Bias Current OUTPUT SPECIFICATIONS Current Output Range Load Compliance LOOP Max Output ...

Page 4

PIN CONFIGURATION 1B21 BOTTOM VIEW Figure 2. Pin Configuration Rev Page ...

Page 5

INSIDE THE 1B21 Referring to the functional block diagram (see Figure 3), the ±15 V power inputs provide power to both the input side circuitry and the power oscillator. The 25 kHz power oscillator provides both the timing information for ...

Page 6

TC Considerations of External Resistors The specifications for gain and offset temperature coefficient (TC) for the IB21 excluded the effects of external components. The total gain TC for the circuit in Figure 4 is Gain TC = 1B21 Gain ...

Page 7

APPLICATIONS INFORMATION OUTPUT PROTECTION In many industrial applications, it may be necessary to protect the current output from accidental shorts to ac line voltages in addition to high common-mode voltages and short circuits to ground. The circuit show in Figure ...

Page 8

... PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. ORDERING GUIDE Model Temperature Range 1B21AN −25°C to +85°C ©1991–2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 2.10 (53.34) MAX SIDE VIEW 0 ...

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