1B22 Analog Devices, 1B22 Datasheet

1B22

Manufacturer Part Number

1B22

Description

Programmable/ Isolated Voltage-to-Current Converter

Manufacturer

Analog Devices

Datasheets

1.1B22.pdf (4 pages)

2.1B22.pdf (4 pages)

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REV. B

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

GENERAL DESCRIPTION

The 1B22 is an isolated voltage-to-current converter that

incorporates transformer isolation to achieve high performance

and automated surface mount manufacturing for low cost

and increased reliability. Designed for industrial applications,

it is especially suited for harsh environments with extremely

high common-mode interference. With programmable inputs

and outputs, the 1B22 provides an unbeatable combination of

versatility and performance in a compact plastic package.

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

input conditioning, modulator/demodulator, isolated loop

supply and current source (Figure 1). The 1B22 is pin program-

mable for 0 V to +5 V or 0 V to +10 V inputs and 0 to 20 mA

or 4 to 20 mA outputs using an internal resistor network. It can

also be set by an external resistor to accept 0 V to +1 V to 0 V

to +10 V inputs. Transformer coupling provides 1500 V rms

galvanic isolation between the inputs and the current loop.

Nonlinearity is an excellent ± 0.05% max.

Loop power is generated internally through a dc/dc converter

and is also isolated from the input side (1500 V rms). Loop

compliance voltage is dependent on the voltage supplied to the

1B22, and with V

load.

The 1B22 is fully specified over –25°C to +85°C and operates

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

FEATURES

Internal Isolated Loop Supply Drives 1000

Pin Programmable Inputs: 0 V to +5 V or 0 V to +10 V

Pin Programmable Outputs: 4 to 20 mA or 0 to 20 mA

High CMV Isolation: 1500 V RMS

Normal-Mode Output Protection: 240 V RMS

High Accuracy

Small Package: 1.0"

Meets IEEE STD 472: CMV Transient Protection (SWC)

APPLICATIONS

Multichannel Process Control

D/A Converter—Current Loop Interface

Analog Transmitters and Controllers

Remote Data Acquisition Systems

Low Offset Tempco:

Low Gain Tempco:

Low Nonlinearity:

High CMR: 90 dB min

LOOP

= 28 V, it is sufficient to drive a 1000 Ω

0.02%

2.10"

50 ppm/ C

300 nA/ C

0.35"

Load

DESIGN FEATURES AND USER BENEFITS

Isolated Loop Power: Internal loop supply completely

isolates the loop from the input terminals (1500 V rms) and

provides the capability to drive 0 Ω to 1000 Ω loads. This elimi-

nates the need for an external dc/dc converter.

Ease of Use: The 1B22 offers complete isolated voltage-to-

current conversion with minimum external parts required to get

a conditioned current signal. No external buffers or drivers are

required.

High CMV Isolation: The 1B22 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 1500 V rms and meets

the IEEE Standard for Common-Mode Voltage Transient Pro-

tection (STD 472-SWC).

Small Size: The 1B22 package size (1.0" × 2.1" DIP) makes it

an excellent choice in multichannel systems for maximum chan-

nel density. The 0.35" height also facilitates applications with

limited board clearance.

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

Tel: 781/329-4700

Fax: 781/326-8703

S. NODE

OFFSET

A. COM

SYNC

+15V

–15V

4mA

Voltage-to-Current Converter

IN2

IN1

RESISTOR

NETWORK

FUNCTIONAL BLOCK DIAGRAM

Programmable, Isolated

World Wide Web Site: http://www.analog.com

P. COM

OSCILLATOR

MODULATOR

REF

LOOP

ISOLATION

POWER

SIGNAL

DEMODULATOR

LOOP SUPPLY

RECTIFIER/

1B22

PROT

OUT

Related parts for 1B22

1B22 Summary of contents

Page 1

... CMV of 1500 V rms and meets the IEEE Standard for Common-Mode Voltage Transient Pro- tection (STD 472-SWC). Small Size: The 1B22 package size (1.0" × 2.1" DIP) makes it an excellent choice in multichannel systems for maximum chan- nel density. The 0.35" height also facilitates applications with limited board clearance ...

Page 2

... Relative Humidity, Noncondensing CASE SIZE Specifications subject to change without notice. (typical @ +25 C and +24 V, unless otherwise noted) S LOOP 1B22AN + kΩ 25 kΩ mA min 20 V min 30 mA 300 nA p-p ± 0.02% (± 0.05% max) ...

Page 3

... INSIDE THE 1B22 The 1B22 produces an isolated out- put current which is proportional to the input voltage and independent of the output load resistance (Figure 1). The input stage is configured as an inverting amplifier with a resistor net- work to provide pin-strappable input ranges and +10 V and output ranges and ...

Page 4

... DACPORT®, should be connected for operation on the unipo- lar +10 V output range. This is shown in Figure 7. Figure 7. D/A Converter–Isolated 4-20 mA Interface Pressure Transmitter: In Figure 8, the 1B22 is used in a pressure transmitter application to provide complete input- output isolation and avoid signal errors due to ground loop cur- rents. The process pressure is monitored with a strain gage type pressure transducer interfaced by the Analog Devices’ ...

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