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Isolated, Potentiometer Input

5B36

FEATURES

Amplifies, Protects, Filters, and Isolates a wide variety of

three-wire potentiometers and two-wire rheostats

(slidewires).

Generates a low-impedance output of 0 to +5V.

Module circuitry can withstand 240v rms at the input screw-

terminals.

All 5B36 series modules are mix-and-match and Hot

Swappable.

FUNCTIONAL BLOCK DIAGRAM

APPLICATIONS

Industrial signal conditioning

Industrial signal isolation

Industrial signal filtering

Figure 1. 5B36 Functional Block Diagram

PRODUCT OVERVIEW

The 5B Series represents an innovative generation of low cost,

high performance plug-in signal conditioners. Designed for

industrial applications, these modules incorporate highly

reliable transformer-based isolation and automated surface-

mount manufacturing technology. They are compact,

economical components whose performance exceeds that

available from more expensive devices. Combining 1500 V rms

continuous isolation, +0.05% calibrated accuracy, small size and

low cost, the 5B Series is an attractive alternative to expensive

signal conditioners and in-house designs

All modules are potted and identical in pin-out and size (2.27” x

2.32” x 0.595”). They can be mixed and matched, permitting

users to address their exact needs, and may be “hot swapped

without disturbing field wiring or power. The isolated input

modules provide 0 to +5V or +5V outputs and accept J, K, T, E,

R, S, N, or B type thermocouples.

These modules feature complete signal conditioning functions

including 240 V rms input protection, filtering, chopper

stabilized low drift +1 uV/oC amplification, 1500 V rms

isolation, and sensor excitation when required.

All modules feature excellent common mode rejection and

meet industrial transient surge withstand specifications.

There are also a number of backplanes and mounting sockets

which provide a complete signal conditioning solution for end

users. Each backplane incorporates screw terminals for field

wiring inputs and outputs and cold junction sensors for

thermocouple applications.

These signal conditioners are designed to provide an easy and

convenient solution to signal conditioning problems of both

designers and end users in measurement and control

applications. Typical uses include microcomputer-based

measurement systems, standard data acquisition systems,

programmable controllers, analog recorders and dedicated

control systems. The 5 B series modules are ideally suited to

applications where monitoring and control of temperature,

pressure, flow, rotation and other analog signals are required.

The 5B Series modules and backplanes are approved by Factory

Mutual (FM) and the 5B Series modules are approved by the

Canadian Standards Association (CSA) for use in Class 1,

Division 2, Groups A, B, C, and D locations. These approvals

certify that the 5B Series is suitable for use in locations where a

hazardous concentration of flammable gas may exist only under

fault conditions of operation. Equipment of this category is

called “nonincendive” and they need no special enclosures or

other physical safeguards.

The 5B series modules and backplanes have been tested and

passed the stringent heavy industrial requirements of the

European Union’s electromagnetic compatibility (ENC)

directive – EN50082-1 and EN50081-2. When used according

to installation directions (refer to 5B series User Manual), any

errors caused by EMI/RFI interference will be less than 0.1% of

the full scale 5B measurement range for field strengths up to 10

V/M and frequencies up to 1 GHz.

Rev. 0

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 companies.

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

www.analog.com

Tel: 781.329.4700

Fax: 781.326.8703

5B36

GENERAL DESCRIPTION

The 5B36 is a single-channel signal conditioning module that

amplifies, isolates, filters, buffers a wide variety of three-wire

potentiometers and two-wire rheostats (slidewires). The module

provides an accurately scaled, low-noise low-impedance output

of 0 to +5V.

Accurate and Stable Performance

– The 5B36 supplies

protected potentiometer / slidewire excitation from a pair of

closely matched precision current sources designed to cancel

errors due to lead resistances. A low-drift chopper-stabilized

differential amplifier allows use of a very low excitation current

to minimize error due to potentiometer self-heating. The

amplifiers low input offset drift (+0.004

Ω

C) and gain drift of

30 ppm/

C assure accuracy over the full operating temperature

range.

True Three-Port Isolation

– The floating, differential input

circuit on the field side eliminates the need for any input

grounding. Signal and power isolation by transformer coupling

uses a proprietary modulation technique for linear, stable and

reliable performance. A demodulator on the computer side of

the signal transformer recovers the original signal, which is then

filtered and buffered to provide a low-noise, low-impedance

output signal. True three-port isolation (Input-Output-Power)

includes common-mode rating of : 1500V rms between input-

output and input-power; 250V rms between power and output

– no return path is required between the power and signal

output commons.

Filtering and Protection

– An optimized five-pole Butterworth

filter (with a 4-Hz bandwidth) provides 116 dB of normal-mode

rejection (noise on signal) at 60 Hz and 108 dB at 50. Output

noise is an exceptionally low 0.3 mV pk-pk in a 100 kHz

bandwidth and 6 mV pk-pk in a 5 MHz bandwidth.

The 5B36 protects the computer side from damage due to field-

side over-voltage faults. The module withstands 240V rms at the

input terminals without damage, thereby shielding the internal

computer-side circuitry from field-side over-voltage conditions.

In addition, the 5B36 is mix-and-match and hot swappable with

all other 5B Series modules, so can be inserted or removed from

any socket in the same backplane without disrupting system

power.

A series output switch eliminates the need for external

multiplexing in many applications. The switch is turned on by

an active-low enable input. If the switch is to be on at all times,

the enable-input should be grounded to power common as it is

on the 5B01 and 5B08 backplanes..

Figure 2

Rev. 0 | Page 2 of 8

5B36

5B36 Models Available

Model

5B36-01

5B36-02

5B36-03

5B36-04

5B36-Custom

Input Range

Ω

to 100

Ω

to 500

Ω

to 1 kΩ

Ω

to 10 kΩ

Output Range

0 V to +5 V

* Custom Input/Output ranges are available. Refer to configuration guide.

5B36 Specifications

(typical @ +25°C and V

= +5 V dc)

Description

Input Ranges

Standard Ranges

Custom Ranges

Output Range (R

> 50 kΩ)

Accuracy

Initial @ +25°C

Input Offset vs. Temperature

100

Ω,

500

Ω,

1 kΩ Sensors

10 kΩ Sensor

Output Offset vs. Temperature

Gain vs. Temperature

±0.004

Ω

/°C

±0.01

Ω

/°C

±20 µV/°C

±0.003% of Reading/°C

Input Resistance

Power On

Power Off

Overload

> 1000 MΩ

200 kΩ

Noise

Input, 0.1 Hz to 10 Hz Bandwidth

Output, 100 kHz Bandwidth

Output, 1 MHz Bandwidth

Output, 5 MHz Bandwidth

Bandwidth, -3 dB

Output Rise Time, 10% to 90% Span

0.2 µV rms

100 µV rms (0.3 mV peak-peak)

1.5 mV peak-peak

6 mV peak-peak

4 Hz

100 ms

Common-Mode Voltage (CMV)

Input-to-Output, Continuous

1500 V rms, maximum

±0.08% Span

Ω

to 10 kΩ (Refer to Model Table)

Ω

to 10 kΩ (Refer to Ordering Section)

0 V to +5 V

Model 5B36

Rev. 0 | Page 3 of 8

5B36

Input-to-Power, Continuous

Output-to-Power, Continuous

Transient

1500 V rms, maximum

250 V rms, maximum

ANSI/IEEE C37.90.1-1989

Common Mode Rejection (CMR)

1 kΩ Source Imbalance, 50/60 Hz

Normal Mode Rejection (NMR)

170 dB

116 dB @ 60 Hz; 108 dB @ 50 Hz

Sensor Excitation Current

100

Ω,

500

Ω,

1 kΩ Sensors

10 kΩ Sensor

0.25 mA

0.1 mA

Lead Resistance Effect

100

Ω,

500

Ω,

1 kΩ Sensors

10 kΩ Sensor

±0.005

Ω

/Ω

±0.01

Ω

/Ω

Input Protection

Continuous

Transient

Output Resistance

Voltage Output Protection

Output Current Limit

Output Selection Time

240 V rms, maximum

ANSI/IEEE C37.90.1-1989

Ω

Continuous Short to Ground

±9 mA

6 µs to ±1 mV of V

out

@ C

load

= 0 to 2,000 pF

Output Enable Control

Max Logic "0"

Min Logic "1"

Max Logic "1"

Input Current "0", "1"

Power Supply Voltage

Power Supply Current

Power Supply Sensitivity, RTI

Mechanical Dimensions

+0.8 V

+2.4 V

+100 V

0.5 µA

+5 V dc ±5%

15 mA

±2 µV/% of V

2.275" x 2.375" x 0.595"

(57.8 mm x 59.1 mm x 15.1 mm)

Environmental

Temperature Range

Rated Performance

Operating

Storage

Relative Humidity

RFI Susceptibility

-40°C to +85°C

0 to 93% @ +40°C non-condensing

±0.5% Span error @ 400 MHz, 5 Watt, 3 ft

* ±0.025

Ω

For Cu RTD's; ±0.1

Ω

For Ni RTD's.

Includes the combined effects of repeatability, hysteresis, and nonlinearity error. Loads heavier than 50 k

Ω

will degrade nonlinearity and gain temperature coefficient.

The user's board layout must separate Power Common from Output Common. When the output switch is not used, connect the Enable Input to the Output Common. Output

Common is connected to power common when the 5B36 is installed on a 5B Series backplane.

Specifications subject to change without notice.

Rev. 0 | Page 4 of 8

5B36

PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS

Figure 3 5B36 Input Field Connections

Table 1. Pin Function Descriptions—

Pin No.

Description

n/c

HIGH

EXC +

Figure 4 . Model 5B Series Module, with pin-out assignments.

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human

body and test equipment and can discharge without detection. Although this product features proprietary ESD

protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges.

Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

Rev. 0 | Page 5 of 8