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Isolated Linearized 4-Wire RTD Input

5B35

FEATURES

Single-channel signal conditioning module that Amplifies,

Protects, Filters, and Isolates Analog Input.

Isolates and protects a wide variety of four-wire RTDs.

Generates an linearized, highly accurate output of 0 to +5V.

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

terminals.

All 5B35 series modules are mix-and-match and Hot

Swappable.

FUNCTIONAL BLOCK DIAGRAM

APPLICATIONS

Industrial signal conditioning

Industrial signal isolation

Industrial signal filtering

Signal Linearization

Figure 1. 5B35 Functional Block Diagram

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 EU’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.

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.

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

5B35

GENERAL DESCRIPTION

The 5B35 is a single-channel signal conditioning module that

amplifies, filters, isolates and protects a wide variety of four-wire

RTDs. The module provides a linearized, highly accurate output

of 0 to +5V.

Accurate and Stable Performance

– The four-wire

configuration of the 5B35 supplies RTD excitation from a

precision, protected current source: two RTD wires carry the

excitation current and two wires serve as signal-input leads that

measure the voltage across the RTD. Because no excitation

current flows through the signal input leads, the length or

resistance of the leads creates little or no RTD measurement

error. A low-drift chopper-stabilized differential amplifier

allows use of very low excitation current to minimize error due

to RTD self heating. The amplifies low input offset drift of

+0.01

C and gain drift of +30ppm/

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

and output and input and 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 116dB of normal-mode

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

noise is an exceptionally low 0.3 Mv p-p in a 100 kHz

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

The 5B35 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 5B35 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 9

5B35

5B35 Models Available

Model

5B35-01

5B35-02

5B35-03

5B35-04

5B35-05

5B35-C-01

Input Range

100

Ω

Platinum,

=0.00385*

-100°C to +100°C (-148°F to +212°F)

0°C to +100°C (+32°F to +212°F)

0°C to +200°C (+32°F to +392°F)

0°C to +600°C (+32°F to +1112°F)

-100°C to +200°C (-148°F to +392°F)

Ω

Copper,

=0.004274

0°C to +120°C (10

Ω

@ 0°C) (+32°F to

+248°F)

0°C to +120°C (10

Ω

@ 25°C)(+32°F to

+248°F)

120

Ω

Nickel,

=0.00672

0°C to +300°C (+32°F to +572°F)

Output Range

0 V to +5 V

Accuracy

±0.26°C

±0.13°C

±0.26°C

±0.78°C

±0.60°C

±0.23°C

5B35-C-02

5B35-N-01

5B35-Custom

5B35-C-Custom

5B35-N-Custom

0 V to +5 V

±0.23°C

±0.40°C

* Custom Input/Output ranges are available including versions for the 100

Ω

Platinum RTD with

=0.003916. Refer to

configuration guide.

5B35 Specifications

(typical @ +25°C and V

= +5 V dc)

Description

Input Ranges

Standard Ranges

Custom Ranges

Refer to Model Table

-200°C to +850°C (100

Ω

Platinum,

= 0.00385)

-80°C to +320°C (120

Ω

Nickel,

= 0.00672)

-100°C to +260°C (10

Ω

Copper,

= 0.004274)

0 V to +5 V

Accuracy

Initial @ +25°C

Conformity Error

Input Offset vs. Temperature

Output Offset vs. Temperature

Gain vs. Temperature

Refer to Model Table

±0.05% Span

±0.01°C/°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

0.2 µV rms

Rev. 0 | Page 3 of 9

Model 5B35

Output Range (R

> 50 kΩ)

5B35

Output, 100 kHz Bandwidth

Output, 1 MHz Bandwidth

Output, 5 MHz Bandwidth

Bandwidth, -3 dB

Output Rise Time, 10% to 90% Span

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

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)

190 dB (180 dB, Model 5B35-04)

116 dB @ 60 Hz; 108 dB @ 50 Hz

Sensor Excitation Current

100

Ω

Pt, 120

Ω

0.25 mA

1.0 mA

Lead Resistance Effect

100

Ω

Pt, 120

Ω

10Ω Cu

±0.00001°C/Ω

±0.0001°C/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

±0.2°C/% 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

-40°C to +85°C

Rev. 0 | Page 4 of 9

5B35

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

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

Ω

will degrade conformity 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 5B35 is installed on a 5B Series backplane.

Specifications subject to change without notice.

Rev. 0 | Page 5 of 9

型号	5B35-05-NI	5B35-N-01-NI	5B35-03	5B35-C-01
描述	Analog Circuit	Analog Circuit	Other Modules	Other Modules
包装说明	XMA,	XMA,	MODULE	MODULE
Reach Compliance Code	compliant	compliant	not_compliant	not_compliant
模拟集成电路 - 其他类型	ANALOG CIRCUIT	ANALOG CIRCUIT	ANALOG CIRCUIT	ANALOG CIRCUIT
JESD-30 代码	R-XXMA-P15	R-XXMA-P15	R-XXMA-X	R-XXMA-X
功能数量	1	1	1	1
端子数量	15	15	22	22
最高工作温度	85 °C	85 °C	85 °C	85 °C
最低工作温度	-40 °C	-40 °C	-40 °C	-40 °C
封装主体材料	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
封装形状	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
封装形式	MICROELECTRONIC ASSEMBLY	MICROELECTRONIC ASSEMBLY	MICROELECTRONIC ASSEMBLY	MICROELECTRONIC ASSEMBLY
最大供电电压 (Vsup)	5.25 V	5.25 V	5.25 V	5.25 V
最小供电电压 (Vsup)	4.75 V	4.75 V	4.75 V	4.75 V
标称供电电压 (Vsup)	5 V	5 V	5 V	5 V
表面贴装	NO	NO	NO	NO
温度等级	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL
端子形式	PIN/PEG	PIN/PEG	UNSPECIFIED	UNSPECIFIED
端子位置	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Base Number Matches	1	1	1	1