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5B35:  Isolated 4 Wire RTD Input Signal Conditioning Module

Product Details


Model 5B35 converts the input from a wide variety of RTD types to a linearized, high accuracy output of 0 V to +5 V. The module provides transformer isolation, RTD excitation, RTD lead-resistance compensation, signal filtering and input protection against line voltage connection. A series output switch eliminates the need for external multiplexing. The industry standard 5B Series encapsulated plug-in modular package is compatible with all 5B backplanes. Modules are powered by +5 V dc, ±5%.

Signal isolation is provided by transformer coupling using a proprietary technique for linear, stable performance. A demodulator on the output side of the signal transformer recovers the input signal, which is filtered and buffered to provide an accurate, low impedance, low noise output.

True three-port isolation includes common-mode voltage of: 1500 V rms between input and output, and between input and power; 250 V rms between output and power.

The modules provide RTD excitation from a precision current source. A low drift, chopper stabilized, differential amplifier design allows for the use of very low RTD excitation currents to minimize accuracy losses from self-heating of the RTD. The low input offset drift of ±0.01°C/°C and gain drift of ±30 ppm/°C assure that accuracy is maintained over a wide operating temperature range.

The four-wire configuration of the 5B35 supplies the RTD excitation current through two leads that are not the signal input leads. Because there is no excitation current in the signal input leads, the lead lengths or resistances have no effect on the RTD measurement.

An optimized five-pole Butterworth filter (with 4 Hz bandwidth) provides 116 dB of normal-mode rejection at 60 Hz and 108 dB at 50 Hz. Output noise is an exceptionally low 0.3 mV p-p at 100 kHz bandwidth and 6 mV p-p at 5 MHz bandwidth.

The input circuit is protected against accidental application of voltages, such as an ac power line, up to 240 V rms continuous.

A series output switch is included to eliminate the need for external multiplexing in many applications. This switch has a low output resistance and is controlled by an active-low enable input. When the output switch is not used, ground the enable input to I/O common to turn on the switch.

FEATURES and BENEFITS

  • Accepts RTD Inputs (4wr)
  • Sensor Excitationand Lead Compensation
  • Linearized Output vs. Sensor Temperature
  • 0-5V Output
  • 4 Hz BW

Functional Block Diagram for 5B35

Documentation

Title Content Type File Type
5B35: Isolated Linearized 4-Wire RTD Input Data Sheet (Rev 0, 01/1999) (pdf, 691 kB) Data Sheets PDF
AN-529: 5B Series Signal Conditioning Subsystems in RFI/EMI Fields  (pdf, 24 kB) Application Notes PDF
AN-535: Digital Input/Output Subsystems  (pdf, 336 kB) Application Notes PDF
AN-533: Applying 5B Series Backplanes and Mounting Cards  (pdf, 145 kB) Application Notes PDF
AN-530: Narrow or Wide Bandwidth 5B Series Input Modules: Which is the Right Choice?  (pdf, 18 kB) Application Notes PDF
AN-528: Design Considerations for Designing a 5B Series System  (pdf, 16 kB) Application Notes PDF
5B Series Manual  (pdf, 2274 kB) User Guides PDF
Make vs. Buy! When Should I Reinvent the Wheel?
(Analog Dialogue, Vol. 33, No. 10, November-December, 1999)
Analog Dialogue HTML
5B Series Backplanes and Mounting Cards Backplanes HTML
5B Series Custom Configuration Ranges Configuration Guides HTML
5B Series Configuration Guide Configuration Guides HTML
IOS Custom Product Worksheet
As a Design Subcontractor, IOS believes it essential to engage with our customers early in the development cycle. Complete the form and it will be reviewed and you will be contacted by one of our design specialists.
Custom Product Worksheet HTML
5B Series Accessories Accessories HTML
5B Series Power Supplies Power Supplies HTML
Selecting the Right Signal Conditioning Series for Your Application Overview HTML
All Series Modules Overview HTML
IOS 3 Year Warranty  (pdf, 23 kB) Overview PDF
5B Series Overviews Overview HTML
IOS Short Form Brochure  (pdf, 2298 kB) Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
5B I/O Subsystem Software Tools
  • 5BCUSTOM.ZIP  (zip, 2111 kB)
    5B Custom Program for Windows 3.1. 5B Custom program assists users of 5B Series of signal conditioners in selecting Custom-Ranged 5B Modules. The program also lists general 5B information, ranges, application notes, etc... [D/L Time 22.5 min @ 14.4Kbps]. 2162562 01-22-96
  • 5BNOISE.TXT
    Steps on how to deal with noise with the 5B modules. 4096 10-27-93 (txt, 4,096 bytes)
  • SENSORS.ZIP
    Windows Conversion Utility Program for common temperature sensing devices. Sensors (Ver 1.2) Dated: Feb 15, 1994. 351525 08-24-95 (zip, 351,525 bytes)
  • TC_CONV.TXT
    Simple steps explaining Temperature Conversion for our Thermocouple Modules (3B, 5B, 7B). 1920 07-09-93 (txt, 2,136 bytes)
I/O Subsystem Software Tools HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

5B35 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
5B35-01 Status: Production IOS MODULE 14 Comm. Tray, 1 - N  Material Info Notify Me Purchase
5B35-02 Status: Production IOS MODULE 14 Comm. Tray, 1 - N  Material Info Notify Me Purchase
5B35-03 Status: Production IOS MODULE 14 Comm. Tray, 1 - N  Material Info Notify Me Purchase
5B35-04 Status: Production IOS MODULE 1414 Comm. Tray, 1 - N  Material Info Notify Me Purchase
5B35-05 Status: Production IOS MODULE 14 Comm. Tray, 1 - N  Material Info Notify Me Purchase
5B35-C-01 Status: Production IOS MODULE 14 Comm. Tray, 1 - N  Material Info Notify Me Purchase
5B35-C-02 Status: Last Time Buy IOS MODULE 14 Comm. Tray, 1 - N  Material Info PDN Purchase
5B35-C-CUSTOM Status: Last Time Buy IOS MODULE 14 Comm. Tray, 1 - N  Material Info PDN Contact ADI
5B35-CUSTOM Status: Production IOS MODULE 14 Comm. Tray, 1 - N  Material Info Notify Me Contact ADI
5B35-N-01 Status: Last Time Buy IOS MODULE 14 Comm. Tray, 1 - N  Material Info PDN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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