7B31

7B31 Isolated Voltage Input Data Sheet (REV. 0)

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Technical content

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 ri ghts of Analog Devices. Trademarks and registered trademarks are the property of their respective companies. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.

FEATURES

Interfaces, amplifies, and filters unipolar and bipolar voltage inputs. Module provides a precision output of either +1 V to +5 V or 0 V to +10 V, linear with temperature. Rated to operate with a nominal +24 VDC supply. All 7B31 series modules are mix-and-match and Hot Swappable.

APPLICATIONS

Industrial signal conditioning Industrial signal isolation Industrial signal filtering PRODUCT OVERVIEW The 7B Series of signal conditioners feature small size, low cost and a wide output voltage range for a variety of applications including process control and factory-floor environments. The single-channel 7B modules accept inputs from a range of transducers and are fully rated over the extended -40 oC to +85oC industrial temperature range. All 7B Series modules are rated for a nominal power supply input of +24 VDC; and, for maximum flexibility, they will accept supply voltages in the +14 VDC to +35 VDC range. The input modules, with the exception of the 7B21, provide a high-level output voltage that is factory configured for either the +1 V to +5 V or 0 V to +10 V range. The 7B21 is a unity gain, isolated input module with an input/output range of +10V . Output modules are available that provide either isolated process current or isolated bipolar voltage output. Model 7B39 converts either a +1 V to +5 V input to a 4 to 20 mA output or a 0 V to +10 V input to a 0-20 mA output. The input/output ranges of the 7B39 are factory configured. The 7B22 is a unity gain module that provides an isolated +10V output signal. All modules have a universal pin- out and may be readily hot-swapped under full power without disrupting field wiring. Each module accepts analog transducer signals and transfers them to a process control or factory data collection system without the inherent noise, non-linearity, drift and extraneous voltages which frequently accompany the signals. FUNCTIONAL BLOCK DIAGRAM Figure 1. 7B31 Functional Block Diagram isolation of the input signals. reliability of each module’s electrical connection.

Rev. 0 | Page 2 of 8 GENERAL DESCRIPTION The 7B31 is a single-channel signal conditioning module that interfaces, amplifies and filters unipolar and bipolar voltage inputs and provides a protected precision output of either +1 V to +5 V or 0 V to +10 V . Model 7B31 features a nonlinearity of +0.02% maximum and an accuracy of +0.1% maximum (+0.01% typical). To accurately measure low level signals in electrically noisy environments, 1500 V rms of galvanic transformer-based isolation with a common mode rejection (CMR) of 120 dB @ 50/60 Hz and a normal mode rejection (NMR) of 60 dB @ 50/60 Hz are provided. Rated to operate with a nominal +24 VDC supply, Model 7B31 is mix-and-match and hot-swappable with other 7B Series input modules, so it can be inserted or removed from any socket in the same backplane without disturbing system power. The floating differential input of Model 7B31 is fully protected up to 120 V rms line voltage. A one-pole 3 Hz filter preconditions the input signal prior to amplification by a low drift input (1500 V rms input-to-output and power). Isolated front-end circuitry power is supplied by a DC/DC converter. The output section contains a two-pole low pass filter (-3 dB @ 3 Hz), a buffer amplifier and a power oscillator. The two-pole output filter and subsequent buffer ensures that a low noise, low impedance (<1Ω) signal is available at the output to drive loads of 2 kΩ minimum. Figure 2

Rev. 0 | Page 3 of 8 7B31 Models Available Model Input Range Output Range 7B31-01-1 0 V to +10 V +1 V to +5 V 7B31-01-2 0 V to +10 V 0 V to +10 V 7B31-02-1 -5 V to +5 V +1 V to +5 V 7B31-02-2 -5 V to +5 V 0 V to +10 V 7B31-03-1 -10 V to +10 V +1 V to +5 V 7B31-03-2 -10 V to +10 V 0 V to +10 V 7B31-04-1 0 V to +5 V +1 V to +5 V 7B31-04-2 0 V to +5 V 0 V to +10 V 7B31-05-1 0 V to +20 V +1 V to +5 V 7B31-05-2 0 V to +20 V 0 V to +10 V 7B31-06-1 -20 V to +20 V +1 V to +5 V 7B31-06-2 -20 V to +20 V 0 V to +10 V 7B31-07-1 0 V to +50 V +1 V to +5 V 7B31-07-2 0 V to +50 V 0 V to +10 V 7B31-08-1 -50 V to +50 V +1 V to +5 V 7B31-08-2 -50 V to +50 V 0 V to +10 V 7B31 Specifications (typical @ +23°C ±5°C and Vs = +24 V dc) Description Model 7B31 Input Ranges (Refer to Model Table) Standard Unipolar Ranges 0 V to: +5 V or +10 V or +20 V or +50 V Standard Bipolar Ranges ±5 V or ±10 V or ±20 V or ±50 V Custom Ranges Not Available* Output Range Options (R L > 2 kΩ) +1 V to +5 V or 0 V to +10 V Accuracy1 Initial @ +25°C ±0.01% Span (±0.1% Span, maximum) Nonlinearity2 ±0.02% Span, maximum Input Offset vs. Temperature ±0.5µV/°C Zero Suppression vs. Temperature ±0.005% (V z)3/°C Span vs. Temperature ±35 ppm/°C Output Offset vs. Temperature ±0.002% span/°C Input Resistance Power ON 7B31-01 to 7B31-04 100 kΩ

Rev. 0 | Page 4 of 8 7B31-05 to 7B31-08 1 MΩ Power OFF 30 kΩ, minimum Output Noise

5 MHz Bandwidth 6 mV peak

10 Hz to 100 kHz Bandwidth 0.4 mV rms

0.1 Hz to 10 Hz Bandwidth 3 µV peak

Bandwidth, -3 dB 3 Hz Output Rise Time, 10% to 90% Span 150 ms Common-Mode Voltage (CMV) Input-to-Output and Power 1500 V rms continuous Common Mode Rejection (CMR) Input-to-Output and Power @ 50/60 Hz 120 dB Normal Mode Rejection @ 50/60 Hz 120 dB Input Protection 120 V rms, continuous ±35 V dc, continuous Input Transient Protection ANSI/IEEE C376.90.1-1989 IEEE-STD 472 IEC 255-4, Class II Output Resistance < 1 Ω Voltage Output Protection Continuous Short to Ground Power Supply Voltage Range, Operating +14 V dc to +35 V dc Current +25 mA, maximum Sensitivity ±0.0001%/% of Vs Mechanical Dimensions 1.663" x 2.11" x 0.563" (42.24 mm x 53.6 mm x 14.3 mm) Weight 60 grams Environmental Temperature Range Operating -40°C to +85°C Storage -40°C to +85°C Relative Humidity, 24 hours 0 to 90% @ +60°C non-condensing ESD Sensitivity IEC 801-2, Level 2 RFI Susceptibility ±0.5% Span error @ 400 MHz, 5 Watt, 3 ft Warm-up time required to meet specifications is approximately 10 minutes. * Contact factory for OEM requirements. 1Includes the combined effects of repeatability, hysteresis, and nonlinearity. 2Nonlinearity is calculated using best-fit straight line method. 3Vz is the nominal input voltage that results in a 0 V output. Specifications subject to change without notice.

Table 1. Pin Function Descriptions—

0 SENSOR INPUT NOT USED

1 INPUT HIGH OUTPUT HIGH

2 INPUT LOW OUTPUT LOW

3 POWER SUPPLY (DC) POWER SUPPLY (DC)

4 OUTPUT VOLTAGE INPUT VOLTAGE

5 OUTPUT & POWER

Figure 4 . Model 7B Series Module, with pin-out assignments. 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.

Figure 5. Outline Dimensions

Rev. 0 | Page 7 of 8 NOTES

Rev. 0 | Page 8 of 8 NOTES © 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the proper ty of their respective companies. D05173-0-10/04(0)