7B30

7B30 Isolated, Voltage or Current Input Data Sheet (REV. 0)

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• Manufacturer or author: Provided By digicamel.com
• PDF pages: 8

Technical content

Isolated, Voltage or Current Input 7B30 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 millivolt and voltage inputs. Provides a protected precision output of either +1 V to +5 V or 0 V to +10 V. A plug-in 250W current sensing resistor is provided to measure a process current input. All 7B30 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. 7B30 Functional Block Diagram isolation of the input signals. reliability of each module’s electrical connection.

Rev. 0 | Page 2 of 8 GENERAL DESCRIPTION The 7B30 is a single-channel signal conditioning module that interfaces, amplifies and filters unipolar and bipolar milli-vilt and voltage inputs and provides a protected precision output of either +1 V to +5 V or 0V to +10 V . To measure a process current input, a plug-in 250W current sensing resistor, Model AC1391, may be installed directly on the 7B backplane, using available pin sockets. The external current sense resistor allows the current loop to be maintained even when the module is removed from the backplane. Model 7B30 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 160 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 7B30 is nix- 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 7B30 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 amplifier. Amplitude modulation is used to implement transformer isolation (1500 V rms input-t-output and power). Isolated front-end circuitry power is supplied by a DC/DC converter. The output section contains a 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 7B30 Models Available Model Input Range Output Range 7B30-01-1 0 mV to +10 mV +1 V to +5 V 7B30-01-2 0 mV to +10 mV 0 V to +10 V 7B30-02-1 0 mV to +100 mV +1 V to +5 V 7B30-02-2 0 mV to +100 mV 0 V to +10 V 7B30-03-1 0 V to +1 V +1 V to +5 V 7B30-03-2 0 V to +1 V 0 V to +10 V 7B30-05-1 +1 V to +5 V +1 V to +5 V 7B30-05-1 +4 mA to +20 mA1 +1 V to +5 V 7B30-05-2 +1 V to +5 V 0 V to +10 V 7B30-05-2 0 mA to +20 mA1 0 V to +10 V 7B30-06-1 -10 mV to +10 mV +1 V to +5 V 7B30-06-2 -10 mV to +10 mV 0 V to +10 V 7B30-07-1 -100 mV to +100 mV +1 V to +5 V 7B30-07-2 -100 mV to +100 mV 0 V to +10 V 7B30-08-1 -1 V to +1 V +1 V to +5 V 7B30-08-2 -1 V to +1 V 0 V to +10 V 1Models 7B30-05-1 and 7B30-05-2 may be used to measure a process current input by installing a 250 Ω current sensing resistor, such as Model AC1391, on the backplane. With this resistor installed, the current loop is maintained even when the module is removed from the backplane. 7B30 Specifications (typical @ +23°C ±5°C and Vs = +24 V dc) Description Model 7B30 Range1 Standard Range ±10 mV to ±1 V (Refer to Model Table) Custom Ranges Not Available* Output Range Options (RL > 2 kΩ) +1 V to +5 V or 0 V to +10 V Accuracy2 Initial @ +25°C ±0.01% Span (±0.1% Span, maximum) Nonlinearity 3 ±0.02% Span, maximum Input Offset vs. Temperature ±0.5 µV/°C Zero Suppression vs. Temperature ±0.005% (V z)4/°C Span vs. Temperature ±35 ppm/°C Output Offset vs. Temperature ±0.002% Span/°C

Rev. 0 | Page 4 of 8 Input Bias Current ±1 nA Input Resistance Power ON 10 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 0.6 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 160 dB Normal Mode Rejection @ 50/60 Hz 60 dB Input Protection 120 V rms, continuous±35 V dc, continuous Input Transient Protection ANSI/IEEE C376.90 .1-1989IEEE-STD 472IEC 255-4, Class II Output Resistance < 1 Ω 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 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. 1 Model 7B30 may be used to measure a process current input by installing a 250 Ω current sensing resistor, such as Model AC1391, on the backplane. With this resistor, the current loop is maintained even when the 7B30 module is removed form the backplane. 2 Includes the combined effects of repeatability, hysteresis, and nonlinearity. 3 Nonlinearity is calculated using best-fit straight line method. 4 Vz 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. D05172-0-10/04(0)