7B31-07-2 [ADI]

Isolated Voltage Input; 隔离电压输入


型号：	7B31-07-2
厂家：	ADI
描述：	Isolated Voltage Input 隔离电压输入模拟IC 信号电路
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Isolated Voltage Input

7B31

FUNCTIONAL BLOCK DIAGRAM

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

Figure 1. 7B31 Functional Block Diagram

The modules feature a maximum nonlinearity of +0.02% and

are factory calibrated to guarantee a maximum accuracy

specification of +0.1%.

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

+85^oC 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.

The 7B Series offers up to 1500 V rms continuous common

mode voltage isolation and 120 V rms of field wiring input

protection. The power supplies necessary to drive each of the

individual module’s input circuitry are internally isolated,

enabling the 7B Series modules to offer true channel-to-channel

isolation of the input signals.

The modules directly accept analog signals from

thermocouples, RTDs, current loop powered transmitters, and

other process control signals. The 7B Series modules amplify,

linearize, isolate, protect and convert the transducer output

signals to standardized analog inputs for high-level analog I/O

subsystems. The 7B Series Subsystem consists of 19-inch rack-

compatible hardware (model AC 1363), with universal

mounting backplane and a family of plug-in (up to 16 per

backplane) input and output signal conditioning modules. Four-

, eight-, and sixteen-channel backplanes are available. Each

backplane incorporates screw terminals for easy power

connections and field wiring, and includes a 25-pin D-type

connector for interfacing the high-level single-ended voltage

outputs to the user’s equipment. Gold-plated sockets are

provided on each channel of the backplane to ensure the

reliability of each module’s electrical connection.

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.

Tel: 781.329.4700

Fax: 781.326.8703

www.analog.com

7B31

GENERAL DESCRIPTION

front-end circuitry power is supplied by a DC/DC converter.

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 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.

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

Figure 2

Rev. 0 | Page 2 of 8

7B31

7B31 Models Available

Model

7B31-01-1

7B31-01-2

7B31-02-1

7B31-02-2

7B31-03-1

7B31-03-2

7B31-04-1

7B31-04-2

7B31-05-1

7B31-05-2

7B31-06-1

7B31-06-2

7B31-07-1

7B31-07-2

7B31-08-1

7B31-08-2

Input Range

0 V to +10 V

-5 V to +5 V

-10 V to +10 V

0 V to +5 V

Output Range

+1 V to +5 V

0 V to +10 V

+1 V to +5 V

0 V to +10 V

+1 V to +5 V

0 V to +10 V

+1 V to +5 V

0 V to +10 V

+1 V to +5 V

0 V to +10 V

+1 V to +5 V

0 V to +10 V

+1 V to +5 V

0 V to +10 V

+1 V to +5 V

0 V to +10 V

0 V to +5 V

0 V to +20 V

-20 V to +20 V

0 V to +50 V

-50 V to +50 V

7B31 Specifications

(typical @ +23°C ±5°C and V_s= +24 V dc)

Description

Input Ranges

Model 7B31

(Refer to Model Table)

Standard Unipolar Ranges

Standard Bipolar Ranges

Custom Ranges

0 V to: +5 V or +10 V or +20 V or +50 V

±5 V or ±10 V or ±20 V or ±50 V

Not Available*

+1 V to +5 V or 0 V to +10 V

Output Range Options (R_L> 2 kΩ)

Accuracy¹

Initial @ +25°C

±0.01% Span (±0.1% Span, maximum)

±0.02% Span, maximum

±0.5µV/°C

Nonlinearity²

Input Offset vs. Temperature

Zero Suppression vs. Temperature

Span vs. Temperature

Output Offset vs. Temperature

±0.005% (V_z)³/°C

±35 ppm/°C

±0.002% span/°C

Input Resistance

Power ON

7B31-01 to 7B31-04

100 kΩ

Rev. 0 | Page 3 of 8

7B31

7B31-05 to 7B31-08

Power OFF

1 MΩ

30 kΩ, minimum

Output Noise

5 MHz Bandwidth

6 mV peak

10 Hz to 100 kHz Bandwidth

0.1 Hz to 10 Hz Bandwidth

Bandwidth, -3 dB

0.4 mV rms

3 µV peak

3 Hz

150 ms

Output Rise Time, 10% to 90% Span

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

Normal Mode Rejection @ 50/60 Hz

Input Protection

120 dB

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

Current

+14 V dc to +35 V dc

+25 mA, maximum

±0.0001%/% of Vs

Sensitivity

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

ESD Sensitivity

RFI Susceptibility

0 to 90% @ +60°C non-condensing

IEC 801-2, Level 2

±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.

Rev. 0 | Page 4 of 8

7B31

PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS

Figure 3 7B31 Input Field Connections

Table 1. Pin Function Descriptions—

No.

Input Module Function

Output Module Function

SENSOR INPUT

INPUT HIGH

NOT USED

OUTPUT HIGH

OUTPUT LOW

POWER SUPPLY (DC)

INPUT VOLTAGE

INPUT LOW

POWER SUPPLY (DC)

OUTPUT VOLTAGE

OUTPUT & POWER

COMMON

INPUT AND POWER

COMMON

Figure 4 . Model 7B 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

7B31

OUTLINE DIMENSIONS

Figure 5. Outline Dimensions

Rev. 0 | Page 6 of 8

7B31

NOTES

Rev. 0 | Page 7 of 8

7B31

NOTES

registered trademarks are the property of their respective companies.

D05173-0-10/04(0)

Rev. 0 | Page 8 of 8

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