5B39 ISOLATED CURRENT OUTPUT




Functional Description

5B39-03 The 5B39 is a single-channel signal conditioning module that converts a high-level analog input voltage into a floating, isolated proportional output current of 4 to 20 mA or 0 to 20 mA, across loads from 0 Ω to 750 Ω. The module provides high accuracy of ±0.05%, low nonlinearity of ±0.02%, and the protection of 1500 V rms isolation between output-to-input and output-to-power supply. The input common must be held to within ±1 V of power common.

Inside the 5B39
Signal isolation by transformer coupling uses a proprietary modulation technique for linear, stable and reliable performance. A demodulator on the output side of the signal transformer recovers the original signal, which is then filtered and converted to an accurate current output by a current (V-to-I) converter output stage. Output protection enables the 5B39 to withstand accidental connection to 240 V rms power lines without damage, while isolating computer-side circuitry. In addition, the 5B39 is mix-and-match and hot-swappable with all 5B Series modules, so can be inserted or removed from any socket in the same backplane without disrupting system power.

Track-and-Hold for DAC Applications
In applications where a single system digital-to-analog converter (DAC) is used to drive a number of current output channels, the 5B39 includes a track-and-hold input circuit. Selected by a high Write Enable input, the hold mode exhibits an output droop rate of 80 µA/s. This corresponds to a refresh interval of 25 ms for 0.01% span droop. On power-up, the module's output remains at 0 mA for about 100 ms to allow the user to initialize the track-and-hold circuit.

In applications using one DAC per channel, where the track-and-hold feature of the 5B39 is not used, the Write Enable input should be set to low by grounding it to power common, as on the 5B01 and 5B08 backplanes. The module current output will then track its input signal.

Generating A Voltage Output Signal
The 0 to 20 mA output of the 5B39-04 and the 5B39-03, can produce a 0 to +10 V output by connecting a 500 Ω conversion resistor across the module's output terminals. This approach should be used with caution because the output lacks the low impedance of a true voltage source. This means that the tolerance and size of the load impedance relative to the conversion resistor can introduce significant error. For example, a load impedance < 500 kΩ would contribute < 0.1% error.



5B39 FBD

Figure 1. 5B39 Functional Block Diagram

 

Input Ranges

0 to +5 V or -5 to +5 V

Output Ranges

4 to 20 mA or 0 to 20 mA

   AN0022   
5B39 OFC
Figure 2. 5B39 Output Field Connections


5B39 Models Available
  Model Input Range Output Range
Order Now5B39-010 V to +5 V4 mA to 20 mA
Order Now5B39-02-5 V to +5 V4 mA to 20 mA
Order Now5B39-030 V to +5 V0 mA to 20 mA
Order Now5B39-04-5 V to +5 V0 mA to 20 mA


5B39 Specifications
(typical @ +25°C and Vs = +5 V dc)
Description Model 5B39
Input Voltage Ranges0 V to +5 V or -5 V to +5 V
Input, Without Damage-10 V to +10 V, maximum
Input Resistance10 MΩ
Output Ranges
Standard Ranges4 mA to 20 mA or 0 mA to 20 mA
Custom RangesNot Available
Output Overrange Capability10%
Output Load Resistance Range0 to 650Ω (Vs > +4.75 V)
0 to 750 Ω (Vs > +4.95 V)
Voltage Output ProtectionContinuous Short to Ground
Output Under Fault26 mA maximum
Output Protection
Normal Mode, Continuous240 V rms, maximum
TransientANSI/IEEE C37.90.1-1989
Accuracy1
Initial @ +25°C±0.05% Span
Nonlinearity±0.02% Span
Zero vs. Temperature±0.5 µA/°C
Span vs. Temperature±0.002% of Reading/°C
Noise
Output Ripple, 100 Hz Bandwidth30 µA peak-peak
Bandwidth, -3 dB400 Hz
Output Rise Time, 10% to 90% Span2 ms
Common-Mode Voltage (CMV)
Output-to-Input and Power Supply1500 V rms, maximum
Input-to-Power, Continuous2±1 V, maximum
Output Transient ProtectionANSI/IEEE C37.90.1-1989
Common Mode Rejection (CMR)
1 kΩ Source Imbalance, 50/60 Hz90 dB
Normal Mode Rejection (NMR)-3 dB @ 400 Hz
Sample and Hold
Output Droop Rate80 µA/s
Acquisition Time50 µs
Track-and-Hold Enable Control
Max Logic "0"+1 V
Min Logic "1"+2.5 V
Max Logic "1"+36 V
Input Current "0"1.5 mA
Power Supply Voltage+5 V ±5%
Power Supply Current170 mA
Power Supply Sensitivity, RTI±0.25µA/Vs%
Mechanical Dimensions2.275" x 2.375" x 0.595"
(57.8 mm x 59.1 mm x 15.1 mm)
Environmental
Temperature Range
   Rated Performance-25°C to +85°C
   Operating-40°C to +85°C
   Storage-40°C to +85°C
Relative Humidity0 to 93% @ +40°C noncondensing
RFI Susceptibility±0.5% Span error @ 400 MHz, 5 Watt, 3 ft
1Includes the combined effects of repeatability, hysteresis, and nonlinearity.
2The input common must be kept within ±1 V of power common.
Specifications subject to change without notice. small back to top on right and blue line
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