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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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5B42 датащи(PDF) 2 Page - Analog Devices |
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5B42 датащи(HTML) 2 Page - Analog Devices |
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2 / 8 page  5B42 Rev. 0 | Page 2 of 8 GENERAL DESCRIPTION The 5B42 is a single-channel signal conditioning module that interfaces with two-wire transmitters, providing an isolated, regulated 20V supply voltage. The module filters and amplifies the 4-to-20 mA process-current input to produce an accurately scaled, low-noise low-impedance output of +1 to +5 V or +2 to +10 V. True Three-Port Isolation – The floating, differential input circuit on the field side eliminates the need for any input grounding. Signal and power isolation by transformer coupling uses a proprietary modulation technique for linear, stable and reliable performance. A demodulator on the computer side of the signal transformer recovers the original signal, which is then filtered and buffered to provide a low-noise, low-impedance output signal. True three-port isolation (Input-Output-Power) includes common-mode ratings of 1500 V rms between input and output and input and power, 250V rms between power and output – no return path is required between the power and signal output commons. Accurate and Stable Performance – The 5B42 maintains accuracy over the wide operating temperature range of -40oC to +85oC through design for low parameter drift. This enables the module to provide output offset drift of only +5 uV/oC and gain drift of just +25 ppm/oC Why an Internal Current Sense Resistor? – The 5B42 offers significant advantages over signal conditioners that require an external current sense resistor. First, an external resistor is not protected from accidental connection to a 240 V rms power line. Next, the external resistor tolerance must be added to the conditioners specified errors. In contrast, the 5B42 is calibrated and specified with its internal 25Ω sense resistor. Further, the 5B42 signal input, loop supply and the sense resistor are all protected against accidental application of excess voltages up to 240V rms. Finally, there is no need to install an external sense resistor on the backplane, but if one is installed it will not affect 5B42 performance. Filtering and Protection – The 5B42 contains an optimized five-pole low-pass filter with a -3 dB bandwidth at 100Hz that provides a low-overshoot step response and exceptionally low noise of 200 uV pk-pk in a 100kHz bandwidth. Attenuation (normal mode rejection) increases at a 90 dB/decade rate beyond 100 Hz. The module protects the computer side from damage due to field-side over-voltage faults. The module withstands 240 V rms at the input terminals without damage, thereby shielding the internal computer-side circuitry from field-side over-voltage conditions. In addition, the 5B42 is mix-and-match and hot- swappable with all other 5B Series modules, so can be inserted or removed from any socket in the same backplane without disrupting system power. A series output switch eliminates the need for external multiplexing in many applications. The switch is turned on by an active-low enable input. If the switch is to be on at all times, the enable-input should be grounded to power common as it is on the 5B01 and 5B08 backplanes.. . . Figure 2 |
Аналогичный номер детали - 5B42_15 |
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Аналогичное описание - 5B42_15 |
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