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IC-RC1000 Datasheet(PDF) 8 Page - IC-Haus GmbH |
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IC-RC1000 Datasheet(HTML) 8 Page - IC-Haus GmbH |
8 / 14 page iC-RC1000 SIN/COS SIGNAL SAFETY MONITOR IC Rev C2, Page 8/14 APPLICATION NOTES Application with Series Resistors The input pins can be loaded permanently with up to 2 mA, and this permissible maximum current determines the resistor value of Rv. The input pins are limited to the supply voltage plus the clamp voltage Vc()hi by the integrated clamping circuit (see Elec.Char. No. 002). ERR Rv Rv Rv Rv iC-RC1000 PSIN NSIN PCOS NCOS GND VCC1 VCC2 OK VCC2 ERR PSIN NSIN PCOS NCOS OK VCC1 GND GND Figure 3: Overvoltage protection with external resistors In this application, the following must be paid attention to: 1. The power loss in the series resistor 2. The cut-off frequency at the input pins The following example refers to the measurings with the evaluation board RC1D. For an overvoltage capability of up to 36 V resistors of for instance 39 kΩ or 18 kΩ can be used. On the evaluation board the capacity of each input pin is approximately 10 pF. The cut-off frequency can be calculated using the capacity and the selected series resistor (Table 4). 39 kΩ 408 kHz 18 kΩ 880 kHz Table 4: Cut-off frequency (-3 dB) with series resistor A -3 dB cut-off frequency of 880 kHz means that the input amplitude at 500 kHz is already approximately 1 dB lower. Concerning the amplitude monitoring this means that the error message at 500 kHz is only carried out at a 10 % higher input amplitude. Note: The iC’s pin capacity is approximately 5 pF; additional capacitances should be kept as low as possible if higher frequency input signals are to be monitored. |
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