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SA5230DG Datasheet(PDF) 11 Page - ON Semiconductor |
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SA5230DG Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 18 page NE5230, SA5230, SE5230 http://onsemi.com 11 What this means is that several instruments, such as a chart recorder, a meter, or a controller, as well as a long cable, can be connected in series on the loop and still obtain accurate readings if the total resistance does not exceed 650 W. Furthermore, any variation of resistance in this range will not change the output current. Any voltage output type transducer can be used, but one that does not need external DC voltage or current excitation to limit the maximum possible load resistance is preferable. Even this problem can be surmounted if the supply power needed by the transducer is compatible with the NE5230. The power goes up the line to the transducer and amplifier while the transducer signal is sent back via the current output of the NE5230 transconductance configuration. The voltage range on the input can be changed for transducers that produce a large output by simply increasing the current sense resistor to get the corresponding 4.0 to 20 mA output current. If a very long line is used which causes high line resistance, a current repeater could be inserted into the line. The same configuration of Figure 7 can be used with exception of a resistor across the input and line ground to convert the current back to voltage. Again, the current sensing resistor will set up the transconductance and the part will receive power from the line. TEMPERATURE TRANSDUCER A variation on the previous circuit makes use of the supply current control pin. The voltage present at this pin is proportional to absolute temperature (PTAT) because it is produced by the amplifier bias current through an internal resistor divider in a PTAT cell. If the control pin is connected to the input pin, the NE5230 itself can be used as a temperature transducer. If the center tap of a resistive pot is connected to the control pin with one side to ground and the other to the inverting input, the voltage can be changed to give different temperature versus output current conditions (Figure 8). For additional control, the output current is still proportional to the input voltage differential divided by the current sense resistor. When using the NE5230 as a temperature transducer, the thermal considerations in the previous section must be kept in mind. V REMOTE POWER SUPPLY NE5230 VCC VEE IOUT 3 2 4 5 6 7 + − RC RL + − NOTES: 1. IOUT = VIN/RC 2. RL MAX ≈ VREMOTE * 1.8V * VINMAX IOUT For RC = 1W IOUT 4mA 20mA VIN 4mV 20mV 200 Figure 8. NE5230 remote temperature transducer utilizing 4.0 − 20 mA current transmission. This application shows the use of the accessibility of the PTAT cell in the device to make the part, itself, a transducer. 10W |
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