Electronic Components Datasheet Search |
|
XTR115UA Datasheet(PDF) 7 Page - Burr-Brown (TI) |
|
|
XTR115UA Datasheet(HTML) 7 Page - Burr-Brown (TI) |
7 / 7 page 7 ® XTR115, XTR116 V PS 0.01 µF R L D 1 (1) NOTE: (1) Zener Diode 36V: 1N4753A or Motorola P6KE39A. Use lower voltage zener diodes with loop power supply voltages less than 30V for increased protection. See “Over-Voltage Surge Protection.” Maximum V PS must be less than minimum voltage rating of zener diode. The diode bridge causes a 1.4V loss in loop supply voltage. 1N4148 Diodes 8 1 2 3 XTR115 XTR116 V IN V REF I IN I RET V REG V+ I O E B 6 7 5 4 Q 1 R IN FIGURE 4. Reverse Voltage Operation and Over-Voltage Surge Protection. REVERSE-VOLTAGE PROTECTION The XTR115/6 low compliance voltage rating (7.5V) per- mits the use of various voltage protection methods without compromising operating range. Figure 4 shows a diode bridge circuit which allows normal operation even when the voltage connection lines are reversed. The bridge causes a two diode drop (approximately 1.4V) loss in loop supply voltage. This results in a compliance voltage of approxi- mately 9V—satisfactory for most applications. A diode can be inserted in series with the loop supply voltage and the V+ pin to protect against reverse output connection lines with only a 0.7V loss in loop supply voltage. OVER-VOLTAGE SURGE PROTECTION Remote connections to current transmitters can sometimes be subjected to voltage surges. It is prudent to limit the maximum surge voltage applied to the XTR115/6 to as low as practical. Various zener diode and surge clamping diodes are specially designed for this purpose. Select a clamp diode with as low a voltage rating as possible for best protection. For example, a 36V protection diode will assure proper transmitter operation at normal loop voltages, yet will provide an appropriate level of protection against voltage surges. Characterization tests on several production lots showed no damage with loop supply voltages up to 65V. Most surge protection zener diodes have a diode character- istic in the forward direction that will conduct excessive current, possibly damaging receiving-side circuitry if the loop connections are reversed. If a surge protection diode is used, a series diode or diode bridge should be used for protection against reversed connections. RADIO FREQUENCY INTERFERENCE The long wire lengths of current loops invite radio frequency interference. RF can be rectified by the input circuitry of the XTR115/6 or preceding circuitry. This generally appears as an unstable output current that varies with the position of loop supply or input wiring. Interference may also enter at the input terminals. For integrated transmitter assemblies with short connection to the sensor, the interference more likely comes from the current loop connections. |
Similar Part No. - XTR115UA |
|
Similar Description - XTR115UA |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |