Electronic Components Datasheet Search |
|
LTC1655 Datasheet(PDF) 11 Page - Linear Technology |
|
LTC1655 Datasheet(HTML) 11 Page - Linear Technology |
11 / 16 page 11 LTC1655/LTC1655L TYPICAL APPLICATIONS This circuit shows how to use an LTC1655 to make an optoisolated digitally controlled 4mA to 20mA process controller. The controller circuitry, including the optoisolation, is powered by the loop voltage that can have a wide range of 6V to 30V. The 2.048V reference output of the LTC1655 is used for the 4mA offset current and VOUT is used for the digitally controlled 0mA to 16mA current. RS is a sense resistor and the op amp modulates the transistor Q1 to provide the 4mA to 20mA current through this resistor. The potentiometers allow for offset and full- scale adjustment. The control circuitry dissipates well under the 4mA budget at zero scale. 1655/55L TA03 3k 10k 1k 75k 1% 5k 150k 1% 20k Q1 2N3440 RS 10 Ω VLOOP 6V TO 30V IOUT OUT IN CLK DIN CS/LD CLK DIN CS/LD CLK DIN CS/LD VCC VOUT 1 µF LTC1655 4N28 OPTOISOLATORS 5V 500 Ω LT ®1121-5 FROM OPTOISOLATED INPUTS VREF GND – + LT ®1077 1 86 5 7 2 3 6 7 4 3 2 An Isolated 4mA to 20mA Process Controller |
Similar Part No. - LTC1655_15 |
|
Similar Description - LTC1655_15 |
|
|
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 |