поискавой системы для электроныых деталей |
|
LM208AJ-8 датащи(PDF) 5 Page - National Semiconductor (TI) |
|
|
LM208AJ-8 датащи(HTML) 5 Page - National Semiconductor (TI) |
5 / 8 page Application Hints A very low drift amplifier poses some uncommon application and testing problems Many sources of error can cause the apparent circuit drift to be much higher than would be pre- dicted Thermocouple effects caused by temperature gradient across dissimilar metals are perhaps the worst offenders Only a few degrees gradient can cause hundreds of micro- volts of error The two places this shows up generally are the package-to-printed circuit board interface and tempera- ture gradients across resistors Keeping package leads short and the two input leads close together helps greatly Resistor choice as well as physical placement is important for minimizing thermocouple effects Carbon oxide film and some metal film resistors can cause large thermocouple er- rors Wirewound resistors of evanohm or manganin are best since they only generate about 2 mV C referenced to cop- per Of course keeping the resistor ends at the same tem- perature is important Generally shielding a low drift stage electrically and thermally will yield good results Resistors can cause other errors besides gradient generat- ed voltages If the gain setting resistors do not track with temperature a gain error will result For example a gain of 1000 amplifier with a constant 10 mV input will have a 10V output If the resistors mistrack by 05% over the operating temperature range the error at the output is 50 mV Re- ferred to input this is a 50 mV error All of the gain fixing resistor should be the same material Testing low drift amplifiers is also difficult Standard drift testing technique such as heating the device in an oven and having the leads available through a connector thermo- probe or the soldering iron methoddo not work Thermal gradients cause much greater errors than the amplifier drift Coupling microvolt signal through connectors is especially bad since the temperature difference across the connector can be 50 C or more The device under test along with the gain setting resistor should be isothermal Schematic Diagram TLH7759 – 6 5 |
Аналогичный номер детали - LM208AJ-8 |
|
Аналогичное описание - LM208AJ-8 |
|
|
ссылки URL |
Конфиденциальность |
ALLDATASHEETRU.COM |
Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | обмен ссыками | поиск по производителю 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 |