Datenblatt-Suchmaschine für elektronische Bauteile |
|
AD590KF Datenblatt(PDF) 8 Page - Analog Devices |
|
AD590KF Datenblatt(HTML) 8 Page - Analog Devices |
8 / 16 page AD590 Data Sheet Rev. G | Page 8 of 16 NONLINEARITY Nonlinearity as it applies to the AD590 is the maximum deviation of current over temperature from a best-fit straight line. The nonlinearity of the AD590 over the −55°C to +150°C range is superior to all conventional electrical temperature sensors such as thermocouples, RTDs, and thermistors. Figure 12 shows the nonlinearity of the typical AD590K from Figure 11. Figure 12. Nonlinearity Figure 13 shows a circuit in which the nonlinearity is the major contributor to error over temperature. The circuit is trimmed by adjusting R1 for a 0 V output with the AD590 at 0°C. R2 is then adjusted for 10 V output with the sensor at 100°C. Other pairs of temperatures can be used with this procedure as long as they are measured accurately by a reference sensor. Note that for 15 V output (150°C), the V+ of the op amp must be greater than 17 V. Also, note that V− should be at least −4 V; if V− is ground, there is no voltage applied across the device. Figure 13. 2-Temperature Trim Figure 14. Typical 2-Trim Accuracy VOLTAGE AND THERMAL ENVIRONMENT EFFECTS The power supply rejection specifications show the maximum expected change in output current vs. input voltage changes. The insensitivity of the output to input voltage allows the use of unregulated supplies. It also means that hundreds of ohms of resistance (such as a CMOS multiplexer) can be tolerated in series with the device. It is important to note that using a supply voltage other than 5 V does not change the PTAT nature of the AD590. In other words, this change is equivalent to a calibration error and can be removed by the scale factor trim (see Figure 11). The AD590 specifications are guaranteed for use in a low thermal resistance environment with 5 V across the sensor. Large changes in the thermal resistance of the sensor’s environment change the amount of self-heating and result in changes in the output, which are predictable but not necessarily desirable. The thermal environment in which the AD590 is used determines two important characteristics: the effect of self- heating and the response of the sensor with time. Figure 15 is a model of the AD590 that demonstrates these characteristics. Figure 15. Thermal Circuit Model 0.8°C MAX 0.8°C MAX 1.6 –1.6 –0.8 0 0.8 –55 150 TEMPERATURE (°C) 0.8°C MAX 30pF OP177 100mV/°C VT = 100mV/°C AD590 AD581 V– 35.7kΩ R1 2kΩ 97.6kΩ R2 5kΩ 27kΩ 15V 2 –2 0 –55 0 150 100 TEMPERATURE (°C) θJC θCA TJ P CCH CC TA + – TC |
Ähnliche Teilenummer - AD590KF |
|
Ähnliche Beschreibung - AD590KF |
|
|
Link URL |
Privatsphäre und Datenschutz |
ALLDATASHEETDE.COM |
War ALLDATASHEET hilfreich? [ DONATE ] |
Über Alldatasheet | Werbung | Kontakt | Privatsphäre und Datenschutz | Linktausch | Hersteller 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 |