Datasheet LT1027LS8 (Analog Devices) - 8

link to page 8 link to page 8 link to page 8 LT1027LS8
applicaTions inForMaTion
INPUT R1 91Ω 2N4403 LT1027LS8 IN KEEP THIS LINE RESISTANCE LOW INPUT IN OUT LT1027LS8 + OUT GND LOAD R2* + LOAD GND 2.4k 4.7µF GROUND RETURN GROUND 1027LS8 F02 RETURN 1027LS8 F03 *OPTIONAL–REDUCES CURRENT IN OUTPUT SENSE LEAD
Figure 2. Standard Connection Figure 3. Driving Higher Load Currents
The circuits in Figure 2 and Figure 3 illustrate proper con- nections to minimize errors due to ground loops and line losses. Losses in the output lead can be further reduced 100 by adding a PNP boost transistor if load current is 5mA 80 60 or higher. R2 can be added to further reduce current in 40 the output sense load. 20 (ppm) 0
Long-Term Drift
OUT∆V –20 Long-term drift cannot be extrapolated from accelerated –40 high temperature testing. This erroneous technique gives –60 drift numbers that are wildly optimistic. The only way –80 long-term drift can be determined is to measure it over –100 0 500 1000 1500 2000 2500 3000 the time interval of interest. HOURS 1027LS8 F04 The LT1027LS8 long-term drift data was collected on 80 parts that were soldered into printed circuit boards similar
Figure 4. Long-Term Drift
to a real world application. The boards were then placed into a constant temperature oven with a TA = 35°C, their outputs were scanned regularly and measured with an 8.5 digit DVM. Typical long-term drift is illustrated in Figure 4. 1027ls8f 8 For more information www.linear.com/LT1027LS8 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Typical Application Related Parts