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LT1021DCS8-10 Datasheet(PDF) 13 Page - Linear Technology |
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LT1021DCS8-10 Datasheet(HTML) 13 Page - Linear Technology |
13 / 16 page ![]() 13 LT1021 1021fc TYPICAL APPLICATIONS Precision DAC Reference with System TC Trim Strain Gauge Conditioner for 350 Ω Bridge Negative Shunt Reference Driven by Current Source LT1021-10 OUT IN GND 1021 TA17 15V 8.87k 1% 1.24k 1% 10k 1% D1 1N457 50k TC TRIM* 10k 1% D2 1N457 50k 200k 1% 50k ROOM TEMP TRIM 10.36k 1% 8.45k 1mA TRIMS 1mA REFERENCE CURRENT TC BY ±40ppm/°C. THIS TRIM SCHEME HAS VERY LITTLE EFFECT ON ROOM TEMPERATURE CURRENT TO MINIMIZE ITERATIVE TRIMMING * DAC Handling Higher Load Currents LT1021-10 OUT GND IN 1021 TA08 RL 30mA 15V R1* 169 Ω VOUT 10V TYPICAL LOAD CURRENT = 30mA SELECT R1 TO DELIVER TYPICAL LOAD CURRENT. LT1021 WILL THEN SOURCE OR SINK AS NECESSARY TO MAINTAIN PROPER OUTPUT. DO NOT REMOVE LOAD AS OUTPUT WILL BE DRIVEN UNREGULATED HIGH. LINE REGULATION IS DEGRADED IN THIS APPLICATION * LT1021-10 OUT IN GND 1021 TA09 – + LM301A † 100pF 8 1 6 6 3 2 –5V 357 Ω 1/2W –15V R5 2M R6* 2M LT1012C 2 3 R4 20k R2 20k 5V R3 2M VOUT ×100 350 Ω STRAIN GAUGE BRIDGE** 28mA 28.5mA R1 357 Ω 1/2W 15V THIS RESISTOR PROVIDES POSITIVE FEEDBACK TO THE BRIDGE TO ELIMINATE LOADING EFFECT OF THE AMPLIFIER. EFFECTIVE ZIN OF AMPLIFIER STAGE IS ≥1MΩ. IF R2 TO R5 ARE CHANGED, SET R6 = R3 * BRIDGE IS ULTRALINEAR WHEN ALL LEGS ARE ACTIVE, TWO IN COMPRESSION AND TWO IN TENSION, OR WHEN ONE SIDE IS ACTIVE WITH ONE COMPRESSED AND ONE TENSIONED LEG OFFSET AND DRIFT OF LM301A ARE VIRTUALLY ELIMINATED BY DIFFERENTIAL CONNECTION OF LT1012C ** † LT1021-10 OUT GND 1021 TA14 2.5mA –10V (ILOAD ≤ 1mA) –11V TO – 40V 27 Ω LM334 |
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