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LT1021DCS8-10PBF Datasheet(PDF) 10 Page - Linear Technology |
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LT1021DCS8-10PBF Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  10 LT1021 1021fc APPLICATIONS INFORMATION minimized. In the current output circuit, R1 determines output current. It should have a TC commensurate with the LT1021 or track closely with the feedback resistor around the op amp. Kelvin Connections Although the LT1021 does not have true force/sense capability at its outputs, significant improvements in ground loop and line loss problems can be achieved with proper hook-up. In series mode operation, the ground pin of the LT1021 carries only ≈1mA and can be used as a sense line, greatly reducing ground loop and loss problems on the low side of the reference. The high side supplies load current so line resistance must be kept low. Twelve feet of #22 gauge hook-up wire or 1 foot of 0.025 inch printed circuit trace will create 2mV loss at 10mA output current. This is equivalent to 1LSB in a 10V, 12-bit system. The following circuits show proper hook-up to minimize errors due to ground loops and line losses. Losses in the output lead can be greatly reduced by adding a PNP boost transistor if load currents are 5mA or higher. R2 can be added to further reduce current in the output sense lead. Capacitive Loading and Transient Response The LT1021 is stable with all capacitive loads, but for optimum settling with load transients, output capacitance should be under 1000pF. The output stage of the reference is class AB with a fairly low idling current. This makes transient response worst-case at light load currents. Be- cause of internal current drain on the output, actual worst- case occurs at ILOAD = 0 on LT1021-5, ILOAD = – 0.8mA (sinking) on LT1021-7 and ILOAD = 1.4mA (sink- ing) on LT1021-10. Significantly better load transient response is obtained by moving slightly away from these points. See Load Transient Response curves for details. In general, best transient response is obtained when the output is sourcing current. In critical applications, a 10 µF solid tantalum capacitor with several ohms in series provides optimum output bypass. Standard Series Mode LT1021 OUT IN GND KEEP THIS LINE RESISTANCE LOW LOAD + INPUT GROUND RETURN 1021 AI05 Series Mode with Boost Transistor LT1021-7 OUT IN GND R3 50k RESISTOR TC DETERMINES IOUT TC TC ≤ (10 • R1) TC. R2 AND R3 SCALE WITH R1 FOR DIFFERENT OUTPUT CURRENTS * ** R1* 7.15k 1.000mA R2** 182k 1021 AI04 – + OP AMP LT1021-7 OUT IN TC TRACKING TO 50ppm/ °C GND R3 10k R1* 200 Ω 1% VOUT 6.950V R2* 14k 1% 1021 AI03 LT1021 OUT GND IN LOAD R1 220 Ω 2N3906 R2* INPUT GROUND RETURN *OPTIONAL—REDUCES CURRENT IN OUTPUT SENSE LEAD R2 = 2.4k (LT1021-5), 3k (LT1021-7), 5.6k (LT1021-10) 1021 AI06 |
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Similar Description - LT1021DCS8-10PBF |
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