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LTC2400CS8 数据表(PDF) 24 Page - Linear Technology |
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LTC2400CS8 数据表(HTML) 24 Page - Linear Technology |
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24 / 40 page  24 LTC2400 VREF = 5V). This corresponds to a 0.3ppm shift in offset and full-scale readings for every 1 Ω of input source resistance. In addition to the input current spikes, the input ESD protection diodes have a temperature dependent leakage current. This leakage current, nominally 1nA ( ±10nA max), results in a fixed offset shift of 10 µV for a 10k source resistance. Reference Current (VREF) Similar to the analog input, the reference input has a dynamic input current. This current has negligible effect on the offset. However, the reference current at VIN = VREF is similar to the input current at full-scale. For large values of reference capacitance (CVREF > 0.01µF), the full-scale error shift is 0.3ppm/ Ω of external reference resistance independent of the capacitance at VREF, see Figure 22. If the capacitance tied to VREF is small (CVREF < 0.01µF), an input resistance of up to 20k (20pF parasitic capacitance at VREF) may be tolerated, see Figure 23. Unlike the analog input, the integral nonlinearity of the device can be degraded with excessive external RC time constants tied to the reference input. If the capacitance at node VREF is small (CVREF < 0.01µF), the reference input can tolerate large external resistances without reduction in INL, see Figure 24. If the external capacitance is large (CVREF > 0.01µF), the linearity will be degraded by 0.15ppm/ Ω independent of capacitance at VREF, see Figure 25. APPLICATIONS INFORMATION RESISTANCE AT VREF (Ω) 0 0 100 200 300 400 500 600 200 400 600 800 2400 F22 1000 CVREF = 10µF CVREF = 0.01µF CVREF = 0.1µF VCC = 5V VREF = 5V VIN = 5V TA = 25°C CVREF = 1µF Figure 22. Full-Scale Error vs RVREF (Large C) RESISTANCE AT VREF(Ω) 1 30 40 50 1k 2400 F23 20 10 10 100 100k 10k 0 –10 –20 VCC = 5V VREF = 5V VIN = 5V TA = 25°C CVREF = 100pF CVREF = 1000pF CVREF = 0.01µF CVREF = 0pF Figure 23. Full-Scale Error vs RVREF (Small C) RESISTANCE AT VREF (Ω) 1 –10 0 10 20 30 40 50 10 100 1k 10k 2400 F24 100k VCC = 5V VREF = 5V TA = 25°C CVREF = 0pF CVREF = 100pF CVREF = 1000pF CVREF = 0.01µF Figure 24. INL Error vs RVREF (Small C) RSOURCE (Ω) 0 –300 –250 –200 –150 –100 –50 0 200 400 600 800 2400 F21 1000 CIN = 0.01µF VCC = 5V VREF = 5V VIN = 5V TA = 25°C CIN = 0.1µF CIN = 1µF CIN = 10µF Figure 21. Full-Scale Error vs RSOURCE (Large C) |
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