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LTC2483CDD Datasheet(PDF) 20 Page - Linear Technology |
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LTC2483CDD Datasheet(HTML) 20 Page - Linear Technology |
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20 / 32 page  20 LTC2483 2483f APPLICATIO S I FOR ATIO performance without significant benefits of reference filter- ing and the user is advised to avoid them. Larger values of reference capacitors (CREF > 1nF) may be required as reference filters in certain configurations. Such capacitors will average the reference sampling charge and the external source resistance will see a quasi constant reference differential impedance. In the following discussion, it is assumed the input and reference common mode are the same. For the internal oscillator, the related difference resistance is 1.1M Ω and the resulting full-scale error is 0.46ppm for each ohm of source resistance driving the REF+ and REF– pins. When CA0/F0 is driven by an external oscillator with a frequency fEOSC (external conversion clock operation), the typical differential reference resistance is 0.30 • 1012/fEOSC Ω and each ohm of source resistance driving the REF+ or REF– pins will result in 1.67 • 10–6 • fEOSCppm gain error. The typical +FS and –FS errors for various combinations of source resistance seen by the REF+ or REF– pins and external capacitance connected to that pin are shown in Figures 11-14. RSOURCE (Ω) 0 –30 –10 10 10k 2483 F12 –50 –70 –40 –20 0 –60 –80 –90 10 100 1k 100k VCC = 5V VREF = 5V VIN + = 1.25V VIN – = 3.75V TA = 25°C CREF = 0.01µF CREF = 0.001µF CREF = 100pF CREF = 0pF Figure 12. –FS Error vs RSOURCE at REF+ or REF– (Small CREF) RSOURCE (Ω) 0 50 70 90 10k 2483 F11 30 10 40 60 80 20 0 –10 10 100 1k 100k VCC = 5V VREF = 5V VIN + = 3.75V VIN – = 1.25V TA = 25°C CREF = 0.01µF CREF = 0.001µF CREF = 100pF CREF = 0pF Figure 11. +FS Error vs RSOURCE at REF+ or REF– (Small CREF) Figure 13. +FS Error vs RSOURCE at REF+ or REF– (Large CREF) RSOURCE (Ω) 0 300 400 500 800 2483 F13 200 100 0 200 400 600 1000 VCC = 5V VREF = 5V VIN + = 3.75V VIN – = 1.25V TA = 25°C CREF = 1µF, 10µF CREF = 0.1µF CREF = 0.01µF RSOURCE (Ω) 0 –200 –100 0 800 2483 F14 –300 –400 –500 200 400 600 1000 VCC = 5V VREF = 5V VIN + = 1.25V VIN – = 3.75V TA = 25°C CREF = 1µF, 10µF CREF = 0.1µF CREF = 0.01µF Figure 14. –FS Error vs RSOURCE at REF+ or REF– (Large CREF) |
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