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LTC2481 Datasheet(PDF) 25 Page - Linear Technology |
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LTC2481 Datasheet(HTML) 25 Page - Linear Technology |
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25 / 40 page  25 LTC2481 2481f APPLICATIO S I FOR ATIO Figure 20. INL vs DIFFERENTIAL Input Voltage and Reference Source Resistance for CREF > 1µF VIN/VREF (V) – 0.5 2 6 10 0.3 2481 F21 –2 –6 0 4 8 –4 –8 –10 – 0.3 – 0.1 0.1 0.5 VCC = 5V VREF = 5V VIN(CM) = 2.5V TA = 25°C CREF = 10µF R = 1k R = 100 Ω R = 500 Ω external oscillator with a frequency fEOSC (external conver- sion clock operation), the typical differential reference resis- tance 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 16-19. In addition to this gain error, the converter INL perfor- mance is degraded by the reference source impedance. The INL is caused by the input dependent terms –VIN2/(VREF • REQ) – (0.5 • VREF • DT)/REQ in the reference pin current as expressed in Figure 12. When using internal oscillator and 60Hz mode, every 100 Ω of reference source resistance translates into about 0.67ppm additional INL RSOURCE (Ω) 0 –30 –10 10 10k 2481 F18 –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 17. –FS Error vs RSOURCE at REF+ or REF– (Small CREF) RSOURCE (Ω) 0 50 70 90 10k 2481 F17 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 16. +FS Error vs RSOURCE at REF+ or REF– (Small CREF) Figure 18. +FS Error vs RSOURCE at REF+ or REF– (Large CREF) RSOURCE (Ω) 0 300 400 500 800 2481 F19 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 2481 F20 –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 19. –FS Error vs RSOURCE at REF+ or REF– (Large CREF) |
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