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LTC2481 Datasheet(PDF) 30 Page - Linear Technology |
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LTC2481 Datasheet(HTML) 30 Page - Linear Technology |
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30 / 40 page  30 LTC2481 2481f APPLICATIO S I FOR ATIO DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz) 0fS 2fS 3fS 4fS 5fS 6fS 7fS 8fS 9fS10fS11fS12fS 2481 F32 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 Figure 31. Input Normal Mode Rejection, Internal Oscillator and 50Hz Notch Mode DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz) 0fS 2481 F33 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 2fS 3fS 4fS 5fS 6fS 7fS 8fS 9fS 10fS Figure 32. Input Normal Mode Rejection at DC As a result of these remarkable normal mode specifica- tions, minimal (if any) antialias filtering is required in front of the LTC2481. If passive RC components are placed in front of the LTC2481, the input dynamic current should be considered (see Input Current section). In this case, the differential input current cancellation feature of the LTC2481 allows external RC networks without significant degrada- tion in DC performance. Traditional high order delta-sigma modulators, while pro- viding very good linearity and resolution, suffer from potential instabilities at large input signal levels. The pro- prietary architecture used for the LTC2481 third order modulator resolves this problem and guarantees a predict- able stable behavior at input signal levels of up to 150% of full scale. In many industrial applications, it is not uncom- mon to have to measure microvolt level signals superim- posed on volt level perturbations and the LTC2481 is eminently suited for such tasks. When the perturbation is differential, the specification of interest is the normal mode rejection for large input signal levels. With a reference voltage VREF = 5V, the LTC2481 has a full-scale differential input range of 5V peak-to-peak. Figures 38 and 39 show measurement results for the LTC2481 normal mode rejec- tion ratio with a 7.5V peak-to-peak (150% of full scale) input signal superimposed over the more traditional nor- mal mode rejection ratio results obtained with a 5V peak- to-peak (full scale) input signal. In Figure 38, the LTC2481 uses the internal oscillator with the notch set at 60Hz and in Figure 39 it uses the internal oscillator with the notch set at 50Hz. It is clear that the LTC2481 rejection performance INPUT SIGNAL FREQUENCY (Hz) 2481 F34 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 fN 0 2fN 3fN 4fN 5fN 6fN 7fN 8fN fN = fEOSC/5120 INPUT SIGNAL FREQUENCY (Hz) 250fN 252fN 254fN 256fN 258fN 260fN 262fN 2481 F35 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 Figure 34. Input Normal Mode Rejection at fs = 256fN Figure 33. Input Normal Mode Rejection at DC |
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