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LTC1264CS Datasheet(PDF) 8 Page - Linear Technology |
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LTC1264CS Datasheet(HTML) 8 Page - Linear Technology |
8 / 16 page 8 LTC1264 ODES OF OPERATIO tors RH and RL to create a notch. This is shown in Figure 8. Mode 3a is more versatile than Mode 2 because the notch frequency can be higher or lower than the center frequency of the 2nd order section. The external op amp of Figure 8 is not always required. When cascading the sections of the LTC1264, the highpass and lowpass outputs can be summed directly into the inverting input of the next section. Please refer to the Maximum Frequency of Operation paragraph under Applications Information for a guide to the use of capacitor CC. Mode 2n This mode extends the circuit topology of Mode 3a to Mode 2 (Figure 9) where the highpass notch and lowpass outputs are summed through two external resistors RH and RL to create a lowpass output with a notch higher in frequency than the notch in Mode 2. This mode, shown in Figure 8, is most useful in lowpass elliptic designs. When cascading the sections of the LTC1264, the highpass notch and lowpass outputs can be summed directly into the inverting input of the next section. Please refer to the Maximum Frequency of Operation paragraph under Applications Information for a guide to the use of capacitor CC. Figure 7. Mode 2, 2nd Order Filter Providing Highpass Notch, Bandpass and Lowpass Outputs – + Σ ∫ ∫ AGND R1 N BP LP VIN 1264 F07 + – S 1/4 LTC1264 R2 R3 CC R4 fi = ; fO = fi ; fn = fO fCLK 20 √ R2 R4 1 + Q = 1.005 R3 R2 ( )√ R2 R4 1 + R3 6.42•R4 ( ) 1 1 – HOHP = – (AC GAIN, f > fn); HOHPn = – R2 R1 R2 R1 1 R2 R4 1 + ( ) (DCGAIN,f<fn) HOBP = – R3 R1 R3 6.42•R4 ( ) 1 1 – ; HOLP = HOHPn Mode 3a This is an extension of Mode 3 where the highpass and lowpass output are summed through two external resis- Figure 8. Mode 3a, 2nd Order Filter Providing a Highpass Notch or Lowpass Notch Output – + Σ ∫ ∫ AGND R1 HP BP LP VIN 1264 G08 + – S R2 R3 R4 CC – + EXTERNAL OP AMP OR INPUT OP AMP OF THE LTC1264, SIDES A, B, C, D HIGHPASS OR LOWPASS NOTCH OUTPUT RG RL RH 1/4 LTC1264 R2 R1 ( ) RG RH () fi = ; fn = fi ; fO = fi HOHPn (f = ∞) = ; HOLPn (f = 0) = fCLK 20 √RH RL √R2 R4 Q = 1.005 R3 R2 √R2 R4 R3 6.42•R4 ( ) 1 1 – ( ) R4 R1 ( ) RG RL () |
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