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LTC1067 Datasheet(PDF) 11 Page - Linear Technology |
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LTC1067 Datasheet(HTML) 11 Page - Linear Technology |
11 / 20 page 11 LTC1067/LTC1067-50 ODES OF OPERATIO Mode 3a This is an extension of Mode 3 where the highpass and lowpass outputs are summed through two external resis- tors, RH and RL, to create a notch (see Figure 7). Mode 3a is more versatile than Mode 2 because the notch fre- quency can be higher or lower than the center frequency of the 2nd order section. The external op amp of Figure 7 is not always required. When cascading the sections of the LTC1067, the highpass and lowpass outputs can be summed directly into the inverting input of the next section. Please refer to the Operating Limits paragraph under Appli- cations Information for a guide to the use of capacitor CC. Figure 7. Mode 3a, 2nd Order Filter Providing a Highpass Notch or Lowpass Notch Output Mode 2n This mode extends the circuit topology of Mode 3a to Mode 2 (Figure 8) 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 LTC1067, the highpass- notch and lowpass outputs can be summed directly into the inverting input of the next section. Please refer to the Operating Limits paragraph under Appli- cations Information for a guide to the use of capacitor CC. Figure 8. Mode 2n, 2nd Order Filter Providing a Lowpass Notch Output – + Σ ∫ ∫ AGND R1 HP BP LP VIN 1067 F07 + – S R2 R3 R4 CC – + EXTERNAL OP AMP OR INPUT OP AMP OF THE LTC1067, SIDES A OR B HIGHPASS OR LOWPASS NOTCH OUTPUT RG RL RH R2 R1 ( ) RG RH () fO = ; fn = HOHPn (f = ∞) = ; HOLPn (f = 0) = fCLK RATIO fCLK RATIO √RH RL √R2 R4 Q = 1.005 R3 R2 √R2 R4 ( ) R4 R1 ( ) RG RL () NOTE: RATIO = 100 FOR LTC1067 = 50 FOR LTC1067-50 R3 (RATIO)(0.32)(R4) ( ) 1 1 – – + Σ ∫ ∫ AGND R1 HP BP LP VIN 1067 F08 + – S R2 R3 R4 CC – + EXTERNAL OP AMP OR INPUT OP AMP OF THE LTC1067, SIDES A OR B LOWPASS NOTCH OUTPUT RG RL RH fO = fn = HOLPn (f = 0)= + fCLK RATIO fCLK RATIO √ RH RL 1 + R2 R1 RG RL RG RH () 1 R2 R4 1 + ( ) ( ) √ R2 R4 1 + Q = 1.005 R3 R2 ( )√ R2 R4 1 + NOTE: RATIO = 100 FOR LTC1067 = 50 FOR LTC1067-50 R3 (RATIO)(0.32)(R4) ( ) 1 1 – |
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Similar Description - LTC1067_15 |
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