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LTC1064ACN Datasheet(PDF) 9 Page - Linear Technology |
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LTC1064ACN Datasheet(HTML) 9 Page - Linear Technology |
9 / 16 page 9 LTC1064 Mode 3 Mode 3 is the second of the primary modes. In Mode 3, the ratio of the external clock frequency to the center fre- quency of each 2nd order section can be adjusted above or below 50:1 or 100:1. Side D of the LTC1064 can only be connected in Mode 3. Figure 6 illustrates Mode 3, the classical state variable configuration, providing highpass, bandpass and lowpass 2nd order filter functions. Mode 3 is slower than Mode 1. Mode 3 can be used to make high order all-pole bandpass, lowpass, highpass and notch filters. When the internal clock-to-center frequency ratio is set at 50:1, the design equations for Q and bandpass gain are different from the 100:1 case. This was done to provide speed without penalizing the noise performance. – + ∫ ∫ LP + Σ AGND HP S 1/4 LTC1064 – BP R1 R2 VIN R3 R4 1064 F06 CC 1064 F06 Eq NOTE: THE 50:1 EQUATIONS FOR MODE 3 ARE DIFFERENT FROM THE EQUATIONS FOR MODE 3 OPERATIONS OF THE LTC1059, LTC1060 AND LTC1061. START WITH fO, CALCULATE R2/R4, SET R4; FROM THE Q VALUE, CALCULATE R3: fO = ; Q = ; H OHP = – ; fCLK 100 R2 R4 R3 R2 R2 R4 R2 R1 MODE 3 (100:1): √ √ HOBP = – ; HOLP = – R3 R1 R4 R1 fO = ; Q = ; fCLK 50 R2 R4 MODE 3 (50:1): √ R2 R3 R2 16R4 R2 R4 1.005 √ – R3 = ; THEN CALCULATE R1 TO SET THE DESIRED GAIN. + R2 1.005 Q √R2 R4 R2 16R4 R3 R1 HOHP = – ; HOBP = – ; H OLP = – R2 R1 R3 16R4 1 – R4 R1 SECONDARY MODES Mode 1b Mode 1b is derived from Mode 1. In Mode 1b, Figure 7, two additional resistors R5 and R6 are added to alternate the amount of voltage fed back from the lowpass output into the input of the SA (or SB or SC) switched-capacitor summer. This allows the filter’s clock-to-center frequency ratio to be adjusted beyond 50:1 or 100:1. Mode 1b maintains the speed advantages of Mode 1. – + ∫ ∫ LP + Σ AGND NS – BP R1 R2 VIN R3 1064 F07 R6 R5 1/4 LTC1064 1064 F07 Eq fO = ; f n = fO; Q = ; fCLK 100(50) fCLK 2 R3 R2 R2 R1 R6 R5 + R6 √ R6 R5 + R6 √ HON1(f→ 0) = HON2 f→ = – ; HOLP = – ; HOBP = – ; R5 R6 ≤ 5k R3 R1 () R6 R5 + R6 R2 R1 Mode 2 Mode 2 is a combination of Mode 1 and Mode 3, as shown in Figure 8. With Mode 2, the clock-to-center frequency ratio fCLK/fO is always less than 50:1 or 100:1. The advantage of Mode 2 is that it provides less sensitivity to resistor tolerances than does Mode 3. As in Mode 1, Mode 2 has a notch output which depends on the clock fre- quency and the notch frequency is therefore less than the center frequency fO. When the internal clock-to-center frequency ratio is set at 50:1, the design equations for Q and bandpass gain are different from the 100:1 case. ODES OF OPERATIO Figure 6. Mode 3: 2nd Order Filter Providing Highpass, Bandpass and Lowpass Figure 7. Mode 1b: 2nd Order Filter Providing Notch, Bandpass and Lowpass |
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