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LTC1064MJ Datasheet(PDF) 8 Page - Linear Technology |
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LTC1064MJ Datasheet(HTML) 8 Page - Linear Technology |
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8 / 20 page  LTC1064 8 1064fb – + ∫ ∫ LP 1064 F05 + Σ AGND 1/4 LTC1064 NS – R1 R2 VIN R3 fO = ; fn = fO; HOLP = – ; HOBP = – ; HON1 = – ; Q = fCLK 100(50) R2 R1 R3 R1 R3 R2 R2 R1 BP C2 0.1 µF C1 0.1 µF R1 1M R2 1M 1064 F04 TO FILTER FIRST SUMMING NODE C1 = C2 = LOW LEAKAGE FILM (I.E., POLYPROPYLENE) R1 = R2 = METAL FILM 1% FROM FILTER OUTPUT R3 100k – + LT1012 7 19 R21 R11 R31 4 7 LTC1064 0.1 µF 1 µF VOUT 1064 F03 10k R32 R22 R12 0.1 µF V+ TRACE FOR FILTER 0.1 µF VIN – + 10k LT ®318 LT1007 LT1056 NEGATIVE SUPPLY POSITIVE SUPPLY SEPARATE V+ POWER SUPPLY TRACE FOR BUFFER 1 µF 0.1 µF + APPLICATIONS INFORMATION Offset Nulling Lowpass filters may have too much DC offset for some users. A servo circuit may be used to actively null the offsets of the LTC1064 or any LTC switched-capacitor filter. The circuit shown in Figure 4 will null offsets to better than 300 µV. This circuit takes seconds to settle because of the integrator pole frequency. Noise All the noise performance mentioned excludes the clock feedthrough. Noise measurements will degrade if the already described grounding bypassing and buffering techniques are not practiced. The graph Wideband Noise vs Q in the Typical Performance Characteristics section is a very good representation of the noise performance of this device. Figure 3. Buffering the Output of a 4th Order Bandpass Realization Figure 4. Servo Amplifier PRIMARY MODES Mode 1 In Mode 1, the ratio of the external clock frequency to the center frequency of each 2nd order section is internally fixed at 50:1 or 100:1. Figure 5 illustrates Mode 1 provid- ing 2nd order notch, lowpass and bandpass outputs. Mode 1 can be used to make high order Butterworth lowpass filters; it can also be used to make low Q notches and for cascading 2nd order bandpass functions tuned at the same center frequency with unity gain. Mode 1 is faster than Mode 3. Note that Mode 1 can only be implemented with three of the four LTC1064 sections because Section D has no externally available summing node. Section D, however, can be internally connected in Mode 1 upon special request. ODES OF OPERATIO Figure 5. Mode 1: 2nd Order Filter Providing Notch, Bandpass and Lowpass |
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