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LTC1068-25IG 数据表(PDF) 13 Page - Linear Technology |
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LTC1068-25IG 数据表(HTML) 13 Page - Linear Technology |
13 / 30 page LTC1068 Series 13 1068fc MODES OF OPERATION Mode 3 In Mode 3, the ratio of the external clock frequency to the center frequency of each 2nd order section can be adjusted above or below the parts nominal ratio. Figure 6 illustratesMode3,theclassicalstatevariableconfiguration, providinghighpass,bandpassandlowpass2ndorderfilter functions. Mode 3 is slower than Mode 1. Mode 3 can be used to make high order all-pole bandpass, lowpass and highpass filters. PleaserefertotheOperatingLimitsparagraphunderApplica- tions Information for a guide to the use of capacitor CC. Mode 2 Mode 2 is a combination of Mode 1 and Mode 3, shown in Figure 7. With Mode 2, the clock-to-center frequency ratio, fCLK/fO, is always less than the part’s nominal ratio. The advantage of Mode 2 is that it provides less sensitivity to resistor tolerances than does Mode 3. Mode 2 has a highpassnotchoutputwherethenotchfrequencydepends solely on the clock frequency and is therefore less than the center frequency, fO. PleaserefertotheOperatingLimitsparagraphunderApplica- tions Information for a guide to the use of capacitor CC. Figure 5. Mode 1b, 2nd Order Filter Providing Notch, Bandpass and Lowpass Outputs Figure 6. Mode 3, 2nd Order Section Providing Highpass, Bandpass and Lowpass Outputs Figure 7. Mode 2, 2nd Order Filter Providing Highpass Notch, Bandpass and Lowpass Outputs – + Σ AGND R1 N BP LP VIN 1068 F05 + – S R2 R3 CC R5 R6 fO = ; fn = fO Q = ; HON = – ; HOBP = – HOLP = – R2 R1 R3 R1 R3 R2 fCLK RATIO √ R6 (R6 + R5) R2 R1 R6 + R5 R6 √ R6 (R6 + R5) ( ) DEVICE LTC1068 LTC1068-200 LTC1068-50 LTC1068-25 RATIO 100 200 50 25 – + Σ AGND R1 HP BP LP VIN 1068 F06 + – S 1/4 LTC1068 R2 R3 CC R4 fO = fCLK RATIO R3 R2 √R2R4 R3 (RATIO)(0.32)(R4) ( ) 1 1 – R3 (RATIO)(0.32)(R4) ( ) 1 1 – ( ) √R2R4 HOHP = – ; HOBP = – R2 R1 R3 R1 R4 R1 ; HOLP = – ; Q = 1.005 DEVICE LTC1068 LTC1068-200 LTC1068-50 LTC1068-25 RATIO 100 200 50 25 – + Σ AGND R1 HPN BP LP VIN 1068 F07 + – S R2 R3 CC R4 fO = ; fn = fCLK RATIO fCLK RATIO √ R2R4 1 + Q = 1.005 R3 R2 ( )√ R2 R4 1 + R3 (RATIO)(0.32)(R4) ( ) 1 1– R3 (RATIO)(0.32)(R4) ( ) 1 1– HOHPN = – (AC GAIN, f >> fO); HOHPN = – R2 R1 R2 R1 R2 R1 1 R2 R4 1 + ( ) 1 R2 R4 1 + ( ) (DC GAIN) HOBP = – R3 R1 ; HOLP = – DEVICE LTC1068 LTC1068-200 LTC1068-50 LTC1068-25 RATIO 100 200 50 25 |
类似零件编号 - LTC1068-25IG |
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类似说明 - LTC1068-25IG |
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