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LTC1164-6 Datasheet(PDF) 11 Page - Linear Technology |
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LTC1164-6 Datasheet(HTML) 11 Page - Linear Technology |
11 / 12 page 11 LTC1164-6 Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. S APPLICATI TYPICAL 8th Order Low Power, Clock-Tunable Elliptic Filter with Active RC Input Anti-Aliasing Filter and Output Smoothing Filter 1 2 3 4 5 6 7 14 13 12 11 10 9 8 VIN 5V fCLK 1164-6 TA03 LTC1164-6 1 µF 15k 10k 1 2 3 4 5 6 7 14 13 12 11 10 9 8 IC1 C1 0.01 µF R1 789 Ω 5V 0.1 µF 1k 5V 0.1 µF 5V IC2 LTC1164-6 R2 7.89k C2 0.001 µF VOUT + VS = SINGLE 5V, IS = 5mA TYP 16TH ORDER LOWPASS FILTER FIXED fCUTOFF, fCLK = 540kHz fCUTOFF = 10kHz (fCLK/fC) = 54:1 1/2 πR1C1 = 1/2πR2C2 = 2fCUTOFF Gain vs Frequency FREQUENCY (kHz) 1 10 1164-6 TA04 10 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 30 VS = SINGLE 5V IS = 5mA, 16TH ORDER ELLIPTIC LOWPASS fCLK = 540kHz fCUTOFF = 10kHz FREQUENCY (kHz) 1 5 1164-6 TA05 – 40 –45 – 50 –55 –60 –65 –70 –75 –80 –85 –90 10 VS = SINGLE 5V IS = 5mA, 16TH ORDER ELLIPTIC LOWPASS VIN = 0.5VRMS fCLK = 540kHz fC = 10kHz THD + Noise vs Frequency 1 2 3 4 5 6 7 14 13 12 11 10 9 8 LTC1164-6 VIN VOUT fCLK V– fC = 1kHz ATTENUATION AT 10kHz = –48dB 1164-6 TA10 0.1 µF V+ 0.1 µF V– – + 1/2 LT1013 R3 5.62k R2 76.8k R1 1.15k C3 0.001 µF C2 0.022 µF C1 0.1 µF R2 97.6k R1 16.9k C2 0.001 µF C1 0.0047 µF fC = 1kHz ATTENUATION AT 10kHz = – 30dB 100Hz ≤ fC ≤ 1kHz 10kHz ≤ fCLK ≤ 100kHz NOTES: 1. CLOCK-TUNABLE OVER ONE DECADE OF CUTOFF FREQUENCY. 2. BOTH INPUT AND OUTPUT RC ACTIVE FILTERS ARE 0.1dB CHEBYSHEV FILTERS WITH 1kHz RIPPLE BANDWIDTH. – + 1/2 LT1013 Single 5V, 16th Order Lowpass Filter fCUTOFF = 10kHz |
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