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LTC1065MJ8 Datasheet(PDF) 11 Page - Linear Technology |
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LTC1065MJ8 Datasheet(HTML) 11 Page - Linear Technology |
11 / 12 page 11 LTC1065 S APPLICATI I FOR ATIO An input RC can be used to attenuate incoming signals close to the filter clock frequency (Figure 10). A Bessel passband response will be maintained if the value of the input resistor follows Table 1. Table 4. Aliasing Data INPUT FREQUENCY OUTPUT FREQUENCY 0.9995 fCLK 0.0005 fCLK – 0.01 dB 0.995 fCLK 0.005 fCLK – 0.98 dB 0.99 fCLK 0.01 fCLK – 3.13 dB 0.9875 fCLK 0.0125 fCLK – 4.79 dB 0.985 fCLK 0.015 fCLK – 7.21 dB 0.9825 fCLK 0.0175 fCLK – 10.43 dB 0.98 fCLK 0.02 fCLK – 14.14 dB 0.975 fCLK 0.025 fCLK – 21.84 dB 0.97 fCLK 0.03 fCLK – 28.98 dB 0.965 fCLK 0.035 fCLK – 35.31 dB 0.96 fCLK 0.04 fCLK – 40.94 dB 0.955 fCLK 0.045 fCLK – 45.96 dB 0.95 fCLK 0.05 fCLK – 50.46 dB 0.94 fCLK 0.06 fCLK – 58.29 dB 0.93 fCLK 0.07 fCLK – 64.90 dB 0.9 fCLK 0.1 fCLK – 80.20 dB OUTPUT AMPLITUDE REFERENCED TO INPUT SIGNAL S APPLICATI TYPICAL Cascading Two LTC1065s for Steeper Roll-Off Sharing Clock for Multichannel Applications VIN VOUT 1065 F10 C V– V+ R 0.1 µF 1 2 3 4 8 7 6 5 LTC1065 0.1 µF fCLK 20 10 2 πRC ≤≤ 1 fCLK fCLK Figure 10. Adding an Input Anti-Aliasing RC VIN –5V R 5V 0.1 µF VOUT 1065 TA04 1 2 3 4 8 7 6 5 LTC1065 C 1 2 3 4 8 7 6 5 LTC1065 –5V 5V 0.1 µF 0.1 µF 0.1 µF fC ≅ (1/RC)(1/100) WIDEBAND NOISE = 110 µVRMS ATTENUATION AT f = 2fC = 60dB VIN –5V R 5V 0.1 µF VOUT 1065 TA05 1 2 3 4 8 7 6 5 LTC1065 C 1 2 3 4 8 7 6 5 LTC1065 –5V 5V 0.1 µF 0.1 µF 0.1 µF VIN VOUT 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. |
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