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LTC1164-5 Datasheet(PDF) 10 Page - Linear Technology |
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LTC1164-5 Datasheet(HTML) 10 Page - Linear Technology |
10 / 16 page LTC1164-5 10 11645fc Aliasing Aliasing is an inherent phenomenon of sampled data systems and it occurs when input frequencies close to the sampling frequency are applied. For the LTC1164-5 case at 100:1, an input signal whose frequency is in the range of fCLK ±2.5% will be aliased back into the filter’s pass- band. If, for instance, an LTC1164-5 operating with a 100kHz clock and 1kHz cutoff frequency receives a 98kHz 10mV input signal, a 2kHz 56 µV alias signal will appear at its output. When the LTC1164-5 operates with a clock-to- cutoff frequency of 50:1, aliasing occurs at twice the clock frequency. Table 4 shows details. Table 4. Aliasing Data (fCLK = 100kHz, VS = ±5V) INPUT FREQUENCY OUTPUT LEVEL OUTPUT FREQUENCY (VIN = 1VRMS) (Relative to Input) (Aliased Frequency) (fCLK/fC) = 100:1, fCUTOFF = 1kHz 97.0kHz –102.0dB 3.0kHz 97.5kHz – 65.0dB 2.5kHz 98.0kHz – 45.0dB 2.0kHz 98.5kHz – 23.0dB 1.5kHz 99.0kHz – 4.0dB 1.0kHz 99.5kHz – 0.3dB 0.5kHz (fCLK/fC) = 50:1, fCUTOFF = 2kHz 197.0kHz – 23.0dB 3.0kHz 197.5kHz –12.0dB 2.5kHz 198.0kHz – 5.0dB 2.0kHz 198.5kHz –1.8dB 1.5kHz 199.0kHz –1.0dB 1.0kHz 199.5kHz – 0.8dB 0.5kHz Table 5. Transient Response of LTC Lowpass Filters DELAY RISE SETTLING OVER- TIME* TIME** TIME*** SHOOT LOWPASS FILTER (SEC) (SEC) (SEC) (%) LTC1064-3 Bessel 0.50/fC 0.34/fC 0.80/fC 0.5 LTC1164-5 Bessel 0.43/fC 0.34/fC 0.85/fC 0 LTC1164-6 Bessel 0.43/fC 0.34/fC 1.15/fC 1 LTC1264-7 Linear Phase 1.15/fC 0.36/fC 2.05/fC 5 LTC1164-7 Linear Phase 1.20/fC 0.39/fC 2.20/fC 5 LTC1064-7 Linear Phase 1.20/fC 0.39/fC 2.20/fC 5 LTC1164-5 Butterworth 0.80/fC 0.48/fC 2.40/fC 11 LTC1164-6 Elliptic 0.85/fC 0.54/fC 4.30/fC 18 LTC1064-4 Elliptic 0.90/fC 0.54/fC 4.50/fC 20 LTC1064-1 Elliptic 0.85/fC 0.54/fC 6.50/fC 20 * To 50% ±5%, ** 10% to 90% ±5%, *** To 1% ±0.5% APPLICATIO S I FOR ATIO Any parasitic switching transients during the rise and fall edges of the incoming clock are not part of the clock feedthrough specifications. Switching transients have fre- quency contents much higher than the applied clock; their amplitude strongly depends on scope probing techniques as well as grounding and power supply bypassing. The clock feedthrough, if bothersome, can be greatly reduced by adding a simple R/C lowpass network at the output of the filter pin (Pin 9). This R/C will completely eliminate any switching transient. Wideband Noise The wideband noise of the filter is the total RMS value of the device’s noise spectral density and it is used to determine the operating signal-to-noise ratio. Most of its frequency contents lie within the filter passband and it cannot be reduced with post filtering. For instance, the LTC1164-5 wideband noise at ±2.5V supply is 100µVRMS, 95 µVRMS of which have frequency contents from DC up to the filter’s cutoff frequency. The total wideband noise ( µRMS)isnearlyindependentofthevalueoftheclock.The clock feedthrough specifications are not part of the wide- band noise. Speed Limitations The LTC1164-5 optimizes AC performance versus power consumption. To avoid op amp slew rate limiting at maximum clock frequencies, the signal amplitude should be kept below a specified level as shown in Table 3. Table 3. Maximum VIN vs VS and fCLK POWER SUPPLY MAXIMUM fCLK MAXIMUM VIN VS = ±7.5V 1.5MHz 1VRMS (fIN > 35kHz) 0.5VRMS (fIN > 250kHz) VS = ±7.5V 1.0MHz 3VRMS (fIN > 25kHz) 0.7VRMS (fIN > 250kHz) VS = ±5.0V 1.0MHz 2.5VRMS (fIN > 25kHz) 0.5VRMS (fIN > 100kHz) Single 5V 1.0MHz 0.7VRMS (fIN > 25kHz) 0.5VRMS (fIN > 100kHz) |
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Similar Description - LTC1164-5_15 |
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