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LTC1164-6CN Datasheet(PDF) 9 Page - Linear Technology |
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LTC1164-6CN Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LTC1164-6 S APPLICATI 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 (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 LTC1164-6 wideband noise at ±2.5V supply is 100µVRMS, 90 µVRMS of which have frequency contents from DC up to the filter’s cutoff frequency. The total wideband noise ( µVRMS) is nearly independent of the value of the clock. The clock feedthrough specifications are not part of the wideband noise. Speed Limitations The LTC1164-6 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 on Table 4. 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 LTC1164-6 case, an input signal whose frequency is in the range of fCLK ±4%, will be aliased back into the filter’s passband. If, for instance, an LTC1164-6 operating with a 100kHz clock and 1kHz cutoff frequency receives a 98.5kHz, 10mVRMS input signal, a 1.5kHz, 10 µVRMS alias signal will appear at its output. When the LTC1164-6 operates with a clock-to- cutoff frequency of 50:1, aliasing occurs at twice the clock frequency. Table 5 shows details. Table 4. Maximum VIN vs VS and fCLK POWER SUPPLY MAXIMUM fCLK MAXIMUM VIN ±7.5V 1.5MHz 1VRMS (fIN > 35kHz) 1MHz 3VRMS (fIN > 25kHz) ≥1MHz 0.7VRMS (fIN > 250kHz) ±5V 1MHz 2.5VRMS (fIN > 25kHz) 1MHz 0.5VRMS (fIN > 100kHz) Single 5V 1MHz 0.7VRMS (fIN > 25kHz) 1MHz 0.5VRMS (fIN > 100kHz) Table 5. Aliasing (fCLK = 100kHz) INPUT FREQUENCY OUTPUT LEVEL OUTPUT FREQUENCY (VIN = 1VRMS) (Relative to Input) (Aliased Frequency) (kHz) (dB) (kHz) fCLK/fC = 100:1, fCUTOFF = 1kHz 96 (or 104) –75.0 4.0 97 (or 103) – 68.0 3.0 98 (or 102) – 65.0 2.0 98.5 (or 101.5) – 60.0 1.5 99 (or 101) – 3.2 1.0 99.5 (or 100.5) – 0.5 0.5 fCLK/fC = 50:1, fCUTOFF = 2kHz 192 (or 208) – 76.0 8.0 194 (or 206) – 68.0 6.0 196 (or 204) – 63.0 4.0 198 (or 202) – 3.4 2.0 199 (or 201) – 1.3 1.0 199.5(or 200.5) – 0.9 0.5 Table 6. 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 Linear Phase 0.43/fC 0.34/fC 0.85/fC 0 LTC1164-6 Linear Phase 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% |
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