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LTC1065MJ8 Datasheet(PDF) 10 Page - Linear Technology |
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LTC1065MJ8 Datasheet(HTML) 10 Page - Linear Technology |
10 / 16 page 10 LTC1065 1065fb S APPLICATI I FOR ATIO Table 3. CMR Data, fCLK = 100kHz 25 °C POWER SUPPLY ∆VIN –40 °C25°C85°C(VOS Nulled) ±2.5V ±1.8V 84dB 83dB 80dB 83dB ±5V ±4V 82dB 78dB 77dB 78dB ±7.5V ±6V 80dB 77dB 76dB 80dB 2 µs/DIV 1065F08 fCLK = 100kHz, fC = 1kHz, VS = ±5V, 1MHz SCOPE BW Figure 8. LTC1065 Output Clock Feedthrough + Noise 2 µs/DIV 1063 F09 fCLK = 100kHz, fC = 1kHz, VS = ±5V, 1MHz SCOPE BW Figure 9. LTC1065 Output Clock Feedthrough + Noise The above data is valid for clock frequencies up to 800kHz, 900kHz, 1MHz, for VS = ±2.5V, ±5V, ±7.5V respectively. Clock Feedthrough Clock feedthrough is defined as the RMS value of the clock frequency and its harmonics which are present at the filter’s output pin. The clock feedthrough is tested with the filter input grounded and it depends on the quality of the PC board layout and power supply decoupling. Any para- sitic switching transients during the rise and fall of the incoming clock, are not part of the clock feedthrough specifications; their amplitude strongly depends on scope probing techniques as well as ground quality and power supply bypassing. For a power supply VS = ±5V, the clock feedthrough of the LTC1065 is 50 µVRMS; for VS = ±7.5V, the clock feedthrough approaches 75 µVRMS. Figures 8 and 9 show a typical scope photo of the LTC1065 output pin when the input pin is grounded. The filter cutoff frequency was 1kHz, while scope bandwidth was chosen to be 1MHz so that switching transients above the 100kHz clock frequency would show. Wideband Noise The wideband noise data is used to determine the operat- ing signal-to-noise ratio at a given distortion level. The wideband noise ( µVRMS)isnearlyindependentofthevalue of the clock frequency and excludes the clock feedthrough. The LTC1065’s typical wideband noise is 80 µVRMS. Figure 9 shows the same scope photo as Figure 8 but with a more sensitive vertical scale. The clock feedthrough is imbed- ded in the filter’s wideband noise. The peak-to-peak wide- band noise of the filter can be clearly seen; it is approxi- mately 420 µVP-P. Note that 420µVP-P equals the 80µVRMS wideband noise of the part multiplied by a crest factor of 5.25. Aliasing Aliasing is an inherent phenomenon of sampled data filters. It primarily occurs when the frequency of an input signal approaches the sampling frequency. For the LTC1065, an input signal whose frequency is in the range of fCLK ±6% will generate an alias signal into the filter’s passband and stopband. Table 4 shows details. Example: LTC1065, fCLK = 20kHz, fC = 200kHz, fIN = (19.6kHz, 100mVRMS) fALIAS = (400Hz, 3.16mVRMS) |
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