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AM79C03 Datasheet(PDF) 14 Page - Advanced Micro Devices |
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AM79C03 Datasheet(HTML) 14 Page - Advanced Micro Devices |
14 / 48 page 14 Am79C02/03/031(A) Data Sheet Discrimination against Out-of-Band Input Signals When an out-of-band sine wave signal with frequency f and level A is applied to the analog input, there may be frequency components below 4 kHz at the digital output, caused by the out-of-band signal. These components are at least the specified dB level below the level of a signal at the same output originating from a 1014 Hz sine wave signal with a level of A dBm0 also applied to the analog input. The minimum specifications are shown in Figure 5. Frequency of Out-of-Band Signal Amplitude of Out-of-Band Signal Level below A 16.6 Hz < f < 45 Hz –25 dBm0 < A ≤ 0 dBm0 18 dB 45 Hz < f < 65 Hz –25 dBm0 < A ≤ 0 dBm0 25 dB 65 Hz < f < 100 Hz –25 dBm0 < A ≤ 0 dBm0 10 dB 3400 Hz < f < 4600 Hz –25 dBm0 < A ≤ 0 dBm0 see Figure 5 4600 Hz < f < 100 kHz –25 dBm0 < A ≤ 0 dBm0 32 dB 0 –10 –20 –30 –40 –50 Frequency (kHz) 3.4 4.0 4.6 –32 dB, –25 dBm0 < input < 0 dBm0 DSLAC Device Specification Level (dB) Figure 5. Discrimination against Out-of-Band Signals –28 dBm 09875H-009 Note: The attenuation of the waveform below amplitude A between 3400 Hz and 4600 Hz is given by the formula: Attenuation dB () 14 14 π 4000 f – () 1200 ---------------------------- sin – = |
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