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AD7771BCPZ датащи(PDF) 23 Page - Analog Devices |
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AD7771BCPZ датащи(HTML) 23 Page - Analog Devices |
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23 / 99 page ![]() AD7771 Data Sheet Rev. 0 | Page 22 of 98 FREQUENCY (Hz) 10 –180 –170 –160 –150 –140 –130 –120 –110 –100 –90 –80 –70 –60 –50 –40 –30 –20 –10 GAIN = 1 GAIN = 2 GAIN = 4 GAIN = 8 TA = 25°C VREF = 2.5V VCM = (AVDD1x + AVSSx) ÷ 2 ODR = 128kSPS INPUT FREQUENCY = 1kHz 0 Figure 38. FFT Plot, High Resolution Mode at 128 kSPS, Input Frequency (fIN) = 1 kHz, Sinc5 Filter Enabled –100 –105 –110 –115 –120 –125 –130 INPUT FREQUENCY (Hz) GAIN = 1 GAIN = 2 GAIN = 4 GAIN = 8 TA = 25°C GAIN = 1 VREF = 2.5V VCM = (AVDD1x + AVSSx) ÷ 2 VIN = –0.5dBFS Figure 39. THD vs. Input Frequency at 64 kSPS, High Resolution Mode, Sinc5 Filter Enabled –100 –135 INPUT FREQUENCY (Hz) –130 –125 –120 –115 –110 –105 GAIN = 1 GAIN = 2 GAIN = 4 GAIN = 8 TA = 25°C VREF = 2.5V VIN = –0.5dBFS Figure 40. THD vs. Input Frequency at 16 kSPS, High Resolution Mode, Sinc3 Filter Enabled 10 –180 FREQUENCY (Hz) –170 –160 –150 –140 –130 –120 –110 –100 –90 –80 –70 –60 –50 –40 –30 –20 –10 0 GAIN = 1 GAIN = 2 GAIN = 4 GAIN = 8 TA = 25°C VREF = 2.5V VCM = (AVDD1x + AVSSx) ÷ 2 ODR = 32kSPS INPUT FREQUENCY = 1kHz Figure 41. FFT Plot, Low Power Mode at 32 kSPS, Input Frequency (fIN) = 1 kHz, Sinc5 Filter Enabled –100 –125 INPUT FREQUENCY (Hz) GAIN = 1 GAIN = 2 GAIN = 4 GAIN = 8 TA = 25°C VREF = 2.5V VIN = –0.5dBFS –120 –115 –110 –105 Figure 42. THD vs. Input Frequency at 16 kSPS, Low Power Mode, Sinc5 Filter Enabled –100 –135 INPUT FREQUENCY (Hz) –130 –125 –120 –115 –110 –105 GAIN = 1 GAIN = 2 GAIN = 4 GAIN = 8 TA = 25°C VREF = 2.5V VIN = –0.5dBFS Figure 43. THD vs. Input Frequency at 4 kSPS, Low Power Mode, Sinc3 Filter Enabled |
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