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AD7896BN Datenblatt(PDF) 11 Page - Analog Devices |
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AD7896BN Datenblatt(HTML) 11 Page - Analog Devices |
11 / 12 page AD7896 REV. B –11– Dynamic Performance (Mode 1 Only) With a combined conversion and acquisition time of 9.5 µs, the AD7896 is ideal for wide bandwidth signal processing applica- tions. These applications require information on the ADC’s ef- fect on the spectral content of the input signal. Signal to (Noise + Distortion), Total Harmonic Distortion, Peak Harmonic or Spurious Noise and Intermodulation Distortion are all specified. Figure 11 shows a typical FFT plot of a 10 kHz, 0 V to +3.3 V input after being digitized by the AD7896 operating at a 102.4 kHz sampling rate. The Signal to (Noise + Distortion) Ratio is 71.5 dB and the Total Harmonic Distortion is –83 dB. –0 –120 51200 –60 –100 10240 –80 0 –20 –40 40960 30720 20480 F SAMPLE = 102.4 kHz F IN = 10kHz SNR = 71.54dB THD = –82.43dB FREQUENCY – Hz Figure 11. AD7896 FFT Plot Effective Number of Bits The formula for Signal to (Noise + Distortion) Ratio (See Ter- minology section) is related to the resolution or number of bits in the converter. Rewriting the formula, below, gives a measure of performance expressed in effective number of bits (N): N = (SNR 1.76)/6.02 where SNR is Signal to (Noise + Distortion) Ratio. The effective number of bits for a device can be calculated from its measured Signal to (Noise + Distortion) Ratio. Figure 12 shows a typical plot of effective number of bits versus frequency for the AD7896 from dc to fSAMPLING/2. The sampling fre- quency is 102.4 kHz. The plot shows that the AD7896 converts an input sine wave of 51.2 kHz to an effective numbers of bits of 11.25 which equates to a Signal to (Noise + Distortion) level of 69 dB. 12.00 0 51.2 25.6 11.75 11.50 11.25 11.00 INPUT FREQUENCY – kHz Figure 12. Effective Number of Bits vs. Frequency Power Considerations In the automatic power-down mode then the part may be oper- ated at a sample rate which is considerably less than 100 kHz. In this case the power consumption will be reduced and will de- pend on the sample rate. Figure 13 shows a graph of the power consumption versus sampling rates from 10 Hz to 1 kHz in the automatic power-down mode. The conditions are 2.7 V supply 25 °C, serial clock frequency of 8.33 MHz and the data was read after conversion. 200 0 1000 120 40 100 80 10 160 SAMPLING RATE IN Hz F SCLK = 8.33 MHz Figure 13. Power vs. Sample Rate in Auto Power-Down Mode |
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