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AD7894BR-10 Datasheet(PDF) 11 Page - Analog Devices |
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AD7894BR-10 Datasheet(HTML) 11 Page - Analog Devices |
11 / 12 page AD7894 –11– REV. 0 Dynamic Performance (Mode 1 Only) With a conversion time of 5 µs, the AD7894 is ideal for wide bandwidth signal processing applications. These applications require information on the ADC’s effect on the spectral con- tent 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, ±10 V input after being digitized by the AD7894-10 operating at a 160 kHz sampling rate. The signal to (noise + distortion) ratio is 80.24 dB and the total harmonic distortion is –96.35 dB. 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 mea- sure of performance expressed in effective number of bits (N): N = (SNR –1.76) 6.02 where SNR is Signal to (Noise + Distortion) Ratio. FREQUENCY – kHz 0 –140 080 10 20 30 40 50 60 70 –20 –60 –80 –100 –120 –40 fS = 160kHz FIN = 10kHz SNR = 80.24dB THD = –96.35dB Figure 11. AD7894 FFT Plot 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 AD7894 from dc to fSAMPLING/2. The sampling fre- quency is 160 kHz. The plot shows that the AD7894 converts an input sine wave of 10 kHz to an effective numbers of bits of 13.00, which equates to a signal to (noise + distortion) level of 80.02 dB. FREQUENCY – kHz 14 13 9 10 1000 100 12 11 10 Figure 12. Effective Number of Bits vs. Frequency Power Considerations In the automatic power-down mode the part may be operated at a sample rate that is considerably less than 160 kHz. In this case, the power consumption will be reduced and will depend on the sample rate. Figure 13 shows a graph of the power con- sumption versus sampling rates from 1 Hz to 100 kHz in the automatic power-down mode. The conditions are 5 V supply +25 °C. The SCLK pin was held low and no data was read from the part. SAMPLING FREQUENCY – Hz 100 0.1 1 100000 10 100 1000 10000 10 1 Figure 13. Power vs. Sampling Rate in Automatic Power- Down Mode 82 81 78 –40 80 –20 0 20 40 60 80 79 fS = 160kHz FIN = 10kHz TEMPERATURE – C Figure 14. SNR + D vs. Temperature FREQUENCY – kHz 100 80 10 1000 100 90 70 60 50 40 30 20 10 0 Figure 15. THD vs. Frequency |
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