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SMP04GBC Datasheet(PDF) 9 Page - Analog Devices |
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SMP04GBC Datasheet(HTML) 9 Page - Analog Devices |
9 / 15 page SMP04 –9– REV. D Sample-Mode Distortion Characteristics Although designed as a sample-and-hold, the SMP04 may be used as a straight buffer amplifier by configuring it in a continu- ous sample mode. This is done by connecting the S/H control pin to a logic LOW. Its buffer bandwidth is primarily limited by the distortion content as the signal frequency increases. Figure 17 shows the distortion characteristics of the SMP04 versus frequency. It maintains less than 1% total harmonic distortion over a voiceband of 8 kHz. Output spot noise voltage measures 4 nV/ √Hz at f = 1 kHz. FREQUENCY – Hz 10 20 100k 1 100 1k 10k 0.1 0.010 0.001 0.0005 200k VS = 6V VIN = 4Vp-p Figure 17. THD+N vs. Frequency Sampled Data Dynamic Performance In continuous sampled data applications such as voice digitiza- tion or communication circuits, it is important to analyze the spectral response of a sample-and-hold. Figures 16a and 16b show the SMP04 sampling at a frequency of 86 kHz with a 1.4 V p-p pure sine wave input of 20 kHz and 8 kHz respec- tively. The photos include the sampling carrier frequency as well as its multiplying frequencies. In the case of the 20 kHz carrier frequency, the second harmonic measures 41 dB down from the fundamental, because the second is dominant, the signal-to-noise ratio is –40.9 dB. The 8 kHz case produces an improved S/N performance of –48 dB. In the V.32 and V.33 modem environment, where a 1.8 kHz carrier signal frequency is applied to the SMP04, Figure 18 compares the spectral responses of the SMP04 under three different sampling frequencies of 14.4 kHz, 9.6 kHz and 7.2 kHz. The signal-to-noise ratios measure 58.2 dB, 59.3 dB and 60 dB respectively. Figure 19 depicts SMP04’s spectral response operating with voice frequency of 3 kHz sampling at a 15.7 kHz rate. Under this condition, the signal-to-noise measures 53 dB. 10 dB/DIV RANGE 15.0 dBm 5.9 dBm START 1 000.0 Hz STOP 20 000.0 Hz Figure 19. SMP04 Spectral Response with an Input Carrier Frequency of 3 kHz and the Sampling Frequency of 15.7 kHz Sampled Data Dynamic Performance In continuous sampled data applications such as voice digitiza- tion or communication circuits, it is important to analyze the spectral response of a sample-and-hold. Figures 16a and 16b show the SMP04 sampling at a frequency of 86 kHz with a 1.4 V p-p pure sine wave input of 20 kHz and 8 kHz respec- tively. The photos include the sampling carrier frequency as well as its multiplying frequencies. In the case of the 20 kHz carrier frequency, the second harmonic measures 41 dB down from the fundamental, because the second is dominant, the signal-to- noise ratio is –40.9 dB. The 8 kHz case produces an improved S/N performance of –48 dB. In the V.32 and V.33 modem environment, where a 1.8 kHz carrier signal frequency is applied to the SMP04, Figure 18 compares the spectral responses of the SMP04 under three different sampling frequencies of 14.4 kHz, 9.6 kHz and 7.2 kHz. The signal-to-noise ratios measure 58.2 dB, 59.3 dB and 60 dB respectively. Figure 18. SMP04 Spectral Response with a 1.8 kHz Carrier Frequency. (a) Shows the Sampling Frequency at 14.4 kHz; it Exhibits a S/N Ratio of 58.2 dB. (b) Shows a 59.3 dB S/N at a Sampling Frequency of 8.6 kHz. (c) Shows a 60 dB S/N at 7.2 kHz. 10 dB/DIV RANGE 15.0 dBm 5.9 dBm CENTER 10 500.0 Hz SPAN 19 000.0 Hz a. 10 dB/DIV RANGE 15.0 dBm 5.2 dBm START 1 000.0 Hz STOP 12 000.0 Hz c. 10 dB/DIV RANGE 15.0 dBm 5.7 dBm START 1 000.0 Hz STOP 12 000.0 Hz b. |
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