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SMP04 Datasheet(PDF) 8 Page - Analog Devices |
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SMP04 Datasheet(HTML) 8 Page - Analog Devices |
8 / 15 page –8– SMP04 REV. D Optimizing Dynamic Performance of the SMP04 Various operating parameters such as input voltage amplitude, sampling pulsewidth and, as mentioned before, supply bypass- ing and grounding all have an effect on the signal-to-noise ratio. Table I shows the SNR versus input level for the SMP04. Distortion of the SMP04 is reduced by increasing the supply voltage. This has the effect of increasing the positive slew rate. Table II shows data taken at 12.3 kHz sample rate and 2 kHz input frequency. Total harmonic distortion is dominated by the second and third harmonics. FREQUENCY DOMAIN PERFORMANCE The SMP04 has been characterized in the frequency domain for those applications that require capture of dynamic signals. See Figure 16a for typical 86.1 kHz sample rate and an 8 kHz input signal. Typically, the SMP04 can sample at rates up to 85 kHz. In addition to the maximum sample rate, a minimum sample pulsewidth will also be acceptable for a given design. Our testing shows a drop in performance as the sample pulsewidth becomes less than 4 µs. 10 dB/DIV RANGE 15.0 dBm 6.0 dBm START 1 000.0 Hz STOP 100 000.0 Hz a. 10 dB/DIV RANGE 15.0 dBm 6.3 dBm START 1 000.0 Hz STOP 100 000.0 Hz b. Figure 16. Spectral Response at a Sampling Frequency of 86 kHz. Photo (a) Shows a 20 kHz Carrier Frequency and Photo (b) Shows an 8 kHz Frequency. Table III shows the effect of sampling pulsewidth on the SNR of the SMP04. The recommended operating pulsewidth should be a minimum of 5 µs to achieve a good balance between acqui- sition time and SNR for the 1.4 V p-p signal shown. For larger swings the pulsewidth will need to be larger to account for the time required for the signal to slew the additional voltage. This could be used as a method of measuring acquisition time indirectly. Table I. SNR vs. VIN Input Voltage SNR (V p-p) (dB) 1 –61 2 –53 3 –50 4 –47 5 –45 6 –44 Conditions: VS = ± 6 V, fS = 14.4 kHz, fIN = 1.8 kHz, tPW = 10 µs. Table II. SNR vs. Supply Voltage Supply Voltage 2nd 3rd (V) (dB) (dB) 10 –49 –62 12 –55 –71 14 –60 –80 15 –62 <–80 16 –63 <–83 17 –65 <–85 Table III. SNR vs. Sample Pulsewidth Sample Pulsewidth SNR ( s) (dB) 1 –37 2 –44 3 –50 4 –54 5 –54.9 6 –55 7 –55.3 Conditions: VS = ± 6 V, VIN = 1.4 V p-p, fS = 14.4 kHz, fIN = 1.8 kHz. |
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