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AS1419AECA-IT Datasheet(PDF) 9 Page - Austin Semiconductor |
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AS1419AECA-IT Datasheet(HTML) 9 Page - Austin Semiconductor |
9 / 20 page ADC ADC ADC ADC ADC AS1419 AS1419A AS1419 & AS1419A Rev. 1.5 08/09 Austin Semiconductor, Inc. reserves the right to change products or specifications without notice. 9 Austin Semiconductor, Inc. Signal-to-Noise Ratio The signal-to-noise plus distortion ratio [S/(N + D)] is the ratio between the RMS amplitude of the fundamental input frequency to the RMS amplitude of all other frequency components at the A/D output. The output is band limited to frequencies from above DC and below half the sampling frequency. Figure 2 shows a typical spectral content with a 800kHz sampling rate and a 100kHz input. The dynamic performance is excellent for input frequencies up to and beyond the Nyquist limit of 400kHz. Effective Number of Bits The effective number of bits (ENOBs) is a measurement of the resolution of an ADC and is directly related to the S/(N + D) by the equation: N = [S/(N + D) – 1.76]/6.02 where N is the effective number of bits of resolution and S/(N + D) is expressed in dB. At the maximum sampling rate of 800kHz, the AS1419 maintains near ideal ENOBs up to the Nyquist input frequency of 400kHz (refer to Figure 3). FIGURE 3: Effective Bits and Signal/ (Noise+Distortion) vs. Input Frequency Total Harmonic Distortion Total harmonic distortion (THD) is the ratio of the RMS sum of all harmonics of the input signal to the fundamental itself. The out-of-band harmonics alias into the frequency band between DC and half the sampling frequency. THD is expressed as: where V1 is the RMS amplitude of the fundamental frequency and V2 through Vn are the amplitudes of the second through nth harmonics. THD vs Input Frequency is shown in Figure 4. The AS1419 has good distortion performance up to the Nyquist frequency and beyond. FIGURE 4: Distortion vs. Input Frequency FIGURE 5: Intermodulation Distortion Plot |
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