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LTC1419ACSW Datasheet(PDF) 8 Page - Linear Technology |
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LTC1419ACSW Datasheet(HTML) 8 Page - Linear Technology |
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8 / 20 page  8 LTC1419 APPLICATIONS INFORMATION frequencies outside the fundamental. Figure 2 shows a typical LTC1419 FFT plot. 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 LTC1419 maintains near ideal ENOBs up to the Nyquist input frequency of 400kHz (refer to Figure 3). FREQUENCY (kHz) 0 –60 –40 –20 300 1419 F02a –80 –100 100 200 400 250 50 150 350 –120 –140 0 fSAMPLE = 800kHz fIN = 99.804687kHz SFDR = 98dB THD = – 93.3dB Figure 2a. LTC1419 Nonaveraged, 4096 Point FFT, Input Frequency = 100kHz FREQUENCY (kHz) 0 –60 –40 –20 300 1419 F02b –80 –100 100 200 400 250 50 150 350 –120 –140 0 fSAMPLE = 800kHz fIN = 375kHz SFDR = 88.3dB SINAD = 80.1 Figure 2b. LTC1419 Nonaveraged, 4096 Point FFT, Input Frequency = 375kHz 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. 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: THD Log VV V Vn V = +++… 20 23 4 1 222 2 where V1 is the RMS amplitude of the fundamental fre- quency and V2 through Vn are the amplitudes of the second through nth harmonics. THD vs Input Frequency is shown in Figure 4. The LTC1419 has good distortion performance up to the Nyquist frequency and beyond. INPUT FREQUENCY (Hz) 10k 100k 1M 2M 1419 TA02 1k 14 13 12 11 10 9 8 7 6 5 4 3 2 86 80 74 68 62 fSAMPLE = 800kHz Figure 3. Effective Bits and Signal/(Noise + Distortion) vs Input Frequency |
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