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LTC1410CSW Datasheet(PDF) 9 Page - Linear Technology |
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LTC1410CSW Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  9 LTC1410 APPLICATIONS INFORMATION 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 LTC1410 has good distortion performance up to the Nyquist frequency and beyond. FREQUENCY (MHz) 0 0 –20 –40 –60 –80 –100 –120 100 (fb–fa) (fa+fb) (2fa+fb) (fa+2fb) (fa) (2fa) (fb) (2fb–fa) 200 300 400 1410 F05 500 600 (2fb) fSAMPLE = 1.25MHz fIN1 = 88.19580078kHz fIN2 = 111.9995117kHz (2fa–fb) (3fa) (3fb) Figure 5. Intermodulation Distortion Plot Peak Harmonic or Spurious Noise The peak harmonic or spurious noise is the largest spec- tral component excluding the input signal and DC. This value is expressed in decibel relative to the RMS value of a full-scale input signal. Full Power and Full Linear Bandwidth The full power bandwidth is that input frequency at which the amplitude of the reconstructed fundamental is re- duced by 3dB for a full-scale input signal. The full linear bandwidth is the input frequency at which the S/(N + D) has dropped to 68dB (11 effective bits). The LTC1410 has been designed to optimize input bandwidth, allowing the ADC to undersample input signals with fre- quencies above the converter’s Nyquist frequency. The noise floor stays very low at high frequencies; S/(N + D) does not become dominated by distortion until frequen- cies far beyond Nyquist. Driving the Analog Input The differential analog inputs of the LTC1410 are easy to drive. The inputs may be driven differentially or as a single-ended input (i.e., the – AIN input is grounded). The +AIN and – AIN inputs are sampled at the same instant. Any unwanted signal that is common mode to both inputs will be reduced by the common mode rejection of the sample-and-hold circuit. The inputs draw only one small current spike while charging the sample-and-hold INPUT FREQUENCY (Hz) 1k 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 10k 100k 1410 G03 1M 10M THD 2ND 3RD Figure 4. Distortion vs Input Frequency Intermodulation Distortion (IMD) If the ADC input signal consists of more than one spectral component, the ADC transfer function nonlinearity can produce Intermodulation Distortion in addition to THD. IMD is the change in one sinusoidal input caused by the presence of another sinusoidal input at a different frequency. If two pure sine waves of frequencies fa and fb are applied to the ADC input, nonlinearities in the ADC transfer func- tion can create distortion products at the sum and differ- ence frequencies of mfa ± nfb, where m and n = 0, 1, 2, 3, etc. For example, the 2nd order IMD terms include (fa + fb). If the two input sine waves are equal in magnitude, the value (in decibels) of the 2nd order IMD products can be expressed by the following formula: IMD f f f Amplitude at ab b + ()= ± () 20 log Amplitude at f f a a |
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