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LTC1414 데이터시트(PDF) 9 Page - Linear Technology |
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LTC1414 데이터시트(HTML) 9 Page - Linear Technology |
9 / 20 page 9 LTC1414 APPLICATIONS INFORMATION IMD f f amplitude at f f amplitude at f ab ab a ± ()= ± () 20log The full-linear bandwidth is the input frequency at which the S/(N + D) has dropped to 74dB (12 effective bits). The LTC1414 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) becomes dominated by distortion at frequencies far be- yond Nyquist. Driving the Analog Input The differential analog inputs of the LTC1414 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 capacitors at the end of conversion. During conversion, the analog inputs draw only a small leakage current. If the source impedance of the driving circuit is low then the LTC1414 inputs can be driven directly. As source impedance increases so will acquisition time (see Figure 6). For minimum acquisition time, with high source impedance, a buffer amplifier should be used. The only requirement is that the amplifier driving the analog input(s) must settle after the small current spike before the next conversion starts (settling time must be 70ns for full throughput rate). 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 dB 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. FREQUENCY (kHz) 0 400 800 200 600 1000 1414 F05a 0 –20 –40 –60 –80 –100 –120 fSAMPLE = 2.2MHz fIN1 = 80.566kHz fIN2 = 97.753kHz FREQUENCY (kHz) 0 400 800 200 600 1000 1414 F05b 0 –20 –40 –60 –80 –100 –120 fSAMPLE = 2.2MHz fIN1 = 970.019kHz fIN2 = 1.492MHz Figure 6. Acquisition Time vs Source Resistance SOURCE RESISTANCE ( Ω) 10 0.01 0.1 1 10 100 1k 1414 FO6 10k 100k Figure 5a. Intermodulation Distortion Plot with Inputs at 80kHz and 97kHz Figure 5b. Intermodulation Distortion Plot with Input Signals of 1MHz and 1.5MHz |
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