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LTC2361CTS8-TRPBF Datasheet(PDF) 11 Page - Linear Technology |
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LTC2361CTS8-TRPBF Datasheet(HTML) 11 Page - Linear Technology |
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11 / 20 page  LTC2360/LTC2361/LTC2362 11 236012f APPLICATIONS INFORMATION DC PERFORMANCE The noise of an ADC can be evaluated in two ways: sig- nal-to-noise ratio (SNR) in the frequency domain and histogram in the time domain. The LTC2360/LTC2361/ LTC2362 excel in both. Figure 5 demonstrates that the LTC2360/LTC2361/LTC2362 have an SNR of over 73dB. The noise in the time domain histogram is the transition noise associated with a 12-bit resolution ADC which can be measured with a fixed DC signal applied to the input of the ADC. The resulting output codes are collected over a large number of conversions. The shape of the distribu- tion of codes will give an indication of the magnitude of the transition noise. In Figure 4, the distribution of output codes is shown for a DC input that has been digitized 16384 times. The distribution is Gaussian and the RMS code transition is about 0.32LSB. This corresponds to a noise level of 73dB relative to a full scale of 3V. DYNAMIC PERFORMANCE The LTC2360/LTC2361/LTC2362 have excellent high speed sampling capability. Fast fourier transform (FFT) test techniques are used to test the ADCs’ frequency response, distortion and noise at the rated throughput. By applying a low distortion sine wave and analyzing the digital output using an FFT algorithm, the ADCs’ spectral content can be examined for frequencies outside the fundamental. Figures 5 and 6 show typical LTC2361 and LTC2362 FFT plots respectively. Figure 4. Histogram for 16384 Conversions Figure 5. LTC2361 FFT Plot Figure 6. LTC2362 FFT Plot INPUT FREQUENCY (kHz) 0 0 –20 –60 –100 –40 –80 –120 –140 50 100 236012 F05 125 25 75 VDD = 3V fSMPL = 250ksps fIN = 124kHz SINAD = 73dB THD = –84dB INPUT FREQUENCY (kHz) 0 0 –20 –60 –100 –40 –80 –120 –140 100 200 236012 F06 250 50 150 VDD = 3V fSMPL = 500ksps fIN = 248kHz SINAD = 73dB THD = –81dB CODE 10000 8000 4000 6000 2000 0 2047 2045 2049 236012 F04 2050 2046 2048 VDD = 3V |
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