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## LTC1401I Datasheet(PDF) 8 Page - Linear Technology

 Part No. LTC1401I Description Complete SO-8, 12-Bit, 200ksps ADC with Shutdown Download 20 Pages Scroll/Zoom 100% Maker LINER [Linear Technology] Homepage http://www.linear.com Logo

## LTC1401I Datasheet(HTML) 8 Page - Linear Technology

 8 / 20 page 8LTC1401APPLICATIONS INFORMATIONTotal Harmonic DistortionTotal harmonic distortion (THD) is the ratio of the RMSsum of all harmonics of the input signal to the fundamentalitself. The out-of-band harmonics alias into the frequencyband between DC and half of the sampling frequency. THDis expressed as:THD = 20log √V22 + V32 + ...Vn2V1Where V1 is the RMS amplitude of the fundamentalfrequency and V2 through Vn are the amplitudes of thesecond through nth harmonics. THD vs input frequency isshown in Figure 4. The LTC1401 has good distortionperformance up to the Nyquist frequency and beyond.Intermodulation DistortionIf the ADC input signal consists of more than one spectralcomponent, the ADC transfer function nonlinearity canproduce intermodulation distortion (IMD) in addition toTHD. IMD is the change in one sinusoidal input caused bythe presence of another sinusoidal input at a differentfrequency.If two pure sine waves of frequencies fa and fb are appliedto the ADC input, nonlinearities in the ADC transferfunction can create distortion products at sum and differ-FREQUENCY (kHz)0204050709010306080100LTC1400 • F02b0–10–20–30–40–50– 60–70–80–90–100–110–120fSAMPLE = 200kHzfIN = 99.072266kHzSINAD = 65dBTHD = –66dBVCC = 3VTA = 25°CINPUT FREQUENCY (Hz)10k0–10–20–30–40–50–60–70–80–90–100100k1MLTC1401 • F042ND HARMONICTHD3RD HARMONICTA = 25°CfSAMPLE = 200kHzFigure 4. Distortion vs Input FrequencyFigure 2b. LTC1401 Nonaveraged, 4096 Point FFTPlot with 100kHz Input FrequencyEffective Number of BitsThe effective number of bits (ENOBs) is a measurement ofthe effective resolution of an ADC and is directly related tothe S/(N + D) by the equation:NSN D=+()/– ..176602where N is the effective number of bits of resolution andS/(N + D) is expressed in dB. Figure 3 shows ENOBs vsInput Frequency.Figure 3. Effective Bits and Signal-to-Noise +Distortion vs Input FrequencyINPUT FREQUENCY (Hz)10k12111098765432107468625650100k1MLTC1401 • F03TA = 25°CfSAMPLE = 200kHz

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