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ADS5444-SP Datasheet(PDF) 11 Page - Texas Instruments |
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ADS5444-SP Datasheet(HTML) 11 Page - Texas Instruments |
11 / 22 page THD + 10log10 P S P D SINAD + 10log10 P S P N ) P D SNR + 10log10 P S P N ADS5444-SP www.ti.com SGLS391C – MARCH 2008 – REVISED JANUARY 2014 DEFINITION OF SPECIFICATIONS (continued) Offset Error Offset error is the deviation of output code from mid-code when both inputs are tied to common- mode. Temperature Drift Temperature drift (with respect to gain error and offset error) specifies the change from the value at the nominal temperature to the value at TMIN or TMAX. It is computed as the maximum variation the parameters over the whole temperature range divided by TMIN – TMAX. Signal-to-Noise Ratio (SNR) SNR is the ratio of the power of the fundamental (PS) to the noise floor power (PN), excluding the power at dc and the first five harmonics. (1) SNR is either given in units of dBc (dB to carrier) when the absolute power of the fundamental is used as the reference, or dBFS (dB to full scale) when the power of the fundamental is extrapolated to the converter’s full-scale range. Signal-to-Noise and Distortion (SINAD) SINAD is the ratio of the power of the fundamental (PS) to the power of all the other spectral components including noise (PN) and distortion (PD), but excluding dc. (2) SINAD is either given in units of dBc (dB to carrier) when the absolute power of the fundamental is used as the reference, or dBFS (dB to full scale) when the power of the fundamental is extrapolated to the converter’s full-scale range. Effective Resolution Bandwidth The highest input frequency where the SNR (dB) is dropped by 3 dB for a full- scale input amplitude. Total Harmonic Distortion (THD) THD is the ratio of the power of the fundamental (PS) to the power of the first five harmonics (PD). (3) THD is typically given in units of dBc (dB to carrier). Two-Tone Intermodulation Distortion IMD3 is the ratio of the power of the fundamental (at frequencies f1, f2) to the power of the worst spectral component at either frequency 2f1 – f2 or 2f2 – f1). IMD3 is either given in units of dBc (dB to carrier) when the absolute power of the fundamental is used as the reference or dBFS (dB to full scale) when the power of the fundamental is extrapolated to the converter’s full-scale range. Copyright © 2008–2014, Texas Instruments Incorporated Submit Documentation Feedback 11 |
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