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ADS5440 Datasheet(PDF) 8 Page - Texas Instruments |
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ADS5440 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 29 page www.ti.com DEFINITION OF SPECIFICATIONS SNR + 10log10 P S P N (1) SINAD + 10log10 P S P N ) P D (2) ADS5440 SLAS467A – JULY 2005 – REVISED DECEMBER 2005 DEVICE INFORMATION (continued) TERMINAL FUNCTIONS (continued) TERMINAL DESCRIPTION NAME NO. Over range indicator LVDS output. A logic high signals an analog input in excess of the OVR, OVR 42, 41 full-scale range. D0, D0 50, 49 LVDS digital output pair, least-significant bit (LSB) D1–D6, D1–D6 53–64 LVDS digital output pairs D7–D11, D7–D11 67–76 LVDS digital output pairs D12, D12 78, 77 LVDS digital output pair, most-significant bit (MSB) DRY, DRY 80, 79 Data ready LVDS output pair NC 4, 5, 29, 33, 43–48 No connect Analog Bandwidth The analog input frequency at which the power of the fundamental is reduced by 3 dB with respect to the low frequency value. Aperture Delay The delay in time between the rising edge of the input sampling clock and the actual time at which the sampling occurs. Aperture Uncertainty (Jitter) The sample-to-sample variation in aperture delay. Clock Pulse Width/Duty Cycle The duty cycle of a clock signal is the ratio of the time the clock signal remains at a logic high (clock pulse width) to the period of the clock signal. Duty cycle is typically expressed as a percentage. A perfect differential sine wave clock results in a 50% duty cycle. Maximum Conversion Rate The maximum sampling rate at which certified operation is given. All parametric testing is performed at this sampling rate unless otherwise noted. Minimum Conversion Rate The minimum sampling rate at which the ADC functions. Differential Nonlinearity (DNL) An ideal ADC exhibits code transitions at analog input values spaced exactly 1 LSB apart. The DNL is the deviation of any single step from this ideal value, measured in units of LSB. Integral Nonlinearity (INL) The INL is the deviation of the ADCs transfer function from a best fit line determined by a least squares curve fit of that transfer function. The INL at each analog input value is the difference between the actual transfer function and this best fit line, measured in units of LSB. Gain Error The gain error is the deviation of the ADCs actual input full-scale range from its ideal value. The gain error is given as a percentage of the ideal input full-scale range. 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. 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. 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. 8 Submit Documentation Feedback |
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