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THS1050 Datasheet(PDF) 6 Page - Texas Instruments |
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THS1050 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 20 page THS1050 10-BIT 50 MSPS IF SAMPLING COMMUNICATIONS ANALOG-TO-DIGITAL CONVERTER SLAS278 – APRIL 2000 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 definitions of specifications analog bandwidth The analog input frequency at which the spectral power of the fundamental frequency of a large input signal is reduced by 3 dB. aperture delay The delay between the 50% point of the rising edge of the clock and the instant at which the analog input is sampled. aperture uncertainity (jitter) The sample-to-sample variation in aperture delay differential nonlinearity The average deviation of any output code from the ideal width of 1 LSB. clock pulse width/duty cycle Pulse width high is the minimum amount of time that the clock pulse should be left in logic 1 state to achieve rated performance; pulse width low is the minimum time clock pulse should be left in low state. At a given clock rate, these specs define acceptable clock duty cycles. offset error The difference between the analog input voltage at which the analog-to-digital converter output changes from negative full scale, to one LSB above negative full scale, and the ideal voltage at which this transition should occur. gain error The maximum error in LSBs between a digitized ideal full scale low frequency offset corrected triangle wave analog input, from the ideal digitized full scale triangle wave, divided by the full scale range, in this case 1024. harmonic distortion The ratio of the power of the fundamental to a given harmonic component reported in dBc. integral nonlinearity The deviation of the transfer function from an end-point adjusted reference line measured in fractions of 1 LSB. Also the integral of the DNL curve. output delay The delay between the 50% point of the falling edge of the clock and signal and the time when all output data bits are within valid logic levels (not including pipeline delay). signal-to-noise-and distortion (SINAD) When tested with a single tone, the ratio of the signal power to the sum of the power of all other spectral components, excluding dc, referenced to full scale. signal-to-noise ratio (SNR) When tested with a single tone, the ratio of the signal power to the sum of the power of all other power spectral components, excluding dc and the first 9 harmonics, referenced to full scale. effective number of bits (ENOB) For a sine wave, SINAD can be expressed in terms of the effective number of bits, using the following formula, ENOB + (SINAD * 1.76) 6.02 spurious-free dynamic range (SFDR) The ratio of the signal power to the power of the worst spur, excluding dc. The worst spurious component may or may not be a harmonic. The ratio is reported in dBc (that is, degrades as signal levels are lowered). |
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