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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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AD7716BP Fiches technique(PDF) 8 Page - Analog Devices |
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AD7716BP Fiches technique(HTML) 8 Page - Analog Devices |
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8 / 16 page  REV. A AD7716 –8– OUTPUT UPDATE RATE This is the rate at which the digital filter updates the output shift register. It is a function of the master clock frequency and the programmed filter cutoff frequency. FILTER CUTOFF FREQUENCY The digital filter of the AD7716 can be programmed, in binary steps, to 5 discrete cutoff frequencies, ranging from 584 Hz to 36.5 Hz (for a CLKIN frequency of 8 MHz). SETTLING TIME This is the settling time of the on-chip digital filter, to 0.0007% of FSR, in response to a full-scale step at the input of the ADC. It is proportional to the master clock frequency and the filter cutoff frequency. USABLE DYNAMIC RANGE The usable dynamic range is the ratio of the rms full-scale reading (sine wave input) to the rms noise of the converter, expressed in dBs. It determines the level to which it is possible to resolve the input signal. For example, at a bandwidth of 146 Hz, the rms noise of the converter is 11 µV. The full-scale rms is 1.77 volts. So, the usable dynamic range is 104 dB. Any signal below this level will be indistinguishable from noise unless extra post-filtering techniques are employed. TOTAL HARMONIC DISTORTION Total harmonic distortion (THD) is the ratio of the rms sum of the harmonics to the fundamental. For the AD7716, it is defined as: THD (dB) = 20 log V 2 2 +V 3 2 +V 4 2 +V 5 2 +V 6 2 V 1 where V1 is the rms amplitude of the fundamental and V2, V3, V4, V5 and V6 are the rms amplitudes of the second through sixth harmonics. ABSOLUTE GROUP DELAY Absolute group delay is the rate of change of phase versus fre- quency, d φ/df and is expressed in seconds. For the AD7716, it is dependent on master clock frequency and filter cutoff frequency. DIFFERENTIAL GROUP DELAY Differential group delay is the total variation in absolute group delay in the specified bandwidth. Since the digital filter in the AD7716 has perfectly linear phase, the differential group delay is almost zero. This is important in many signal processing ap- plications where excessive differential group delay can cause phase distortion. TERMINOLOGY LINEARITY ERROR This is the maximum deviation of any code from a straight line passing through the endpoints of the transfer function. The endpoints of the transfer function are zero scale (not to be con- fused with Bipolar Zero), a point 0.5 LSB below the first code transition (000 . . . 000 to 000 . . . 001) and full scale, a point 0.5 LSB above the last code transition (111 . . . 110 to 111 . . . 111). The error is expressed as a percentage of full scale. DIFFERENTIAL LINEARITY ERROR/NO MISSED CODES This is the difference between any code’s actual width and the ideal (1 LSB) width. Differential Linearity Error is expressed in LSBs. A differential linearity specification of ±1 LSB or less guarantees no missed codes to the full resolution of the device. The AD7716 has no missed codes guaranteed to 21 bits with a cutoff frequency of 146 Hz. GAIN ERROR Gain Error is the deviation of the last code transition (111 . . . 110 to 111 . . . 1) from the ideal (VREF –3/2 LSBs). It is expressed as a percentage of full scale. GAIN TC This is the variation of gain error with temperature and is ex- pressed in µV/°C. OFFSET ERROR Offset Error is the deviation of the first code transition from the ideal (–VREF + 0.5 LSB). It is expressed as a percentage of full scale. OFFSET TC This is the variation of offset error with temperature and is ex- pressed in µV/°C. NOISE This is the converter rms noise expressed in µV. Because of the digital filtering in the sigma delta converter, the noise perfor- mance is a function of the programmed filter cutoff. SAMPLING RATE This is the modulator sampling rate. For the AD7716, it is fCLKIN/14. |
Numéro de pièce similaire - AD7716BP |
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Description similaire - AD7716BP |
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