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AD7845BR Arkusz danych(PDF) 4 Page - Analog Devices |
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AD7845BR Arkusz danych(HTML) 4 Page - Analog Devices |
4 / 12 page AD7845 REV. B –4– PIN CONFIGURATIONS LCC PLCC DIP, SOIC DIGITAL-TO-ANALOG GLITCH IMPULSE This is the amount of charge injected from the digital inputs to the analog output when the inputs change state. This is nor- mally specified as the area of the glitch in either pA-secs or nV-secs depending upon whether the glitch is measured as a current or voltage. The measurement takes place with VREF = AGND. DIGITAL FEEDTHROUGH When the DAC is not selected (i.e., CS is high) high frequency logic activity on the device digital inputs is capacitively coupled through the device to show up as noise on the VOUT pin. This noise is digital feedthrough. MULTIPLYING FEEDTHROUGH ERROR This is ac error due to capacitive feedthrough from the VREF terminal to VOUT when the DAC is loaded with all 0s. OPEN-LOOP GAIN Open-loop gain is defined as the ratio of a change of output voltage to the voltage applied at the VREF pin with all 1s loaded in the DAC. It is specified at dc. UNITY GAIN SMALL SIGNAL BANDWIDTH This is the frequency at which the magnitude of the small signal voltage gain of the output amplifier is 3 dB below unity. The device is operated as a closed-loop unity gain inverter (i.e., DAC is loaded with all 1s). OUTPUT RESISTANCE This is the effective output source resistance. FULL POWER BANDWIDTH Full power bandwidth is specified as the maximum frequency, at unity closed-loop gain, for which a sinusoidal input signal will produce full output at rated load without exceeding a distortion level of 3%. TERMINOLOGY LEAST SIGNIFICANT BIT This is the analog weighting of 1 bit of the digital word in a DAC. For the AD7845, 1 LSB = V REF 2 12 . RELATIVE ACCURACY Relative accuracy or endpoint nonlinearity is a measure of the maximum deviation from a straight line passing through the endpoints of the DAC transfer function. It is measured after adjusting for both endpoints (i.e., offset and gain error are ad- justed out) and is normally expressed in least significant bits or as a percentage of full-scale range. DIFFERENTIAL NONLINEARITY Differential nonlinearity is the difference between the measured change and the ideal 1 LSB change between any two adjacent codes. A specified differential nonlinearity of +1 LSB max over the operating temperature range ensures monotonicity. GAIN ERROR Gain error is a measure of the output error between an ideal DAC and the actual device output with all 1s loaded after offset error has been adjusted out. Gain error is adjustable to zero with an external potentiometer. See Figure 13. ZERO CODE OFFSET ERROR This is the error present at the device output with all 0s loaded in the DAC. It is due to the op amp input offset voltage and bias current and the DAC leakage current. TOTAL HARMONIC DISTORTION This is the ratio of the root-mean-square (rms) sum of the har- monics to the fundamental, expressed in dBs. OUTPUT NOISE This is the noise due to the white noise of the DAC and the input noise of the amplifier. |
Podobny numer części - AD7845BR |
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Podobny opis - AD7845BR |
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