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AD7564BN Scheda tecnica(PDF) 8 Page - Analog Devices |
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AD7564BN Scheda tecnica(HTML) 8 Page - Analog Devices |
8 / 17 page REV. AD7564 –8– Table II. DAC Selection DS1 DS0 Function 0 0 DAC A Selected 0 1 DAC B Selected 1 0 DAC C Selected 1 1 DAC D Selected Output Voltage Settling Time This is the amount of time it takes for the output to settle to a specified level for a full-scale input change. For the AD7564, it is specified with the AD843 as the output op amp. Digital to Analog Glitch Impulse This is the amount of charge injected into the analog output when the inputs change state. It is normally 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 signal. It is measured with the reference input connected to AGND and the digital inputs toggled between all 1s and all 0s. AC Feedthrough Error This is the error due to capacitive feedthrough from the DAC reference input to the DAC IOUT terminal, when all 0s are loaded in the DAC. Channel-to-Channel Isolation Channel-to-channel isolation refers to the proportion of input signal from one DAC’s reference input which appears at the output of any other DAC in the device and is expressed in dBs. Digital Crosstalk The glitch impulse transferred to the output of one converter due to a change in digital input code to the other converter is defined as the Digital Crosstalk and is specified in nV-secs. Digital Feedthrough When the device is not selected, high frequency logic activity on the device digital inputs is capacitively coupled through the de- vice to show up at on the IOUT pin and subsequently on the op amp output. This noise is digital feedthrough. TERMINOLOGY Relative Accuracy Relative accuracy or endpoint linearity is a measure of the maximum deviation from a straight line passing through the endpoints of the DAC transfer function. It is measured after ad- justing for zero error and full-scale error and is normally ex- pressed in Least Significant Bits or as a percentage of full-scale reading. 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 maximum ensures monotonicity. Gain Error Gain error is a measure of the output error between an ideal DAC and the actual device output. It is measured with all 1s in the DAC after offset error has been adjusted out and is ex- pressed in Least Significant Bits. Gain error is adjustable to zero with an external potentiometer. Output Leakage Current Output leakage current is current which flows in the DAC ladder switches when these are turned off. For the IOUT1 terminal, it can be measured by loading all 0s to the DAC and be measured by loading all 0s to the DAC and measuring the IOUT1 current. Minimum current will flow in the IOUT2 line when the DAC is loaded with all 1s. This is a combination of the switch leakage current and the ladder termination resistor current. The IOUT2 leakage current is typically equal to that in IOUT1. Output Capacitance This is the capacitance from the IOUT1 pin to AGND. Table I. AD7564 Loading Sequence DB15 DB0 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 A1 A0 DS1 DS0 B |
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