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AD7943BRS датащи(PDF) 8 Page - Analog Devices |
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AD7943BRS датащи(HTML) 8 Page - Analog Devices |
8 / 16 page AD7943/AD7945/AD7948 REV. B –8– 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 adjusting for zero error and full-scale error and is normally expressed 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 lad- der switches when these are turned off. For the IOUT1 terminal, it can 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. Output Capacitance This is the capacitance from the IOUT1 pin to AGND. 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 these devices, it is specified both with the AD843 as the output op amp in the normal current mode and with the AD820 in the biased current mode. Digital to Analog Glitch Impulse This is the amount of charge injected into the analog output when the inputs change state. It is specified as the area of the glitch in nV-s. It is measured with the reference input connected to AGND and the digital inputs toggled between all 1s and all 0s. As with Settling Time, it is specified with both the AD817 and the AD820. AC Feedthrough Error This is the error due to capacitive feedthrough from the DAC reference input to the DAC IOUT1 terminal, when all 0s are loaded in the DAC. Digital Feedthrough When the device is not selected, high frequency logic activity on the device digital inputs is capacitively coupled through the device to show up as noise on the IOUT1 pin and subsequently on the op amp output. This noise is digital feedthrough. PIN CONFIGURATIONS DIP/SOP SSOP DIP/SOP/SSOP DIP/SOP/SSOP 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 TOP VIEW (Not to Scale) AD7945 DB5 DB6 DB7 AGND DGND DB11 DB8 DB9 DB10 DB4 DB3 DB2 VREF VDD WR DB1 DB0 CS IOUT1 RFB TOP VIEW (Not to Scale) AD7943 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 IOUT1 IOUT2 AGND STB1 LD1 SRO SRI STB2 RFB VREF VDD CLR DGND STB4 STB3 LD2 TOP VIEW (Not to Scale) AD7943 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 NC = NO CONNECT STB2 SRI SRO IOUT2 AGND STB1 LD1 NC NC LD2 STB3 STB4 VREF VDD CLR DGND NC NC IOUT1 RFB TOP VIEW (Not to Scale) AD7948 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 DB4 DB5 DB6 AGND DGND CSMSB DB7 (MSB) CTRL DF/ DOR DB3 DB2 DB1 VREF VDD WR DB0 (LSB) LDAC CSLSB IOUT1 RFB |
Аналогичный номер детали - AD7943BRS |
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Аналогичное описание - AD7943BRS |
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