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AD7531JN Datasheet(PDF) 4 Page - Intersil Corporation |
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AD7531JN Datasheet(HTML) 4 Page - Intersil Corporation |
4 / 9 page 10-10 Definition of Terms Nonlinearity: Error contributed by deviation of the DAC transfer function from a “best straight line” through the actual plot of transfer function. Normally expressed as a percent- age of full scale range or in (sub)multiples of 1 LSB. Resolution: It is addressing the smallest distinct analog output change that a D/A converter can produce. It is commonly expressed as the number of converter bits. A converter with resolution of n bits can resolve output changes of 2-N of the full-scale range, e.g., 2-N VREF for a unipolar conversion. Resolution by no means implies linearity. Settling Time: Time required for the output of a DAC to set- tle to within specified error band around its final value (e.g., 1/ 2 LSB) for a given digital input change, i.e., all digital inputs LOW to HIGH and HIGH to LOW. Gain Error: The difference between actual and ideal analog output values at full scale range, i.e., all digital inputs at HIGH state. It is expressed as a percentage of full scale range or in (sub)multiples of 1 LSB. Feedthrough Error: Error caused by capacitive coupling from VREF to IOUT1 with all digital inputs LOW. Output Capacitance: Capacitance from IOUT1 and IOUT2 terminals to ground. Output Leakage Current: Current which appears on IOUT1 terminal when all digital inputs are LOW or on IOUT2 terminal when all digital inputs are HIGH. Detailed Description The AD7520, AD7530, AD7521 and AD7531 are monolithic, multiplying D/A converters. A highly stable thin film R-2R resistor ladder network and NMOS SPDT switches form the basis of the converter circuit, CMOS level shifters permit low power TTL/CMOS compatible operation. An external voltage or current reference and an operational amplifier are all that is required for most voltage output applications. A simplified equivalent circuit of the DAC is shown in the Functional Diagram. The NMOS SPDT switches steer the lad- der leg currents between IOUT1 and IOUT2 buses which must be held either at ground potential. This configuration main- tains a constant current in each ladder leg independent of the input code. Converter errors are further reduced by using separate metal interconnections between the major bits and the outputs. Use of high threshold switches reduce offset (leak- age) errors to a negligible level. The level shifter circuits are comprised of three inverters with positive feedback from the output of the second to the first, see Figure 1. This configuration results in TTL/CMOS compatible operation over the full military temperature range. With the lad- der SPDT switches driven by the level shifter, each switch is binarily weighted for an ON resistance proportional to the respective ladder leg current. This assures a constant voltage drop across each switch, creating equipotential terminations for the 2R ladder resistors and highly accurate leg currents. Pin Descriptions AD7520/30 AD7521/31 PIN NAME DESCRIPTION 11 IOUT1 Current Out summing junction of the R2R ladder network. 22 IOUT2 Current Out virtual ground, return path for the R2R ladder network. 3 3 GND Digital Ground. Ground potential for digital side of D/A. 4 4 Bits 1(MSB) Most Significant Digital Data Bit. 5 5 Bit 2 Digital Bit 2. 6 6 Bit 3 Digital Bit 3. 7 7 Bit 4 Digital Bit 4. 8 8 Bit 5 Digital Bit 5. 9 9 Bit 6 Digital Bit 6. 10 10 Bit 7 Digital Bit 7. 11 11 Bit 8 Digital Bit 8. 12 12 Bit 9 Digital Bit 9. 13 13 Bit 10 Digital Bit 10 (AD7521/31). Least Significant Digital Data Bit (AD7520/30). - 14 Bit 11 Digital Bit 11 (AD7521/31). - 15 Bit 12 Least Significant Digital Data Bit (AD7521/31). 14 16 V+ Power Supply +5V to +15V. 15 17 VREF Voltage Reference Input to set the output range. Supplies the R2R resistor ladder. 16 18 RFEEDBACK Feedback resistor used for the current to voltage conversion when using an external Op Amp. V+ DTL/TTL/ CMOS INPUT 13 4 5 6 7 2 89 TO LADDER IOUT2 IOUT1 FIGURE 1. CMOS SWITCH AD7520, AD7530, AD7521, AD7531 |
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