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AD713 Fiches technique(PDF) 10 Page - Analog Devices |
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AD713 Fiches technique(HTML) 10 Page - Analog Devices |
10 / 14 page REV. C AD713 –10– Figure 12. Buffer Recovery Time Source Current = 2 mA Figure 13. Buffer Recovery Time Sink Current = 1 mA Driving A Large Capacitive Load The circuit of Figure 14 employs a 100 Ω isolation resistor which enables the amplifier to drive capacitive loads exceeding 1500 pF; the resistor effectively isolates the high frequency feedback from the load and stabilizes the circuit. Low frequency feedback is returned to the amplifier summing junction via the low pass filter formed by the 100 Ω series resistor and the load capacitance, C1. Figure 15 shows a typical transient response for this connection. Figure 14. Circuit for Driving a Large Capacitance Load Table II. Recommended Trim Resistor Values vs. Grades for AD7545 for VD = 5 V Trim JN/AQ/ KN/BQ/ LN/CQ/ GLN/GCQ/ Resistor SD TD UD GUD R1 500 Ω 200 Ω 100 Ω 20 Ω R2 150 Ω 68 Ω 33 Ω 6.8 Ω Figure 15. Transient Response, RL = 2 kΩ, CL = 500 pF CMOS DAC APPLICATIONS The AD713 is an excellent output amplifier for CMOS DACs. It can be used to perform both 2 and 4 quadrant operation. The output impedance of a DAC using an inverted R-2R ladder approaches R for codes containing many “1”s, 3R for codes con- taining a single “1” and infinity for codes containing all zeros. For example, the output resistance of the AD7545 will modu- late between 11 k Ω and 33 kΩ. Therefore, with the DAC’s internal feedback resistance of 11 k Ω, the noise gain will vary from 2 to 4/3. This changing noise gain modulates the effect of the input offset voltage of the amplifier, resulting in nonlinear DAC amplifier performance. The AD713, with its guaranteed 1.5 mV input offset voltage, minimizes this effect achieving 12-bit performance. Figures 16 and 17 show the AD713 and a 12-bit CMOS DAC, the AD7545, configured for either a unipolar binary (2-quadrant multiplication) or bipolar (4-quadrant multiplication) operation. Capacitor C1 provides phase compensation which reduces over- shoot and ringing. Figure 16. Unipolar Binary Operation Figure 17. Bipolar Operation |
Numéro de pièce similaire - AD713 |
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Description similaire - AD713 |
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