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AD712KR-REEL7 bảng dữ liệu(PDF) 10 Page - Analog Devices |
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AD712KR-REEL7 bảng dữ liệu(HTML) 10 Page - Analog Devices |
10 / 15 page AD712 REV. B –10– D/A CONVERTER APPLICATIONS The AD712 is an excellent output amplifier for CMOS DACs. It can be used to perform both 2 quadrant and 4 quadrant op- eration. The output impedance of a DAC using an inverted R-2R ladder approaches R for codes containing many 1s, 3R for codes containing a single 1, and for codes containing all zero, the output impedance is infinite. 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 AD712K with guaranteed 700 µV offset voltage minimizes this effect to achieve 12-bit performance. Figures 31 and 32 show the AD712 and AD7545 (12-bit CMOS DAC) configured for unipolar binary (2-quadrant multi- plication) or bipolar (4-quadrant multiplication) operation. Capacitor C1 provides phase compensation to reduce overshoot and ringing. +15V 1/2 AD712 GAIN ADJUST VIN VREF VDD RFB OUT1 AGND AD7545 DGND R2* *FOR VALUES OF R1 AND R2 SEE TABLE I DATA INPUT ANALOG COMMON C1 33pF 0.1 F VDD R1* 1/2 AD712 VOUT 0.1 F –15V R3 10k 1% R5 20k 1% R4 20k 1% 12 DB11–DB0 Figure 32. Bipolar Operation +15V 1/2 AD712 GAIN ADJUST VIN VREF VDD RFB OUT1 AGND AD7545 DGND VOUTA R2A* *REFER TO TABLE I DB11–DB0 ANALOG COMMON C1A 33pF 0.1 F VDD R1A* 1/2 AD712 GAIN ADJUST VIN VREF VDD RFB OUT1 AGND AD7545 DGND VOUTB R2B* *REFER TO TABLE I DB11–DB0 ANALOG COMMON C1B 33pF 0.1 F –15V R1B* VDD Figure 31. Unipolar Binary Operation R1 and R2 calibrate the zero offset and gain error of the DAC. Specific values for these resistors depend upon the grade of AD7545 and are shown below. Table I. Recommended Trim Resistor Values vs. Grades of the AD7545 for VDD = +5 V Trim Resistor JN/AQ/SD KN/BQ/TD LN/UD GLN/GUD R1 500 Ω 200 Ω 100 Ω 20 Ω R2 150 Ω 68 Ω 33 Ω 6.8 Ω |
Số phần tương tự - AD712KR-REEL7 |
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Mô tả tương tự - AD712KR-REEL7 |
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