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AD711JR-REEL Folha de dados(PDF) 9 Page - Analog Devices |
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AD711JR-REEL Folha de dados(HTML) 9 Page - Analog Devices |
9 / 12 page AD711 REV. A –9– Figure 28a. Settling Characteristics 0 to +10 V Step Upper Trace: Output of AD711 Under Test (5 V/Div) Lower Trace: Amplified Error Voltage (0.01%/Div) Figure 28b. Settling Characteristics 0 to –10 V Step Upper Trace: Output of AD711 Under Test (5 V/Div) Lower Trace: Amplified Error Voltage (0.01%/Div) Figure 29. Settling Time Test Circuit GUARDING The low input bias current (15 pA) and low noise characteristics of the AD711 BiFET op amp make it suitable for electrometer applications such as photo diode preamplifiers and picoampere current-to-voltage converters. The use of a guarding technique such as that shown in Figure 30, in printed circuit board layout and construction is critical to minimize leakage currents. The guard ring is connected to a low impedance potential at the same level as the inputs. High impedance signal lines should not be extended for any unnecessary length on the printed circuit board. Figure 30. Board Layout for Guarding Inputs D/A CONVERTER APPLICATIONS The AD711 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 in- ternal 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 AD711K with guaranteed 500 µV offset voltage minimizes this effect to achieve 12-bit performance. Figures 31 and 32 show the AD711 and AD7545 (12-bit CMOS DAC) configured for unipolar binary (2-quadrant multi- plication) or bipolar (4-quadrant multiplication) operation. Ca- pacitor C1 provides phase compensation to reduce overshoot and ringing. |
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