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AD713JR-16-REEL bảng dữ liệu(PDF) 9 Page - Analog Devices |
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AD713JR-16-REEL bảng dữ liệu(HTML) 9 Page - Analog Devices |
9 / 14 page REV. C AD713 –9– Figure 10. Harmonic Distortion as Frequency for the Digital Audio Circuit of Figure 9 Driving the Analog Input of an A/D Converter An op amp driving the analog input of an A/D converter, such as that shown in Figure 11, must be capable of maintaining a constant output voltage under dynamically changing load condi- tions. In successive approximation converters, the input current is compared to a series of switched trial currents. The compari- son point is diode clamped but may vary by several hundred millivolts, resulting in high frequency modulation of the A/D input current. The output impedance of a feedback amplifier is made artificially low by its loop gain. At high frequencies, where the loop gain is low, the amplifier output impedance can ap- proach its open loop value. Figure 11. The AD713 as an ADC Buffer Most IC amplifiers exhibit a minimum open loop output imped- ance of 25 Ω, due to current limiting resistors. A few hundred microamps reflected from the change in converter loading can introduce errors in instantaneous input voltage. If the A/D con- version speed is not excessive and the bandwidth of the amplifier is sufficient, the amplifier’s output will return to the nominal value before the converter makes its comparison. However, many amplifiers have relatively narrow bandwidths, yielding slow recovery from output transients. The AD713 is ideally suited as a driver for A/D converters since it offers both a wide bandwidth and a high open loop gain. Figure 9. A D/A Converter Circuit for Digital Audio |
Số phần tương tự - AD713JR-16-REEL |
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Mô tả tương tự - AD713JR-16-REEL |
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