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AD797AN Scheda tecnica(PDF) 16 Page - Analog Devices |
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AD797AN Scheda tecnica(HTML) 16 Page - Analog Devices |
16 / 20 page AD797 Rev. F | Page 16 of 20 extraction of a low level signal in the presence of common- mode noise. As shown in Figure 47, the AD797 provides this function with only 9 nV/√Hz noise at the output. Figure 48 shows the AD797 20-bit THD performance over the audio band and the 16-bit accuracy to 250 kHz. ** ** AD797 6 2 3 1kΩ DIFFERENTIAL INPUT 1kΩ 1kΩ 1kΩ 20pF 50pF* 20pF –VS +VS 4 7 8 VOUT OPTIONAL USE THE POWER SUPPLY BYPASSING SHOWN IN FIGURE 35. * ** Figure 46. Differential Line Receiver 16 6 10M 12 8 100 10 10 14 1M 100k 10k 1k FREQUENCY (Hz) Figure 47. Output Voltage Noise Spectral Density for Differential Line Receiver FREQUENCY (Hz) –90 300k –120 –130 300 100 –110 –100 100k 30k 10k 3k 1k 0.003 0.0003 0.001 0.0001 WITHOUT OPTIONAL 50pF CN WITH OPTIONAL 50pF CN MEASUREMENT LIMIT Figure 48. Total Harmonic Distortion (THD) vs. Frequency for Differential Line Receiver A General-Purpose ATE/Instrumentation I/O Driver The ultralow noise and distortion of the AD797 can be combined with the wide bandwidth, slew rate, and load drive of a current feedback amplifier to yield a very wide dynamic range general-purpose driver. The circuit shown in Figure 49 combines the AD797 with the AD811 in just such an application. Using the component values shown, this circuit is capable of better than −90 dB THD with a ±5 V, 500 kHz output signal. The circuit is, therefore, suitable for driving a high resolution ADC as an output driver in automatic test equipment (ATE) systems. Using a 100 kHz sine wave, the circuit drives a 600 Ω load to a level of 7 V rms with less than −109 dB THD and a 10 kΩ load at less than −117 dB THD. * 7 * * * +VS +VS –VS AD797 22pF 2kΩ 649Ω 649Ω 1kΩ R2 6 3 4 2 7 AD811 6 2 4 3 –VS *USE THE POWER SUPPLY BYPASSING SHOWN IN FIGURE 35. VOUT VIN Figure 49. A General-Purpose ATE/Instrumentation I/O Driver Ultrasound/Sonar Imaging Preamp The AD600 variable gain amplifier provides the time-controlled gain (TCG) function necessary for very wide dynamic range sonar and low frequency ultrasound applications. Under some circumstances, it is necessary to buffer the input of the AD600 to preserve its low noise performance. To optimize dynamic range, this buffer should have a maximum of 6 dB of gain. The combination of low noise and low gain is difficult to achieve. The input buffer circuit shown in Figure 50 provides 1 nV/√Hz noise performance at a gain of 2 (dc to 1 MHz) by using 26.1 Ω resistors in its feedback path. Distortion is only −50 dBc at 1 MHz for a 2 V p-p output level and drops rapidly to better than −70 dBc at an output level of 200 mV p-p. |
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