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AD797AN Datasheet(PDF) 17 Page - Analog Devices |
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AD797AN Datasheet(HTML) 17 Page - Analog Devices |
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17 / 20 page  AD797 Rev. F | Page 17 of 20 * 7 * * * +VS VS = ±6Vdc VOUT AD797 26.1Ω 26.1Ω 6 3 4 2 –VS AD600 VIN *USE THE POWER SUPPLY BYPASSING SHOWN IN FIGURE 35. Professional Audio Signal Processing—DAC Buffers The low noise and low distortion of the AD797 make it an ideal choice for professional audio signal processing. An ideal I-to-V converter for a current output DAC would simply be a resistor to ground, were it not for the fact that most DACs do not operate linearly with voltage on their output. Standard practice is to operate an op amp as an I-to-V converter, creating a virtual ground at its inverting input. Normally, clock energy and current steps must be absorbed by the op amp output stage. However, in the configuration shown in Figure 53, Capacitor CF shunts high frequency energy to ground while correctly reproducing the desired output with extremely low THD and IMD. Figure 50. An Ultrasound Preamplifier Circuit Amorphous (Photodiode) Detector 7 * * +VS –VS AD797 CF 82pF 6 2 C1 2000pF 4 100Ω 3kΩ AD1862 DAC 3 VOUT *USE THE POWER SUPPLY BYPASSING SHOWN IN FIGURE 35. Large area photodiodes (CS ≥ 500 pF) and certain image detectors (amorphous Si) have optimum performance when used in conjunction with amplifiers with very low voltage (rather than very low current noise). Figure 51 shows the AD797 used with an amorphous Si (CS = 1000 pF) detector. The response is adjusted for flatness using capacitor CL, and the noise is dominated by voltage noise amplified by the ac noise gain. The AD797’s excellent input noise performance gives 27 μV rms total noise in a 1 MHz bandwidth, as shown by Figure 52. * 7 * +VS IS AD797 10kΩ 100Ω CL 50pF CS 1000pF 6 3 4 2 –VS VOUT *USE THE POWER SUPPLY BYPASSING SHOWN IN FIGURE 35. Figure 53. A Professional Audio DAC Buffer VOUT 7 +VS –VS AD797 6 2 4 3 1 5 VOS ADJUST –IN +IN 20kΩ Figure 51. Amorphous Detector Preamp Figure 54. Offset Null Configuration 100M 1k 100 100 0 60 20 40 80 10M 1M 100k 10k FREQUENCY (Hz) –80 –30 –50 –70 –60 –40 NOISE VOUT Figure 52. Total Integrated Voltage Noise and VOUT of Amorphous Detector Preamp |
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