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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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AD7485 Fiches technique(PDF) 8 Page - AMIC Technology |
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AD7485 Fiches technique(HTML) 8 Page - AMIC Technology |
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8 / 16 page  REV. 0 –8– AD7485 FREQUENCY – kHz 0 300 100 200 400 500 –40 0 –60 –80 –20 –120 –100 –140 fIN = 10.7kHz SNR = 78.76dB SNR + D = 78.70dB THD = –97.10dB TPC 7. 64k FFT Plot with 10 kHz Input Tone FREQUENCY – kHz –40 0 –60 –80 –20 –120 –100 –140 0 300 100 200 400 500 fIN = 507.3kHz SNR = 78.35dB SNR + D = 78.33dB THD = –100.33dB TPC 8. 64k FFT Plot with 500 kHz Input Tone 220 BIAS VOLTAGE 1 2 3 4 5 6 7 8 AD8021 50 AC SIGNAL 220 10pF –VS +VS – + VIN 10pF Figure 2. Analog Input Circuit Used for 500 kHz Input Tone 1 2 3 4 5 6 7 8 AD829 1k 1k 100 AC SIGNAL BIAS VOLTAGE 150 220pF –VS +VS – + VIN Figure 1. Analog Input Circuit Used for 10 kHz Input Tone Figure 1 shows the analog input circuit used to obtain the data for the FFT plot shown in TPC 7. The circuit uses an Analog Devices AD829 op amp as the input buffer. A bipolar analog signal is applied as shown and biased up with a stable, low noise dc voltage connected to the labeled terminal shown. A 220 pF compensation capacitor is connected between Pin 5 of the AD829 and the analog ground plane. The AD829 is supplied with +12 V and –12 V supplies. The supply pins are decoupled as close to the device as possible, with both a 0.1 µF and 10 µF capacitor connected to each pin. In each case, the 0.1 µF capacitor should be the closer of the two capacitors to the device. More information on the AD829 is available on the Analog Devices website. For higher input bandwidth applications, Analog Devices’ AD8021 op amp (also available as a dual AD8022) is the recommended choice to drive the AD7485. Figure 2 shows the analog input circuit used to obtain the data for the FFT plot shown in TPC 8. A bipolar analog signal is applied to the terminal shown and biased with a stable, low noise dc voltage connected as shown. A 10 pF compensation capacitor is connected between Pin 5 of the AD8021 and the negative supply. As with the previous circuit, the AD8021 is supplied with +12 V and –12 V supplies. The supply pins are decoupled as close to the device as possible with both a 0.1 µF and 10 µF capacitor connected to each pin. In each case, the 0.1 µF capacitor should be the closer of the two capaci- tors to the device. The AD8021 Logic Reference pin is tied to analog ground and the DISABLE pin is tied to the positive sup- ply as shown. Detailed information on the AD8021 is available on the Analog Devices website. |
Numéro de pièce similaire - AD7485 |
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Description similaire - AD7485 |
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