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AD797AR-REEL7 データシート(PDF) 11 Page - Analog Devices |
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AD797AR-REEL7 データシート(HTML) 11 Page - Analog Devices |
11 / 16 page AD797 REV. C –11– 600 100 20–120pF AD797 ** 2 7 3 4 6 ** VOUT –VS +VS * SEE TEXT ** USE POWER SUPPLY BYPASSING SHOWN IN FIGURE 32. IIN RS* CS* R1 Ω Ω Figure 36. I-to-V Converter Connection greater than 33 pF a 100 Ω series resistor is required. A by- passed balancing resistor (RS and CS) can be included to mini- mize dc errors. THE INVERTING CONFIGURATION The inverting configuration (Figure 37) presents a low input impedance, R1, to the source. For this reason, the goals of both low noise and input buffering are at odds with one another. Nonetheless, the excellent dynamics of the AD797 will make it the preferred choice in many inverting applications, and with care- ful selection of feedback resistors the noise penalties will be mini- mal. Some examples are presented in Table II and Figure 37. RL CL VIN AD797 ** 2 7 3 4 6 ** VOUT –VS +VS * SEE TEXT ** USE POWER SUPPLY BYPASSING SHOWN IN FIGURE 32. RS* R2 R1 Figure 37. Inverting Amplifier Connection Table III. Values for Inverting Circuit Noise Gain R1 R2 CL (Excluding rS) –1 1 k Ω 1 k Ω≈20 pF 3.0 nV/ √Hz –1 300 Ω 300 Ω≈10 pF 1.8 nV/ √Hz –10 150 Ω 1500 Ω≈5 pF 1.8 nV/ √Hz DRIVING CAPACITIVE LOADS The capacitive load driving capabilities of the AD797 are dis- played in Figure 38. At gains over 10 usually no special precau- tions are necessary. If more drive is desirable the circuit in Figure 39 should be used. Here a 5000 pF load can be driven cleanly at any noise gain ≥ 2. 100nF 10nF 1pF 110 1k 100 1nF 100pF 10pF CLOSED-LOOP GAIN Figure 38. Capacitive Load Drive Capability vs. Closed Loop Gain 100 1k C1 1k 20pF 33 VIN AD797 ** 2 7 3 4 6 ** VOUT –VS +VS ** USE POWER SUPPLY BYPASSING SHOWN IN FIGURE 32. 200pF Ω Ω Ω Ω Figure 39. Recommended Circuit for Driving a High Capacitance Load SETTLING TIME The AD797 is unique among ultralow noise amplifiers in that it settles to 16 bits (<150 µV) in less than 800 ns. Measuring this performance presents a challenge. A special test setup (Figure 40) was developed for this purpose. The input signal was ob- tained from a resonant reed switch pulse generator, available from Tektronix as calibration Fixture No. 067-0608-00. When open, the switch is simply 50 Ω to ground and settling is purely a passive pulse decay and inherently flat. The low repetition rate signal was captured on a digital oscilloscope after being ampli- fied and clamped twice. The selection of plug-in for the oscillo- scope was made for minimum overload recovery. |
同様の部品番号 - AD797AR-REEL7 |
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同様の説明 - AD797AR-REEL7 |
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