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AD8058AR Arkusz danych(PDF) 11 Page - Analog Devices |
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AD8058AR Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 16 page REV. B AD8057/AD8058 –11– FREQUENCY (Hz) 100 10 0.1 10 100M 100 1k 10k 100k 1 1M 10M TPC 35. Current Noise vs. Frequency FREQUENCY (MHz) 100 10 0.1 0.1 1000 1 10 100 1 TPC 36. Output Impedance vs. Frequency APPLICATIONS Driving Capacitive Loads When driving a capacitive load, most op amps will exhibit over- shoot in their pulse response. Figure 3 shows the relationship between the capacitive load that results in 30% overshoot and the closed-loop gain of an AD8058. It can be seen that, under the Gain = +2 condition, the device is stable with capacitive loads of up to 69 pF. In general, to minimize peaking or to ensure device stability for larger values of capacitive loads, a small series resistor, RS, can be added between the op amp output and the load capacitor, CL, as shown in Figure 4. For the setup shown in Figure 4, the relationship between RS and CL was empirically derived and is shown in Table I. CLOSED-LOOP GAIN 500 400 0 15 2 34 300 200 100 RS = 2.4 RS = 0 Figure 3. Capacitive Load Drive vs. Closed-Loop Gain Table I. Recommended Value for Resistors RS, RF, RG vs. Capacitive Load, CL, Which Results in 30% Overshoot Gain RF RG CL w/RS = 0 Ω CL w/RS = 2.4 Ω ( Ω)(Ω) (pF) (pF) 1 100 11 13 2 100 100 51 69 3 100 50 104 153 4 100 33.2 186 270 5 100 25 245 500 10 100 11 870 1580 –2.5V RG 50k VIN = 200mV p-p AD8058 0.1 F 10 F 0.1 F 10 F +2.5V RF CL RS VOUT FET PROBE Figure 4. Capacitive Load Drive Circuit 100mV 50ns/DIV 200mV –100mV –200mV + OVERSHOOT 29.0% 100mV/DIV Figure 5. Typical Pulse Response with CL = 65 pF, Gain = +2, and VS = ±2.5 V |
Podobny numer części - AD8058AR |
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Podobny opis - AD8058AR |
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