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AD8610BR-REEL7 Datasheet(PDF) 10 Page - Analog Devices

No. de pieza AD8610BR-REEL7
Descripción Electrónicos  Precision, Very Low Noise, Low Input Bias Current, Wide Bandwidth JFET Operational Amplifier
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

AD8610BR-REEL7 Datasheet(HTML) 10 Page - Analog Devices

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REV. D
–10–
AD8610/AD8620
Driving Large Capacitive Loads
The AD8610 has excellent capacitive load driving capability and
can safely drive up to 10 nF when operating with
±5 V supply.
Figures 4 and 5 compare the AD8610/AD8620 against the OPA627
in the noninverting gain configuration driving a 10 k
Ω resistor and
10,000 pF capacitor placed in parallel on its output, with a square
wave input set to a frequency of 200 kHz. The AD8610 has much
less ringing than the OPA627 with heavy capacitive loads.
TIME – 2 s/DIV
VS =
5V
CL = 10,000pF
RL = 10k
Figure 4. OPA627 Driving CL = 10,000 pF
TIME – 2 s/DIV
VS =
5V
CL = 10,000pF
RL = 10k
Figure 5. AD8610/AD8620 Driving CL = 10,000 pF
The AD8610/AD8620 can drive much larger capacitances without
any external compensation. Although the AD8610/AD8620 is stable
with very large capacitive loads, remember that this capacitive
loading will limit the bandwidth of the amplifier. Heavy capacitive
loads will also increase the amount of overshoot and ringing at the
output. Figures 7 and 8 show the AD8610/AD8620 and the OPA627
in a noninverting gain of +2 driving 2
µF of capacitance load. The
ringing on the OPA627 is much larger in magnitude and continues
more than 10 times longer than the AD8610.
VIN = 50mV
2k
2k
–5V
+5V
2 F
3
2
7
4
Figure 6. Capacitive Load Drive Test Circuit
TIME – 20 s/DIV
VS =
5V
RL = 10k
CL = 2 F
Figure 7. OPA627 Capacitive Load Drive, AV = +2
TIME – 20 s/DIV
VS =
5V
RL = 10k
CL = 2 F
Figure 8. AD8610/AD8620 Capacitive Load Drive, AV = +2
Slew Rate (Unity Gain Inverting vs. Noninverting)
Amplifiers generally have a faster slew rate in an inverting unity
gain configuration due to the absence of the differential input
capacitance. Figures 9 through 12 show the performance of the
AD8610 configured in a gain of –1 compared to the OPA627.
The AD8610 slew rate is more symmetrical, and both the positive
and negative transitions are much cleaner than in the OPA627.


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