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AD712AQ Datasheet(PDF) 16 Page - Analog Devices

Part No. AD712AQ
Description  Dual Precision, Low Cost, High Speed BiFET Op Amp
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD712
Rev. G | Page 16 of 20
200ns
500mV
PD711 BUFF
–10V ADC IN
1mV
100
10
0%
90
Figure 44. ADC Input Unity Gain Buffer Recovery Times, −10 V ADC IN
200ns
500mV
PD711 BUFF
–5V ADC IN
1mV
100
10
0%
90
Figure 45. ADC Input Unity Gain Buffer Recovery Times, −5 V ADC IN
DRIVING A LARGE CAPACITIVE LOAD
The circuit in Figure 46 uses a 100 Ω isolation resistor that
enables the amplifier to drive capacitive loads exceeding
1500 pF; the resistor effectively isolates the high frequency
feedback from the load and stabilizes the circuit. Low frequency
feedback is returned to the amplifier summing junction via the
low-pass filter formed by the 100 Ω series resistor and the Load
Capacitance CL. Figure 47 shows a typical transient response for
this connection.
1/2
AD712
0.1µF
0.1µF
–VIN
+VIN
INPUT
R1
2kΩ
1500pF
10kΩ
1500pF
20Ω
1000pF
C1
R1
4.99kΩ
4.99kΩ
30pF
OUTPUT
100Ω
+ –
+
TYPICAL CAPACITANCE
LIMIT FOR VARIOUS
LOAD RESISTORS
C1 UP TO
Figure 46. Circuit for Driving a Large Capacitive Load
5V
1µs
100
10
0%
90
Figure 47. Transient Response RL = 2 kΩ, CL = 500 pF




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