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AD712AQ Datasheet(PDF) 13 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 13 of 20
CF
40
30
0
10
0
20
10
50
60
GN = 4.0
GN = 3.0
20
30
40
50
60
GN = 2.0
GN = 1.5
GN = 1.0
Figure 34. Value of Capacitor CF vs. Value of CX
The photos of Figure 35 and Figure 36 show the dynamic
response of the AD712 in the settling test circuit of Figure 37.
5V
5mV
500ns
100
10
0%
90
Figure 35. Settling Characteristics 0 V to +10 V Step
Upper Trace: Output of AD712 Under Test (5 V/Div)
Lower Trace: Amplified Error Voltage (0.01%/Div)
5V
5mV
500ns
100
10
0%
90
Figure 36. Settling Characteristics 0 V to −10 V Step
Upper Trace: Output of AD712 Under Test (5 V/Div)
Lower Trace: Amplified Error Voltage (0.01%/Div)
The input of the settling time fixture is driven by a flat top pulse
generator. The error signal output from the false summing node
of A1 is clamped, amplified by A2, and then clamped again. The
error signal is thus clamped twice: once to prevent overloading
Amplifier A2 and then a second time to avoid overloading the
oscilloscope preamp. The Tektronix oscilloscope preamp type
7A26 was carefully chosen because it does not overload with
these input levels. Amplifier A2 needs to be a very high speed
FET-input op amp; it provides a gain of 10, amplifying the error
signal output of A1.
+15V
0.1µF
1/2
AD712
10pF
–15V
5kΩ
4.99kΩ
0.47µF
1/2
AD712
0.47µF
200Ω
4.99kΩ
5 TO 18pF
0.1µF
10kΩ
10kΩ
VIN
HP2835
HP2835
20pF
1MΩ
10kΩ
0.2 TO 0.6pF
1.1kΩ
5pF
205Ω
–15V +15V
VOUT
TEKTRONIX 7A26
OSCILLOSCOPE
PREAMP
INPUT SECTION
VERROR × 5
DATA
DYNAMICS
5109
(OR EQUIVALENT
FLAT TOP PULSE
GENERATION)
+
Figure 37. Settling Time Test Circuit




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