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AD744JR-REEL датащи(PDF) 7 Page - Analog Devices

номер детали AD744JR-REEL
подробное описание детали  Precision, 500 ns Settling BiFET Op Amp
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD744JR-REEL датащи(HTML) 7 Page - Analog Devices

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REV. C
AD744
–7–
POWER SUPPLY BYPASSING
The power supply connections to the AD744 must maintain a
low impedance to ground over a bandwidth of 10 MHz or more.
This is especially important when driving a significant resistive
or capacitive load, since all current delivered to the load comes
from the power supplies. Multiple high quality bypass capacitors
are recommended for each power supply line in any critical
application. A 0.1
µF ceramic and a 1 µF electrolytic capacitor
as shown in Figure 24 placed as close as possible to the ampli-
fier (with short lead lengths to power supply common) will
assure adequate high frequency bypassing, in most applica-
tions. A minimum bypass capacitance of 0.1
µF should be used
for any application.
AD744
1 F
0.1 F
–VS
1 F
0.1 F
+VS
Figure 24. Recommended Power Supply Bypassing
MEASURING AD744 SETTLING TIME
The photos of Figures 26 and 27 show the dynamic response of
the AD744 while operating in the settling time test circuit of
Figure 25. 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, the AD744 under test, is clamped, ampli-
fied by op amp A2 and then clamped again.
TO
TEKTRONIX
7A26
OSCILLOSCOPE
PREAMP
INPUT SECTION
(VIA LESS THAN 1 FT 50
COAXIAL CABLE)
+15V
COM
–15V
+VS
–VS
1M
20pF
A2
AD3554
10k
5pF
10k
1.1k
+VS
–VS
0.47 F
0.47 F
2X
HP2835
0.2pF – 0.8pF
206
2X
HP2835
+VS
–VS
1 F
0.1 F
5pF – 18pF
10k
AD744
A1
5k
1 F
0.1 F
10pF
4.99k
200
4.99k
NULL
FLAT-TOP
PULSE
GENERATOR
DATA
DYNAMICS
5109
OR
EQUIVALENT
NOTE: USE CIRCUIT BOARD WITH GROUND PLANE
VERROR
10
VIN
Figure 25. Settling Time Test Circuit
The error signal is thus clamped twice: once to prevent overloading
amplifier A2 and then a second time to avoid overloading the
oscilloscope preamp. A Tektronix oscilloscope preamp type
7A26 was carefully chosen because it recovers from the
approximately 0.4 V overload quickly enough to allow accurate
measurement of the AD744’s 500 ns settling time. Amplifier A2
is a very high-speed FET-input op amp; it provides a voltage
gain of 10, amplifying the error signal output of the AD744
under test.
Figure 26. Settling Characteristics 0 to +10 V Step
Upper Trace: Output of AD744 Under Test (5 V/div.)
Lower Trace: Amplified Error Voltage (0.01%/div.)
Figure 27. Settling Characteristics 0 to –10 V Step
Upper Trace: Output of AD744 Under Test (5 V/div.)
Lower Trace: Amplified Error Voltage (0.01%/div.)


Аналогичный номер детали - AD744JR-REEL

производительномер деталидатащиподробное описание детали
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