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AD8644ARU 数据表(PDF) 5 Page - Analog Devices

部件名 AD8644ARU
功能描述  Single and Quad 18 V Operational Amplifiers
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD8644ARU 数据表(HTML) 5 Page - Analog Devices

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AD8614/AD8644
–5–
REV. 0
SUPPLY VOLTAGE – V
0
220
46
8
10
12
14 16
18
9
8
0
4
3
2
1
7
5
6
AV = 1
RL = 2k
CL = 200pF
TA = 25 C
SR+
SR
Figure 19. Slew Rate vs. Supply
Voltage
FREQUENCY – Hz
100
10
1
10
100
10k
1k
VS = 5V
TA = 25 C
Figure 20. Voltage Noise Density
vs. Frequency
FREQUENCY – Hz
100
10
1
10
100
10k
1k
VS = 18V
TA = 25 C
Figure 21. Voltage Noise Density vs.
Frequency
APPLICATIONS SECTION
Theory of Operation
The AD8614/AD8644 are processed using Analog Devices’ high
voltage, high speed, complementary bipolar process—HV XFCB.
This process includes trench isolated transistors that lower parasitic
capacitance.
Figure 22 shows a simplified schematic of the AD8614/AD8644.
The input stage is rail-to-rail, consisting of two complementary
differential pairs, one NPN pair and one PNP pair. The input stage
is protected against avalanche breakdown by two back-to-back
diodes. Each input has a 1.5 k
Ω resistor that limits input current
during over-voltage events and furnishes phase reversal protection
if the inputs are exceeded. The two differential pairs are connected
to a double-folded cascode. This is the stage in the amplifier with
the most gain. The double folded cascode differentially feeds the
output stage circuitry. Two complementary common emitter tran-
sistors are used as the output stage. This allows the output to swing
to within 125 mV from each rail with a 10 mA load. The gain of the
output stage, and thus the open loop gain of the op amp, depends on
the load resistance.
VCC
+
1.5k
VEE
VCC
VOUT
1.5k
VCC
Figure 22. Simplified Schematic
The AD8614/AD8644 have no built-in short circuit protection.
The short circuit limit is a function of high current roll-off of the
output stage transistors and the voltage drop over the resistor
shown on the schematic at the output stage. The voltage over this
resistor is clamped to one diode during short circuit voltage events.
Output Short-Circuit Protection
To achieve a wide bandwidth and high slew rate, the output of
the AD8614/AD8644 is not short-circuit protected. Shorting
the output directly to ground or to a supply rail may destroy the
device. The typical maximum safe output current is 70 mA.
In applications where some output current protection is needed,
but not at the expense of reduced output voltage headroom, a low
value resistor in series with the output can be used. This is shown
in Figure 23. The resistor is connected within the feedback loop
of the amplifier so that if VOUT is shorted to ground and VIN
swings up to 18 V, the output current will not exceed 70 mA.
For 18 V single supply applications, resistors less than 261
Ω are
not recommended.


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