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AD381 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD381
Beschreibung High Speed / Low Drift FET Operational Amplifier
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 8 Seiten
AD381 Datasheet, Funktion
-.. ANALOG
W DEVICES
I
,.. ~- ~....-...
-i:- !' --. -
.
HighSpeed,LowDrift
FEYOperationaAl mplifier
.
~ .~
FEATURES
High Slew Rate 30V/p,s
Fast Settling to 0.1%: 700ns
High Output Current: 50mA for AD382
(10mA for AD381)
Low Drift (5p,Vf'C-L Grades)
Low Offset Voltage (250p,V-L Grades)
Low Input Bias Currents
Low Noise (2p,V pop)
OBPRODUCT DESCRIPTION
SThe AD3811AD382 are hybrid operational amplifiers combining
the very low input bias current advantages of a FET input stage
Owith high slew rate and line driving capability of a high power
Loutput stage.
The offset voltage (0.2SmV maximum for the L grades) and
Eoffset voltage drift (SfLV/oCmaximum for the L grades) are
TEexceptionally low for high speed operational amplifiers.
PRODUCT HIGHLIGHTS
I. Laser trimming techniques reduce offset voltage drift to
SfLVrC max and reduce offset voltage to only 2S0fLV max on
the L grade versions.
2. Analog Devices FET processing provides lOOpA max (20pA
typical) bias currents specified after 5 minutes of warm-up.
3. Internal frequency compensation, low offset voltage, and full
device protection eliminate the need for external components
In addition to superior low drift performance, the AD381 and
and adjustments. This reduces circuit size and complexity
AD382 offer the lowest guaranteed input bias currents of any
and increases reliability.
wideband FET amplifier with lOOpAmax for the J grades of
each and SOpAmax for the AD382 K, L and S grades. Since
Analog Devices, unlike most other manufacturers, specifies
input bias current with the amplifiers warmed-up, our FET
4. The fast settling output (700ns to 0.1%) makes the AD381
and AD382 ideal for D/A and AID converter amplifier
applications.
amplifiers are specified under actual operating conditions.
The AD381 and AD382 are especially designed for use in appli-
cations, such as precision high speed data acquisition systems
and signal conditioning circuits, that require excellent input
parameters and a fast, high power output.
5. The AD382's high output current (SOmA minimum at :t 10
volts) makes it suitable for driving terminated (200n) twisted
pair cables over the commercial temperature ranges.
6. The high slew rate (30V/fLS) and high gain bandwidth product
(SMHz) make the AD381 and AD382 an ideal choice for
The AD381 and AD382 are offered in three commercial versions,
sample and holds and for high speed integrator circuits.
J, K and L specified from 0 to + 70°C, and one extended tem-
perature version, the S specified from - 55°C to + 125°c. All
grades are packaged in hermetically sealed metal cans.
)
Information furnished by Analog Devices is believed to be accurate
and reliable. However. no responsibility is assumed by Analog Devices
for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implica-
tion or otherwise under any patent or patent rights of Analog Devices.
Route 1 Industrial Park; P.O. Box 280; Norwood, Mass. 02062
Tel: 617/329-4700
TWX: 710/394-6577
West Coast
Mid-West
Texas
714/641-9391
312/653-5000
214/231-5094






AD381 Datasheet, Funktion
>Ys
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-Vs
7°".' ~,.0.'
Figure 24c. A 0382 Unity Gain
Follower Pulse Response
(Small Signal)
Figure 25a. AO382 Overdrive
Recovery Test Circuit
Figure 25b. AO382 Overdrive
Recovery Response
40
+Vs
35
30
, V,N
25
~.g
20
~
;J: 15
;:
~
'" 10
AD382
JIJ+-tlVV
-v,
VOUT
OB0.2 0.4 0.6 0.8 1.0 1.2 1.4
-INPUT DIFFERENTIAL VOLTAGE <V
1.6
SFigure 26. Slew Rate vs. Input Voltage
O>Ys
Figure 27a. AO381 Overdrive Recovery
Test Circuit
Figure 27b. AO381 Overdrive
Recovery Response
LETRL VOUT
V,N
E2kf!
~~~'
J
-Vs ~O.,.' ~'o.,
Rgum28a. AO381UnftyGam
Follower
Figure 28b. AO381 Unity Gain
Follower Large Signal Pulse
Response
Compensation Capacitor
The AD381 and AD382 have sufficient phase margin to insure
stability in most applications without compensation. However,
in applications with capacitive load, very high speed, low gain
or high resistor values (RIN"",5kO) the high frequency noise
rejection will be improved by adding a compensation capacitor.
The AD381 and AD382 have an input capacitance of 7pF.
When soldered on a printed circuit board or inserted in a socket
the total input capacitance could be lOpF. This input capacitance
can lower the 0° phase margin crossover point from 8MHz, as
shown in Figure IS, to around IMHz.
By adding a small compensation capacitor in the feedback loop
we can cancel the effects of the input capacitance and reduce
high frequency noise gain. 5 to lOpF will suffice in most appli-
cations. In some current output, digital-to-analog converter
applications the output capacitance of the DAC may be 200pF
which would require a large compensation capacitor in the amplifier
feedback loop.
A scheme for compensating inverting and noninverting circuits
~.is shown in Figure 29. Choose CF = CIN
C,
Rl
I
-LI .
CON......
~
R2
AD381 OR
AD382
+/
(INCLUDE HIGH FREQUENCY
IMPEDANCE IN Rll
SQURCE
a. Inverting Amplifier
C,
b. Noninverting Amplifier
Figure 29.
-6-
-----
)

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