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AD382 PDF 데이터시트 ( Data , Function )

부품번호 AD382 기능
기능 High Speed / Low Drift FET Operational Amplifier
제조업체 Analog Devices
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AD382 데이터시트, 핀배열, 회로
-.. ANALOG
W DEVICES
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.
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




AD382 pdf, 반도체, 판매, 대치품
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125 0 5 10 15 20
SUPPLYVOLTAGE - tV
Figure 11a. Open Loop Gain vs.
Temperature for AD381
Figure llb. Open Loop Gain vs.
Temperature for A 0382
Figure 12. Open Loop 1(oltage Gain
vs. Supply Voltage
120 110 120
110,----
I!g ......-
ZI 100
;";:
O~«~ 90---------i------
g
B80
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SO701k
i
2k 5k 10k 20k
LOAO RESISTANCE- Ohms
50k
LFigure 13a. Voltage Gain vs.
ETE0Load Resistance for AD381
100
!g
~90
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~
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70
I--
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60
200
10k
Figure 13b. Voltage Gain vs.
Load Resistance for A 0382
120
i !.
i--J'0kn4-
-
C,"500pFIAO3821
! C,"200pFIAD381'
20
O.
10 100
1k 10k lOOk
FREQUENCY - H,
10M
Figure 14. Open Loop Gain vs.
Frequency
120
100 1001---;-------.-.
180
0
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10 100
1M 10M
Figure 15. Phase Margin vs.
Frequency
30
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520
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Figure 18. Large Signal Frequency
Response
0'0
100
1k
1Ok lOOk
1M 10M
FREOUENCY - H,
Figure 16. Common-Mode Rejection vs.
Frequency
50
0
10 1k 1Ok lOOk 1M 10M
FREQUENCY
- H,
Figure 17. Power Supply Rejection vs.
Frequency
10
~40
~
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.izn.. 30
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a..:. 20
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10
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Figure 19. Noise vs. Frequency
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=::>=
0
-1001. 0.2
i'
0.4 0.6 0.8
SETTLINGTIME- '"
Figure 20a. AO381 Output Settling Time
vs. Output Voltage Swing and
Error (Circuit of Figure 22a)
-4-
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AD382 전자부품, 판매, 대치품
Offset Null
The AD3811AD382 should not have to be offset nulled for most
applications because of its low initial offset voltage. If nulling is
required for very high precision applications, such as an output
amplifier for 13-bit or better digital-to-analog converters, connect
a lOkn potentiometer between the offset null pins (pins I and 5
for the AD381 and pins 2 and 8 for the AD382). The wiper of
the potentiometer is tied to the negative supply. With the analog
input signal to the circuit grounded, adjust the potentiometer
for zero output.
DIGITAL
INPUTS
AD7545
AD382 Heat Sinking
Figure 31. CMOS DAC Output Amplifier
A heat sink for convection cooling is required if operating at full
power and at ambient temperatures greater than 70°C. As shown
3pF
in Figure 5 the free air power dissipation curve for the AD382
crosses the full power dissipation point (0.75W) at 70°C. The
power dissipation can be improved by using a heat sink up to
the case power dissipation curve (also referred to as the infinite
heat sink power dissipation curve). We recommend connecting
the heat sink to the AD382 case and keeping the combination
Oungrounded. The case of the AD382 is not connected to any pin
and should be allowed to "float".
BTYPICAL CIRCUITS
SIn many digital-to-analog converter applications, including auto-
matic test equipment, the load may be large enough to require a
Obuffer amplifier. The AD382 can supply:!: lOV into a 200.0
Lload. The AD381 can supply up to :!:10V into a 1kn load.
The AD381 and AD382 are also well suited for CMOS DAC
Eoutput amplifier applications due to their low initial offset
TEvoltage.
10kl!
V,N
INPUT
GROUND
RF 10kl!
AD578
12-81T
AID
DIGITAL
OUTPUTS
lOkI!'
AGND
3pF'
'Optional Differential Input Components Used to Reject
Noise Between Input G..und and the AID Analog G..und.
Figure 32. Fast-Settling Buffer
Many high speed AID convertersrequire a widebandbuffer that
can hold a constant output voltage under dynamically-changing
load conditions that fluctuate at the bit decision rate.
Its quick recovery from load variations makes the AD382 an
excellent buffer for fast successive approximation AID
converters.
12-81T
DIGITAL
INPUT
Your
~
Figure 30. Buffer Amplifier to a 12-Bit Voltage Output
DAC
No external trims are required with 12-bit CMOS DACs. Since
the output impedance of CMOS DACs varies with input code,
the output voltage could appear nonmonotonic if the offset
voltage is greater than 1I2LSB. An LSB for a 12-bit DAC such
as the AD7545 is 2.44mV (10 volts full scale/4096). Thus the
AD381 and AD382, with only 1mV of offset maximum, assure
monotonic performance without external trims.
-7-

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