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AD705 데이터시트 PDF




Analog Devices에서 제조한 전자 부품 AD705은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 AD705 기능
기능 Picoampere Input Current Bipolar Op Amp
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AD705 데이터시트, 핀배열, 회로
a
Picoampere Input Current
Bipolar Op Amp
AD705
FEATURES
DC PERFORMANCE
25 V max Offset Voltage (AD705T)
0.6 V/؇C max Drift (AD705K/T)
100 pA max Input Bias Current (AD705K)
600 pA max IB Over MIL Temperature Range (AD705T)
114 dB min CMRR (AD705K/T)
114 dB min PSRR (AD705T)
200 V/mV min Open Loop Gain
0.5 V p-p typ Noise, 0.1 Hz to 10 Hz
600 A max Supply Current
AC PERFORMANCE
0.15 V/µs Slew Rate
800 kHz Unity Gain Crossover Frequency
10,000 pF Capacitive Load Drive Capability
Low Cost
Available in 8-Pin Plastic Mini-DlP, Hermetic Cerdip
and Surface Mount (SOIC) Packages
MIL-STD-883B Processing Available
Dual Version Available: AD706
Quad Version: AD704
APPLICATIONS
Low Frequency Active Filters
Precision Instrumentation
Precision Integrators
PRODUCT DESCRIPTION
The AD705 is a low power bipolar op amp that has the low in-
put bias current of a BiFET amplifier but which offers a signifi-
cantly lower IB drift over temperature. The AD705 offers many
of the advantages of BiFET and bipolar op amps without their
inherent disadvantages. It utilizes superbeta bipolar input tran-
sistors to achieve the picoampere input bias current levels of
FET input amplifiers (at room temperature), while its IB typi-
cally only increases 5 times vs. BiFET amplifiers which exhibit a
1000X increase over temperature. This means that, at room
temperature, while a typical BiFET may have less IB than the
AD705, the BiFET’s input current will increase to a level of
several nA at +125°C. Superbeta bipolar technology also per-
mits the AD705 to achieve the microvolt offset voltage and low
noise characteristics of a precision bipolar input amplifier.
The AD705 is a high quality replacement for the industry-
standard OP07 amplifier while drawing only one sixth of its
power supply current. Since it has only 1/20th the input bias
current of an OP07, the AD705 can be used with much higher
source impedances, while providing the same level of dc preci-
sion. In addition, since the input bias currents are at picoAmp
CONNECTION DIAGRAM
Plastic Mini-DIP (N)
Cerdip (Q) and
Plastic SOIC (R) Packages
OFFSET
NULL
1
–IN 2
+IN 3
V– 4
TOP VIEW
AD705
8
OFFSET
NULL
7 V+
6 OUTPUT
5
OVER
COMP
levels, the commonly used “balancing” resistor (connected be-
tween the noninverting input of a bipolar op amp and ground) is
not required.
The AD705 is an excellent choice for use in low frequency ac-
tive filters in 12- and 14-bit data acquisition systems, in preci-
sion instrumentation and as a high quality integrator.
The AD705 is internally compensated for unity gain and is
available in five performance grades. The AD705J and AD705K
are rated over the commercial temperature range of 0°C to
+70°C. The AD705A and AD705B are rated over the industrial
temperature range of –40°C to +85°C. The AD705T is rated
over the military temperature range of –55°C to +125°C and is
available processed to MIL-STD-883B, Rev. C.
The AD705 is offered in three varieties of 8-pin package: plastic
DIP, hermetic cerdip and surface mount (SOIC). “J” grade
chips are also available.
PRODUCT HIGHLIGHTS
1. The AD705 is a low drift op amp that offers BiFET level
input bias currents, yet has the low IB drift of a bipolar ampli-
fier. It upgrades the performance of circuits using op amps
such as the LT1012.
2. The combination of Analog Devices’ advanced superbeta
processing technology and factory trimming provides both
low drift and high dc precision.
3. The AD705 can be used in applications where a chopper am-
plifier would normally be required but without the chopper’s
inherent noise and other problems.
REV. B
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 implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703




AD705 pdf, 반도체, 판매, 대치품
AD705–Typical Characteristics (@ +25؇C, VS = ؎15 V, unless otherwise noted)
100
SAMPLE SIZE: 610
80
200
SAMPLE SIZE:
1040
160
200
160
SAMPLE SIZE: 510
60 120 120
40 80 80
20 40 40
0
– 80 –60 – 40 – 20 0 +20 +40 +60 +80
INPUT OFFSET VOLTAGE – Microvolts
Figure 1. Typical Distribution of
Input Offset Voltage
0
–120
–60
0 +60 +120
INPUT BIAS CURRENT – Picoamperes
Figure 2. Typical Distribution of
Input Bias Current
0
–120
–60
0 +60 +120
INPUT OFFSET CURRENT – Picoamperes
Figure 3. Typical Distribution of
Input Offset Current
+VS
–0.5
–1.0
–1.5
+1.5
+1.0
+0.5
–VS
0
5 10 15
SUPPLY VOLTAGE – ±Volts
20
Figure 4. Input Common-Mode
Voltage Range vs. Supply Voltage
35
30
25
20
15
10
5
0
1k
10k 100k
FREQUENCY – Hz
1M
Figure 5. Large Signal Frequency
Response
100
SOURCE RESISTANCE
MAY BE EITHER BALANCED
OR UNBALANCED
10
1.0
0.1
1k
10k 100k 1M
10M
SOURCE RESISTANCE –
100M
Figure 6. Offset Voltage Drift vs.
Source Resistance
50
SAMPLE SIZE: 85
–55°C TO +125°C
40
30
20
10
0
–0.4 –0.2
0 +0.2 +0.4
OFFSET VOLTAGE DRIFT – µV/°C
Figure 7. Typical Distribution of
Offset Voltage Drift
4
3
2
1
0
01 2
34
WARM-UP TIME IN MINUTES
5
Figure 8. Change in Input Offset
Voltage vs. Warm-Up Time
60
40
20
POSITIVE IB
0
–20
NEGATIVE IB
–40
–60
–15
–10 –5 0 +5 +10 +15
COMMON MODE VOLTAGE – Volts
Figure 9. Input Bias Current vs.
Common-Mode Voltage
–4– REV. B

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AD705 전자부품, 판매, 대치품
5µs
100
90
10
0%
20mV
Figure 22d. Unity Gain Inverter Small Signal
Pulse Response C, = 1000 pF
10pF*
SQUARE WAVE
INPUT
5k
VIN
10k
+VS
0.1µF
27
AD705
3
4
5
6
–VS 0.1µF
VOUT
*RESPONSE IS
NEARLY IDENTICAL
FOR CAPACITANCE
VALUES OF 0 TO 100pF
4.1nF
Figure 23a. Follower Connected
in Feed-Forward Mode
5V
100
90
5µs
INPUT
10
0%
5V
OUTPUT
Figure 23b. Follower Feed-Forward
Pulse Response
VOS
ADJUST
20k
+VS
1
28
7
AD705
6
0.1µF
5
34
OVERCOMPENSATION
CAPACITOR
0.1µF
–VS
Figure 24. Offset Null and Overcompensation
Connections
AD705
A High Performance Differential Amplifier Circuit
Figure 25 shows a high input impedance, differential amplifier
circuit that features a high common-mode voltage, and which
operates at low power. Table I details its performance with
changes in gain. To optimize the common-mode rejection of
this circuit at low frequencies and dc, apply a 1 volt, 1 Hz sine
wave to both inputs. Measuring the output with an oscilloscope,
adjust trimming potentiometer R6 for minimum output. For the
best CMR at higher frequencies, capacitor C2 should be replaced
with a 1.5 pF to 20 pF trimmer capacitor.
Both the IC socket and any standoffs at the op amp’s input ter-
minals should be made of Teflon* to maintain low input current
drift over temperature.
*Teflon is a registered trademark of E.I. DuPont, Co.
C1
5pF
R1
100M
VIN–
SOURCE
R1'
100M
VIN+
GND
R2
10M
+VS
27
AD705
34
–VS
R2'
10M
C2
5pF
R3
200k
R5*
0.1µF
R4*
6
VOUT
0.1µF
DC CMR
ADJUST
R6
500k
CIRCUIT
GAIN,
G
=
R2+R3
R1
(1+
R5
R4
)
VOUT = G (VIN– – VIN+)
COMMON MODE INPUT RANGE =
10 (VS – 1.5V) FOR VS = ±15V,
VCM RANGE = ±135V
RESISTORS R1 AND R1', R2 AND
R2' ARE VICTOREEN MOX-200
1/4 WATT, 1% METAL OXIDE.
*SEE TABLE I
WARNING: POTENTIAL DANGER FROM HIGH SOURCE VOLTAGE.
THIS DIFFERENTIAL AMPLIFIER DOES NOT PROVIDE GALVANIC
ISOLATION. INPUT SOURCE MUST BE REFERRED TO THE SAME
GROUND CONNECTION AS THIS AMPLIFIER.
Figure 25. A High Performance Differentials
Amplifier Circuit
Table I. Typical Performance of Differential Amplifier
Circuit Operating at Various Gains
Circuit R4 R5 Trimmed RTI Average Circuit
Gain () () DC CMR Drift TC Bandwidth
(dB)
(V/؇C)
–3 dB
1 1.13 k10 kΩ ≥85
10 100 9.76 kΩ ≥85
100 10.2 10 kΩ ≥85
30
30
30
4.4 kHz
2.8 kHz
930 Hz
REV. B
–7–

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