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PDF OP747 Data sheet ( Hoja de datos )
| Número de pieza | OP747 | |
| Descripción | (OP7x7) Precision Micropower Single-Supply Operational Amplifiers | |
| Fabricantes | Analog Devices | |
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a
Precision Micropower
Single-Supply Operational Amplifiers
OP777/OP727/OP747
FEATURES
Low Offset Voltage: 100 V Max
Low Input Bias Current: 10 nA Max
Single-Supply Operation: 2.7 V to 30 V
Dual-Supply Operation: ؎1.35 V to ؎15 V
Low Supply Current: 300 A/Amp Max
Unity Gain Stable
No Phase Reversal
APPLICATIONS
Current Sensing (Shunt)
Line or Battery-Powered Instrumentation
Remote Sensors
Precision Filters
OP727 SOIC Pin-Compatible with LT1013
GENERAL DESCRIPTION
The OP777 , OP727 , and OP747 are precision single , dual,
and quad rail-to-rail output single- supply amplifiers featuring
micropower operation and rail-to-rail output ranges. These
amplifier sprovideimprovedperformanceovertheindustry -standard
OP07 with ± 15 V supplies , and offer the further advantage of true
single -supply operation down to 2.7 V , and smaller package
options than any other high-voltage precision bipolar amplifier.
Outputs are stable with capacitive loads of over 500 pF. Supply
current is less than 300 µA per amplifier at 5 V. 500 Ω series resis-
tors protect the inputs, allowing input signal levels several volts above
the positive supply without phase reversal.
Applications for these amplifiers include both line-powered and
portable instrumentation, remote sensor signal conditioning, and
precision filters.
The OP777, OP727, and OP747 are specified over the extended
industrial (–40°C to +85°C) temperature range. The OP777,
single, is available in 8-lead MSOP and 8-lead SOIC packages.
The OP747, quad, is available in 14-lead TSSOP and narrow
14-lead SO packages.Surface-mountdevicesinTSSOPand MSOP
packages are available in tape and reel only.
The OP727, dual, is available in 8-lead TSSOP and 8-lead
SOIC packages. The OP727 8-lead SOIC pin configuration
differs from the standard 8-lead operational amplifier pinout.
FUNCTIONAL BLOCK DIAGRAMS
8-Lead MSOP
(RM-8)
14-Lead SOIC
(R-14)
NC 1
8 NC
؊IN OP777 V+
؉IN OUT
V؊ 4
5 NC
NC = NO CONNECT
8-Lead SOIC
(R-8)
OUT A 1
14 OUT D
–IN A 2
13 –IN D
؉IN A 3
12 ؉IN D
OP747
V؉ 4 TOP VIEW 11 V–
؉IN B 5 (Not to Scale) 10 ؉IN C
–IN B 6
9 –IN C
OUT B 7
8 OUT C
NC 1
؊IN 2
+IN 3
V؊ 4
OP777
8 NC
7 V+
6 OUT
5 NC
NC = NO CONNECT
8-Lead TSSOP
(RU-8)
OUT A 1
8 V؉
–IN A 2 OP727 7 OUT B
TOP VIEW
؉IN A 3 (Not to Scale) 6 –IN B
V– 4
5 ؉IN B
14-Lead TSSOP
(RU-14)
OUT A 1
14 OUT D
–IN A 2
13 –IN D
؉IN A 3
12 ؉IN D
OP747
V؉ 4 TOP VIEW 11 V–
؉IN B 5 (Not to Scale) 10 ؉IN C
–IN B 6
9 –IN C
OUT B 7
8 OUT C
8-Lead SOIC
(R-8)
؉IN A 1
8 –IN A
V– 2 OP727 7 OUT A
TOP VIEW
؉IN B 3 (Not to Scale) 6 V؉
–IN B 4
5 OUT B
NOTE: THIS PIN CONFIGURATION DIFFERS
FROM THE STANDARD 8-LEAD
OPERATIONAL AMPLIFIER PINOUT.
REV. C
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 that
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: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
1 page  
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Typical Performance Characteristics–OP777/OP727/OP747
220
200
VSY = ؎15V
VCM = 0V
180 TA = 25؇C
160
140
120
100
80
60
40
20
0
؊100 ؊80؊60 ؊40؊20 0 20 40 60 80 100
OFFSET VOLTAGE – V
TPC 1. OP777 Input Offset Voltage
Distribution
220
VSY = 5V
200 VCM = 2.5V
180 TA = 25؇C
160
140
120
100
80
60
40
20
0
؊100 ؊80؊60 ؊40؊20 0 20 40 60 80 100
OFFSET VOLTAGE – V
TPC 2. OP777 Input Offset Voltage
Distribution
30
VSY = ؎15V
25
VCM = 0V
TA = ؊40؇C TO +85؇C
20
15
10
5
0
0 0.2 0.4 0.6 0.8 1.0 1.2
INPUT OFFSET DRIFT – V/؇C
TPC 3. OP777 Input Offset Voltage
Drift Distribution
200
180
VSY = ؎15V
VCM = 0V
160 TA = –40؇C TO +85؇C
140
120
100
80
60
40
20
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
TCVOS – V/؇C
TPC 4. OP727/OP747 Input Offset
Voltage Drift (TCVOS Distribution)
600
VSY = ؎15V
VCM = 0V
500 TA = 25؇C
400
300
200
100
0
–120 –80 –40
0
40 80 120
V
TPC 5. OP747 Input Offset Voltage
Distribution
600
VSY = 5V
500
VCM = 2.5V
TA = 25؇C
400
300
200
100
0
–120
–80 –40 0 40 80
OFFSET VOLTAGE – V
120
TPC 6. OP747 Input Offset Voltage
Distribution
600
VSY = 5V
500
VCM = 2.5V
TA = 25؇C
400
300
200
100
0
؊140 ؊120 ؊80 ؊40 0
40 80
OFFSET VOLTAGE – V
120
TPC 7. OP727 Input Offset Voltage
Distribution
600
VSY = ؎15V
VCM = 0V
500 TA = 25؇C
400
300
200
100
0
؊140 ؊120 ؊80 ؊40 0
40 80
OFFSET VOLTAGE – V
120
TPC 8. OP727 Input Offset Voltage
Distribution
30
VSY = ؎15V
25
VCM = 0V
TA = 25؇C
20
15
10
5
0
34 5 678
INPUT BIAS CURRENT – nA
TPC 9. Input Bias Current
Distribution
REV. C
–5–
5 Page 
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Input Over Voltage Protection
When the input of an amplifier is more than a diode drop below
VEE, or above V CC, large currents will flow from the substrate
(V–) or the positive supply (V+), respectively, to the input pins
which can destroy the device. In the case of OP777/OP727/
OP747, differential voltages equal to the supply voltage will not
cause any problem (see Figure 3). OP777/OP727/OP747 has
built- in 500 Ω internal current limiting resistors, in series with the
inputs, to minimize the chances of damage. It is a good practice to
keep the current flowing into the inputs below 5 mA. In this con-
text it should also be noted that the high breakdown of the input
transistors removes the necessity for clamp diodes between the
inputs of the amplifier, a feature that is mandatory on many preci-
sion op amps. Unfortunately, such clamp diodes greatly interfere
with many application circuits such as precision rectifiers and
comparators. The OP777/OP727/OP747 series is free from such
limitations.
30V
V p-p = 32V
OP777/
OP727/
OP747
Figure 3a. Unity Gain Follower
VSY = ؎15V
VIN
VOUT
OP777/OP727/OP747
VSY = ؎15V
VIN
VOUT
TIME – 400s/DIV
Figure 4. No Phase Reversal
Output Stage
The CMOS output stage has excellent (and fairly symmetric) output
drive and with light loads can actually swing to within 1 mV of both
supply rails. This is considerably better than similar amplifiers
featuring (so-called) rail-to-rail bipolar output stages. OP777/
OP727/OP747 is stable in the voltage follower configuration and
responds to signals as low as 1 mV above ground in single supply
operation.
2.7V TO 30V
VIN = 1mV
VOUT = 1mV
OP777/
OP727/
OP747
Figure 5. Follower Circuit
TIME – 400s/DIV
Figure 3b. Input Voltage Can Exceed the Supply Voltage
Without Damage
Phase Reversal
Many amplifiers misbehave when one or both of the inputs are
forced beyond the input common-mode voltage range. Phase
reversal is typified by the transfer function of the amplifier effectively
reversing its transfer polarity. In some cases this can cause lockup in
servo systems and may cause permanent damage or nonrecoverable
parameter shifts to the amplifier. Many amplifiers feature compensa-
tion circuitry to combat these effects, but some are only effective for
the inverting input. Additionally, many of these schemes only work
for a few hundred millivolts or so beyond the supply rails. OP777/
OP727/OP747 has a protection circuit against phase reversal
when one or both inputs are forced beyond their input common-
mode voltage range. It is not recommended that the parts be
continuously driven more than 3 V beyond the rails.
1.0mV
TIME – 10s/DIV
Figure 6. Rail-to-Rail Operation
Output Short Circuit
The output of the OP777/OP727/OP747 series amplifier is protected
from damage against accidental shorts to either supply voltage,
provided that the maximum die temperature is not exceeded on a
long-term basis (see Absolute Maximum Rating section). Current of
up to 30 mA does not cause any damage.
A Low-Side Current Monitor
In the design of power supply control circuits, a great deal of design
effort is focused on ensuring a pass transistor’s long-term reliability
over a wide range of load current conditions. As a result, monitoring
REV. C
–11–
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