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AD8657 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8657
Beschreibung Micropower CMOS RRIO Operational Amplifier
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 24 Seiten
AD8657 Datasheet, Funktion
Data Sheet
FEATURES
Micropower at high voltage (18 V): 22 μA maximum
Low offset voltage: 350 µV maximum
Low input bias current: 20 pA maximum
Gain bandwidth product: 230 kHz at AV = 100 typical
Unity-gain crossover: 230 kHz
−3 dB closed-loop bandwidth: 305 kHz
Single-supply operation: 2.7 V to 18 V
Dual-supply operation: ±1.35 V to ±9 V
Unity-gain stable
Excellent electromagnetic interference immunity
APPLICATIONS
Portable operating systems
Current monitors
4 mA to 20 mA loop drivers
Buffer/level shifting
Multipole filters
Remote/wireless sensors
Low power transimpedance amplifiers
GENERAL DESCRIPTION
The AD8657/AD8659 are dual and quad micropower, precision,
rail-to-rail input/output amplifiers optimized for low power and
wide operating supply voltage range applications.
The AD8657/AD8659 operate from 2.7 V to 18 V with a typical
quiescent supply current of 18 μA. The devices use the Analog
Devices, Inc., patented DigiTrim® trimming technique, which
achieves low offset voltage. The AD8657/AD8659 also have
high immunity to electromagnetic interference.
The combination of low supply current, low offset voltage, very
low input bias current, wide supply range, and rail-to-rail input
and output make the AD8657/AD8659 ideal for current
monitoring in process and motor control applications. The
combination of precision specifications makes these devices
ideal for dc gain and buffering of sensor front ends or high
impedance input sources in wireless or remote sensors or
transmitters.
The AD8657/AD8659 are specified over the extended industrial
temperature range (−40°C to +125°C). The AD8657 is available in
an 8-lead MSOP package and an 8-lead LFCSP package; the
AD8659 is available in a 14-lead SOIC package and 16-lead
LFCSP package.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
22 µA, RRIO, CMOS,18 V
Operational Amplifiers
AD8657/AD8659
PIN CONNECTION DIAGRAMS
OUT A 1
–IN A 2
+IN A 3
V– 4
AD8657
TOP VIEW
(Not to Scale)
8 V+
7 OUT B
6 –IN B
5 +IN B
Figure 1. AD8657 Pin Configuration, 8-Lead MSOP
OUT A 1
–IN A 2
+IN A 3
V– 4
AD8657
TOP VIEW
(Not to Scale)
8 V+
7 OUT B
6 –IN B
5 +IN B
NOTES
1. CONNECT THE EXPOSED PAD TO V– OR
LEAVE IT UNCONNECTED.
Figure 2. AD8657 Pin Configuration, 8-Lead LFCSP
Note: For AD8659 pin connections and for more information
about the pin connections for these products, see the Pin
Configurations and Function Descriptions section.
60
50
VSY = 2.7V
VSY = 18V
40
30
20
10
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
Figure 3. AD8657, Supply Current vs. Temperature
Table 1. Precision Micropower Op Amps (<250 µA)
Supply Voltage 5 V
12 V to 16 V 36 V
Single
AD8538
OP196
AD8603
ADA4051-1
Dual
AD8539
AD8657
AD8622
AD8607
ADA4091-2
ADA4051-2
ADA4096-2
Quad
AD8609
AD8659
AD8624
ADA4091-4
ADA4096-4
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2011–2012 Analog Devices, Inc. All rights reserved.
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AD8657 Datasheet, Funktion
AD8657/AD8659
ABSOLUTE MAXIMUM RATINGS
Table 5.
Parameter
Supply Voltage
Input Voltage
Input Current1
Differential Input Voltage
Output Short-Circuit
Duration to GND
Temperature Ranges
Storage
Operating
Junction
Lead Temperature
(Soldering, 60 sec)
Rating
20.5 V
(V−) − 300 mV to (V+) + 300 mV
±10 mA
±VSY
Indefinite
−65°C to +150°C
−40°C to +125°C
−65°C to +150°C
300°C
1 The input pins have clamp diodes to the power supply pins. Limit the input
current to 10 mA or less whenever input signals exceed the power supply
rail by 0.3 V.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Data Sheet
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages using a
standard 4-layer JEDEC board. The exposed pad (LFCSP
packages only) is soldered to the board.
Table 6. Thermal Resistance
Package Type
8-Lead MSOP (RM-8)
8-Lead LFCSP (CP-8-11)
14-Lead SOIC (R-14)
16-Lead LFCSP (CP-16-20)
θJA
142
75
115
52
θJC
45
12
36
13
Unit
°C/W
°C/W
°C/W
°C/W
ESD CAUTION
Rev. B | Page 6 of 24
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AD8657 pdf, datenblatt
AD8657/AD8659
2.700
2.699
RL = 1MΩ
2.698
2.697
RL = 100kΩ
2.696
VSY = 2.7V
2.695
–50
–25
0 25 50 75
TEMPERATURE (°C)
100
Figure 26. Output Voltage (VOH) vs. Temperature
125
12
VSY = 2.7V
10
8
6
4
RL = 100kΩ
2
RL = 1MΩ
0
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
Figure 27. Output Voltage (VOL) vs. Temperature
125
35
VSY = 2.7V
30
25
20
15
10
–40°C
+25°C
5 +85°C
+125°C
0
0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
VCM (V)
Figure 28. Supply Current vs. Common-Mode Voltage
Data Sheet
18.000
17.995
RL = 1MΩ
17.990
17.985
RL = 100kΩ
17.980
VSY = 18V
17.975
–50
–25
0 25 50 75
TEMPERATURE (°C)
100
Figure 29. Output Voltage (VOH) vs. Temperature
125
12
VSY = 18V
10
RL = 100kΩ
8
6
4
2
RL = 1MΩ
0
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
Figure 30. Output Voltage (VOL) vs. Temperature
125
35
VSY = 18V
30
25
20
15
10
–40°C
+25°C
5 +85°C
+125°C
0
0 3 6 9 12 15 18
VCM (V)
Figure 31. Supply Current vs. Common-Mode Voltage
Rev. B | Page 12 of 24
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