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AD629 データシート(PDF) 3 Page - Analog Devices

部品番号 AD629
部品情報  High Common-Mode Voltage Difference Amplifier
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

AD629 データシート(HTML) 3 Page - Analog Devices

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REV. A
AD629
–3–
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage VS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±18 V
Internal Power Dissipation2
DIP (N) . . . . . . . . . . . . . . . . . . . . . . . . See Derating Curves
SOIC (R) . . . . . . . . . . . . . . . . . . . . . . . See Derating Curves
Input Voltage Range, Continuous . . . . . . . . . . . . . . . .
±300 V
Common-Mode and Differential, 10 sec . . . . . . . . . . .
±500 V
Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Pin 1, Pin 5 . . . . . . . . . . . . . . . . . . –VS – 0.3 V to +VS + 0.3 V
Maximum Junction Temperature . . . . . . . . . . . . . . . . . 150
°C
Operating Temperature Range . . . . . . . . . . –55
°C to +125°C
Storage Temperature Range . . . . . . . . . . . . –65
°C to +150°C
Lead Temperature Range (Soldering 60 sec) . . . . . . . . . 300
°C
NOTES
1Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent 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 effect device reliability.
2Specification is for device in free air: 8-Lead Plastic DIP,
θ
JA = 100
°C/W; 8-Lead
SOIC Package,
θ
JA = 155
°C/W.
AMBIENT TEMPERATURE – C
2.0
–50
1.5
1.0
0.5
0
8-LEAD MINI-DIP PACKAGE
–40 –30 –20 –10
0
102030
405060
708090
8-LEAD SOIC PACKAGE
TJ = 150 C
Figure 3. Derating Curve of Maximum Power Dissipation
vs. Temperature for SOIC and PDIP Packages
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD629 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
THEORY OF OPERATION
The AD629 is a unity gain differential-to-single-ended amplifier
(Diff Amp) that can reject extremely high common-mode
signals (in excess of 270 V with 15 V supplies). It consists of an
operational amplifier (Op Amp) and a resistor network.
In order to achieve high common-mode voltage range, an internal
resistor divider (Pin 3, Pin 5) attenuates the noninverting signal
by a factor of 20. Other internal resistors (Pin 1, Pin 2, and the
feedback resistor) restores the gain to provide a differential gain
of unity. The complete transfer function equals:
VOUT = V (+IN ) – V (–IN )
Laser wafer trimming provides resistor matching so that common-
mode signals are rejected while differential input signals are
amplified.
The op amp itself, in order to reduce output drift, uses super
beta transistors in its input stage The input offset current and
its associated temperature coefficient contribute no appreciable
output voltage offset or drift. This has the added benefit of
reducing voltage noise because the corner where 1/f noise becomes
dominant is below 5 Hz. In order to reduce the dependence of
gain accuracy on the op amp, the open-loop voltage gain of the
op amp exceeds 20 million, and the PSRR exceeds 140 dB.
1
2
3
4
8
7
6
5
21.1k
380k
380k
380k
20k
REF(–)
–IN
+IN
–VS
NC
+VS
OUTPUT
REF(+)
AD629
NC = NO CONNECT
Figure 4. Functional Block Diagram
ORDERING GUIDE
Temperature
Package
Package
Model
Range
Description
Option
AD629AR
–40
°C to +85°C
8-Lead Plastic SOIC
SO-8
AD629AR-REEL
1
–40
°C to +85°C
8-Lead Plastic SOIC
SO-8
AD629AR-REEL7
2
–40
°C to +85°C
8-Lead Plastic SOIC
SO-8
AD629BR
–40
°C to +85°C
8-Lead Plastic SOIC
SO-8
AD629BR-REEL
1
–40
°C to +85°C
8-Lead Plastic SOIC
SO-8
AD629BR-REEL7
2
–40
°C to +85°C
8-Lead Plastic SOIC
SO-8
AD629AN
–40
°C to +85°C
8-Lead Plastic DIP
N-8
AD629BN
–40
°C to +85°C
8-Lead Plastic DIP
N-8
NOTES
113" Tape and Reel of 2500 each
27" Tape and Reel of 1000 each


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