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AD8643 데이터시트 PDF




Analog Devices에서 제조한 전자 부품 AD8643은 전자 산업 및 응용 분야에서
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부품번호 AD8643 기능
기능 JFET Amplifiers
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AD8643 데이터시트, 핀배열, 회로
Data Sheet
Low Power, Rail-to-Rail Output, Precision
JFET Amplifiers
AD8641/AD8642/AD8643
FEATURES
Low supply current: 250 μA max
Very low input bias current: 1 pA max
Low offset voltage: 750 μV max
Single-supply operation: 5 V to 26 V
Dual-supply operation: ±2.5 V to ±13 V
Rail-to-rail output
Unity-gain stable
No phase reversal
SC70 package
APPLICATIONS
Line-/battery-powered instruments
Photodiode amplifiers
Precision current sensing
Medical instrumentation
Industrial controls
Precision filters
Portable audio
ATE
GENERAL DESCRIPTION
The AD8641/AD8642/AD8643 are low power, precision JFET
input amplifiers featuring extremely low input bias current and
rail-to-rail output. The ability to swing nearly rail-to-rail at the
input and rail-to-rail at the output enables designers to buffer
complementary metal-oxide semiconductor digital-to-analog
converters (CMOS DACs), ASICs, and other wide output swing
devices in single-supply systems. The outputs remain stable
with capacitive loads of more than 500 pF.
The AD8641/AD8642/AD8643 are suitable for applications
utilizing multichannel boards that require low power to manage
heat. Other applications include photodiodes, ATE reference
level drivers, battery management, and industrial controls.
The AD8641/AD8642/AD8643 are fully specified over the
extended industrial temperature range of −40°C to +125°C. The
AD8641 is available in 5-lead SC70 and 8-lead SOIC lead-free
packages. The AD8642 is available in 8-lead MSOP and 8-lead
SOIC lead-free packages. The AD8643 is available in 14-lead
SOIC and 16-lead, 3 mm × 3 mm, LFCSP lead-free packages.
PIN CONFIGURATIONS
OUT 1
5 VCC
AD8641
VEE 2 TOP VIEW
(Not to Scale)
+IN 3
4 –IN
Figure 1. 5-Lead SC70 (KS-5)
NIC 1
8 NIC
–IN 2 AD8641 7 VCC
+IN 3 TOP VIEW 6 OUT
(Not to Scale)
VEE 4
5 NIC
NIC = NO INTERNAL CONNECTION.
Figure 2. 8-Lead SOIC (R-8)
OUT A 1
8 V+
–IN A 2 AD8642 7 OUT B
+IN A 3 TOP VIEW 6 –IN B
(Not to Scale)
V– 4
5 +IN B
Figure 3. 8-Lead SOIC (R-8)
OUT A 1
–IN A 2
+IN A 3
V– 4
AD8642
TOP VIEW
(Not to Scale)
8 V+
7 OUT B
6 –IN B
5 +IN B
Figure 4. 8-Lead MSOP (RM-8)
OUT A 1
14 OUT D
–IN A 2
13 –IN D
+IN A 3 AD8643 12 +IN D
V+ 4 TOP VIEW 11 V–
(Not to Scale)
+IN B 5
10 +IN C
–IN B 6
9 –IN C
OUT B 7
8 OUT C
Figure 5. 14-Lead SOIC (R-14)
PIN 1
INDICATOR
–IN A 1
+IN A 2
V+ 3
+IN B 4
AD8643
TOP VIEW
12 –IN D
11 +IN D
10 V–
9 +IN C
Rev. F
Document Feedback
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
NOTES
1. NIC = NO INTERNAL CONNECTION.
2. EXPOSED PAD SHOULD BE CONNECTED TO V+.
Figure 6. 16-Lead LFCSP (CP-16-27) (Not Drawn to Scale)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2004–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com




AD8643 pdf, 반도체, 판매, 대치품
AD8641/AD8642/AD8643
VS = ±13 V, VCM = 0 V, TA =25°C, unless otherwise noted.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Offset Voltage Drift
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Output Current
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Voltage Noise
Voltage Noise Density
Current Noise Density
Symbol
VOS
IB
IOS
CMRR
AVO
∆VOS/∆T
VOH
VOL
IOUT
PSRR
ISY
SR
GBP
Øm
eN p-p
eN
iN
Test Conditions/Comments
AD8643 LFCSP only
−40°C < TA < +125°C
−40°C < TA < +125°C
−40°C < TA < +125°C
VCM = −13 V to +10 V
RL = 10 kΩ, VO = −11 V to +11 V
−40°C < TA < +125°C
IL = 1 mA, −40°C to +125°C
IL = 1 mA, −40°C to +125°C
VS = ±2.5 V to ±13 V
−40°C < TA < +125°C
f = 0.1 Hz to 10 Hz
f = 1 kHz
f = 1 kHz
Data Sheet
Min
Typ Max
Unit
70 750
µV
1 mV
1.5 mV
0.25 1
pA
260 pA
0.5 pA
65 pA
−13 +10 V
90 107
dB
215 290
V/mV
2.5 µV/°C
+12.95
V
+12.94
V
−12.95 V
−12.94 V
±12 mA
90 107
dB
200 290
µA
330 µA
3 V/µs
3.5 MHz
60 Degrees
4.2 µV p-p
27.5 nV/√Hz
0.5 fA/√Hz
Rev. F | Page 4 of 15

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AD8643 전자부품, 판매, 대치품
Data Sheet
1000
VSY = ±13V
100
10
1
0.1
0 25 50 75 100 125 150
TEMPERATURE (°C)
Figure 13. Input Bias Current vs. Temperature
1.0
VSY = +5V OR ±5V
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
–5 –4 –3 –2 –1 0 1 2 3 4 5
VCM (V)
Figure 14. Input Bias Current vs. VCM
1000
VSY = ±13V
900
800
700
600
500
400
300
200
100
0
–100
–15 –13 –11 –9 –7 –5 –3 –1 0 1 3 5 7 9 11 13 15
VCM (V)
Figure 15. Input Offset Voltage vs. VCM
AD8641/AD8642/AD8643
500
VSY = 5V
400
300
200
100
0
–100
–200
–300
–400
–500
0
0.5 1.0 1.5 2.0 2.5
VCM (V)
Figure 16. Input Offset Voltage vs. VCM
10M
1M
100k
VSY = ±13V
VSY = ±2.5V
10k
0.1
1 10
LOAD RESISTANCE (k)
100
Figure 17. Open-Loop Gain vs. Load Resistance
1000
100
A
B
C
D
E
10
A. VSY = ±13V, VO = ±11V, RL = 10k
B. VSY = ±13V, VO = ±11V, RL = 2k
C. VSY = +5V, VO = +0.5V/+4.5V, RL = 10k
D. VSY = +5V, VO = +0.5V/+4.5V, RL = 2k
E. VSY = +5V, VO = +0.5V/+4.5V, RL = 600
1
–50 –30 –10 10 30 50 70 90
TEMPERATURE (°C)
110 130 150
Figure 18. Open-Loop Gain vs. Temperature
Rev. F | Page 7 of 15

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