AD8641 Analog Devices, AD8641 Datasheet

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AD8641

Manufacturer Part Number
AD8641
Description
Low Power, Rail - to - Rail Output Precision JFET Amplifier in 5-lead SC70 and 8-lead SOIC lead-free packages
Manufacturer
Analog Devices
Datasheet

Specifications of AD8641

Vcc-vee
5V to 26V
Isy Per Amplifier
290µA
Packages
SC70,SOIC
-3db Bandwidth
3.5MHz
Slew Rate
3V/µs
Vos
50µV
Ib
0.25pA
# Opamps Per Pkg
1
Input Noise (nv/rthz)
27.5nV/rtHz

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Data Sheet
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
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.
Rev. E
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.
Trademarks and registered trademarks are the property of their respective owners.
Low Power, Rail-to-Rail Output, Precision
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
NOTES
1. NC = NO CONNECT.
2. EXPOSED PAD SHOULD BE CONNECTED TO V+.
Figure 6. 16-Lead LFCSP (CP-16) (Not Drawn to Scale)
AD8641/AD8642/AD8643
OUT A
OUT A
OUT B
OUT A
–IN A
+IN A
–IN A
+IN A
+IN B
–IN B
PIN CONFIGURATIONS
©2004–2011 Analog Devices, Inc. All rights reserved.
+IN A
VEE
–IN A
+IN B
–IN A
+IN A
–IN
+IN
NC
Figure 4. 8-Lead MSOP (RM-8)
V+
V–
OUT
Figure 5. 14-Lead SOIC (R-14)
VEE
V–
Figure 1. 5-Lead SC70 (KS-5)
V+
+IN
Figure 2. 8-Lead SOIC (R-8)
Figure 3. 8-Lead SOIC (R-8)
1
2
3
4
1
2
3
4
1
2
3
4
5
6
7
1
2
3
4
1
2
3
4
NC = NO CONNECT
1
2
3
(Not to Scale)
(Not to Scale)
(Not to Scale)
(Not to Scale)
(Not to Scale)
AD8641
TOP VIEW
AD8643
TOP VIEW
AD8642
TOP VIEW
AD8642
TOP VIEW
AD8641
TOP VIEW
AD8643
TOP VIEW
PIN 1
INDICATOR
JFET Amplifiers
14
13
12
11
10
8
7
6
5
9
8
5
4
8
7
6
5
8
7
6
5
V+
OUT B
–IN B
+IN B
VCC
–IN
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
NC
VCC
OUT
NC
V+
OUT B
–IN B
+IN B
12
11
10
9
–IN D
+IN D
V–
+IN C
www.analog.com

Related parts for AD8641

AD8641 Summary of contents

Page 1

... 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 × ...

Page 2

... AD8641/AD8642/AD8643 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Pin Configurations ........................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Electrical Characteristics............................................................. 3 REVISION HISTORY 9/11—Rev Rev. E Changes to Thermal Resistance Section........................................ 5 7/11—Rev Rev. D Changes to Figure 6.......................................................................... 1 11/10—Rev Rev. C Changes to Figure 6.......................................................................... 1 Added Thermal Resistance Section and Table 4 .......................... 5 Updated Outline Dimensions ...

Page 3

... mA, –40°C to +125° OUT PSRR –40°C < T < +125° GBP AD8641, AD8642 AD8643 Ø p 0 kHz kHz N Rev Page AD8641/AD8642/AD8643 Min Typ Max ...

Page 4

... AD8641/AD8642/AD8643 V = ± =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 ...

Page 5

... Package Type −65°C to +150°C 5-Lead SC70 (KS) −40°C to +125°C 8-Lead SOIC (R) 8-Lead MSOP (RM) −65°C to +150°C 14-Lead SOIC (R) 300°C 16-Lead LFCSP (CP) ESD CAUTION Rev Page AD8641/AD8642/AD8643 θ θ Unit JA JC 430 149 °C/W 121 43 °C/W ...

Page 6

... AD8641/AD8642/AD8643 TYPICAL PERFORMANCE CHARACTERISTICS 80 = ±13V (mV) OS Figure 7. Input Offset Voltage OFFSET VOLTAGE (μV/°C) Figure 8. Offset Voltage Drift 70 = ± 2. (mV) OS Figure 9. Input Offset Voltage ...

Page 7

... CM 1000 100 Rev Page AD8641/AD8642/AD8643 0.5 1.0 1.5 2.0 V (V) CM Figure 16. Input Offset Voltage vs ±13V ±2. 0 LOAD RESISTANCE (kΩ) Figure 17. Open-Loop Gain vs. Load Resistance ...

Page 8

... AD8641/AD8642/AD8643 600 = ±13V V SY 500 400 300 200 100 0 100kΩ –100 –200 –300 10kΩ 1kΩ –400 –500 –600 –15 –10 – OUTPUT VOLTAGE (V) Figure 19. Input Error Voltage vs. Output Voltage for Resistive Loads 250 = ± 200 SY 150 R = 1kΩ ...

Page 9

... V SY 120 100 –20 –40 –60 10M 1k Rev Page AD8641/AD8642/AD8643 ± = 13V 10k 100k 1M FREQUENCY (Hz) Figure 28. CMRR vs. Frequency = 5V 10k 100k 1M FREQUENCY (Hz) Figure 29. CMRR vs. Frequency ± = 13V +PSRR –PSRR 10k 100k 1M FREQUENCY (Hz) Figure 30 ...

Page 10

... AD8641/AD8642/AD8643 140 120 100 +PSRR –PSRR 20 0 –20 –40 –60 1k 10k 100k FREQUENCY (Hz) Figure 31. PSRR vs. Frequency 1000 = ± 13V +100 100 + 0.1 0.01 1k 10k 100k 1M FREQUENCY (Hz) Figure 32. Output Impedance vs. Frequency 1000 +100 100 + ...

Page 11

... A CH1 3 4 –20.0V 5 0.004 = ±2. +1M CH1 p-p = 4.06V 0.001 0.0001 0.00001 0.000001 A CH1 –20. Rev Page AD8641/AD8642/AD8643 = ±13V 100 1k FREQUENCY (Hz) Figure 40. Voltage Noise Density 100 1k FREQUENCY (Hz) Figure 41. Voltage Noise Density = ±13V p-p INPUT LOAD = 100kΩ ...

Page 12

... AD8641/AD8642/AD8643 –40 20kΩ –50 2kΩ – – – –70 2kΩ 2kΩ –80 –90 –100 –110 V = 4.5V p-p IN –120 –130 –140 p-p IN –150 –160 20 100 1k FREQUENCY (Hz) Figure 43. Channel Separation V = 18V p-p IN 10k 100k Rev Page Data Sheet ...

Page 13

... CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. Figure 45. 8-Lead Standard Small Outline Package [SOIC_N] (R-8) Dimensions shown in millimeters and (inches) Rev Page AD8641/AD8642/AD8643 0.46 0.36 0.26 0.50 (0.0196) 45° 0.25 (0.0099) 1.27 (0.0500) ...

Page 14

... AD8641/AD8642/AD8643 IDENTIFIER 4.00 (0.1575) 3.80 (0.1496) 0.25 (0.0098) 0.10 (0.0039) COPLANARITY 0.10 PIN 1 INDICATOR 12° MAX 0.90 0.85 0.80 SEATING PLANE 3.20 3.00 2.80 5. 3.20 4.90 3.00 4.65 1 2.80 4 PIN 1 0.65 BSC 0.95 15° MAX 0.85 1.10 MAX 0.75 0.15 0.23 6° 0.40 0.05 0.09 0° 0.25 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 46. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters 8.75 (0.3445) 8.55 (0.3366 6.20 (0.2441 ...

Page 15

... AD8641AKSZ-REEL7 −40°C to +125°C AD8641AKSZ-REEL −40°C to +125°C AD8641ARZ −40°C to +125°C AD8641ARZ-REEL7 −40°C to +125°C AD8641ARZ-REEL −40°C to +125°C AD8642ARMZ −40°C to +125°C AD8642ARMZ-REEL −40°C to +125°C AD8642ARZ −40°C to +125°C AD8642ARZ-REEL7 − ...

Page 16

... AD8641/AD8642/AD8643 NOTES ©2004–2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05072-0-9/11(E) Rev Page Data Sheet ...

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