AD8643_15 Datasheet, PDF (1/16 Pages) Analog Devices – Low Power, Rail-to-Rail Output, Precision

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
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)
NC 1
–IN 2
+IN 3
VEE 4
AD8641
TOP VIEW
(Not to Scale)
8 NC
7 VCC
6 OUT
5 NC
NC = NO CONNECT
Figure 2. 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 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)
–IN A 1
+IN A 2
V+ 3
+IN B 4
PIN 1
INDICATOR
AD8643
TOP VIEW
12 –IN D
11 +IN D
10 V–
9 +IN C
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.
NOTES
1. NC = NO CONNECT.
2. EXPOSED PAD SHOULD BE CONNECTED TO V+.
Figure 6. 16-Lead LFCSP (CP-16) (Not Drawn to Scale)
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