FEATURES
PIN CONFIGURATIONS
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
OUT 1
5
VCC
4
–IN
VEE 2
TOP VIEW
(Not to Scale)
+IN 3
05072-101
AD8641
Figure 1. 5-Lead SC70 (KS-5)
1
–IN
2
+IN
3
VEE
APPLICATIONS
8
AD8641
NIC
VCC
TOP VIEW
6 OUT
(Not to Scale)
4
5 NIC
7
NIC = NO INTERNAL CONNECTION.
Line-/battery-powered instruments
Photodiode amplifiers
Precision current sensing
Medical instrumentation
Industrial controls
Precision filters
Portable audio
ATE
05072-102
NIC
Figure 2. 8-Lead SOIC (R-8)
–IN A 2
8
AD8642
V+
OUT B
TOP VIEW
6 –IN B
(Not to Scale)
5 +IN B
V– 4
7
+IN A 3
05072-105
OUT A 1
Figure 3. 8-Lead SOIC (R-8)
8
OUT B
–IN B
+IN B
Figure 4. 8-Lead MSOP (RM-8)
OUT A 1
14
OUT D
–IN A 2
13
–IN D
12
+IN D
+IN A 3
V+ 4
+IN B 5
AD8643
TOP VIEW
11 V–
(Not to Scale)
10 +IN C
–IN B 6
9
–IN C
OUT B 7
8
OUT C
13 NIC
14 OUT D
PIN 1
INDICATOR
16 NIC
Figure 5. 14-Lead SOIC (R-14)
12 –IN D
–IN A 1
+IN A 2
AD8643
11 +IN D
V+ 3
TOP VIEW
10 V–
9
+IN C
NOTES
1. NIC = NO INTERNAL CONNECTION.
2. EXPOSED PAD SHOULD BE CONNECTED TO V+.
05072-104
–IN C 8
OUT C 7
+IN B 4
–IN B 5
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.
V– 4
15 OUT A
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.
TOP VIEW
(Not to Scale)
6
5
+IN A 3
OUT B 6
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.
AD8642
V+
7
–IN A 2
05072-064
OUT A 1
GENERAL DESCRIPTION
05072-103
Data Sheet
Low Power, Rail-to-Rail Output, Precision
JFET Amplifiers
AD8641/AD8642/AD8643
Figure 6. 16-Lead LFCSP (CP-16-27) (Not Drawn to Scale)
Rev. F
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