Datasheet AD8641, AD8642, AD8643 (Analog Devices)

Low Power, Rail-to-Rail Output, Precision JFET Amplifiers Data Sheet AD8641 /AD8642/ AD8643 FEATURES PIN CONFIGURATIONS Low supply current: 250 μA max OUT 1 5 VCC Very low input bias current: 1 pA max AD8641 Low offset voltage: 750 μV max VEE 2 TOP VIEW (Not to Scale) Single-supply operation: 5 V to 26 V +IN 3 4 –IN Dual-supply operation: ±2.5 V to ±13 V
05072-101
Rail-to-rail output
Figure 1. 5-Lead SC70 (KS-5)
Unity-gain stable NIC 1 8 NIC No phase reversal –IN 2 AD8641 7 VCC SC70 package +IN 3 TOP VIEW 6 OUT (Not to Scale) VEE 4 5 NIC APPLICATIONS
02 1 2- 07
NIC = NO INTERNAL CONNECTION. Line-/battery-powered instruments
05 Figure 2. 8-Lead SOIC (R-8)
Photodiode amplifiers Precision current sensing OUT A 1 8 V+ Medical instrumentation –IN A 2 AD8642 7 OUT B Industrial controls +IN A 3 TOP VIEW 6 –IN B
05
(Not to Scale)
1 2-
Precision filters V– 4 5 +IN B
07 05
Portable audio
Figure 3. 8-Lead SOIC (R-8)
ATE OUT A 1 8 V+ GENERAL DESCRIPTION –IN A AD8642 2 7 OUT B TOP VIEW +IN A 3 6 –IN B
The AD8641/AD8642/AD8643 are low power, precision JFET
(Not to Scale) V– 4 5 +IN B
input amplifiers featuring extremely low input bias current and 05072-064 Figure 4. 8-Lead MSOP (RM-8) 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
OUT A 1 14 OUT D
complementary metal-oxide semiconductor digital-to-analog
–IN A 2 13 –IN D
converters (CMOS DACs), ASICs, and other wide output swing
+IN A 3 12 +IN D AD8643
devices in single-supply systems. The outputs remain stable
V+ 4 TOP VIEW 11 V– (Not to Scale)
with capacitive loads of more than 500 pF.
+IN B 5 10 +IN C –IN B 6 9 –IN C
The AD8641/AD8642/AD8643 are suitable for applications
OUT B 7 8 OUT C
utilizing multichannel boards that require low power to manage 05072-103 heat. Other applications include photodiodes, ATE reference Figure 5. 14-Lead SOIC (R-14) level drivers, battery management, and industrial controls.
A PIN 1 T T D C C INDICATOR
The AD8641/AD8642/AD8643 are fully specified over the
NI OU OU NI 6 5 4 3 1 1 1 1
extended industrial temperature range of −40°C to +125°C. The AD8641 is available in 5-lead SC70 and 8-lead SOIC lead-free
–IN A 1 12 –IN D
packages. The AD8642 is available in 8-lead MSOP and 8-lead
+IN A 2 11 +IN D AD8643
SOIC lead-free packages. The AD8643 is available in 14-lead
V+ 3 TOP VIEW 10 V–
SOIC and 16-lead, 3 mm × 3 mm, LFCSP lead-free packages.
+IN B 4 9 +IN C 5 6 7 8 N B T B T C N C –I –I OU OU NOTES
-104
1. NIC = NO INTERNAL CONNECTION.
72
2. EXPOSED PAD SHOULD BE CONNECTED TO V+.
050 Figure 6. 16-Lead LFCSP (CP-16-27) (Not Drawn to Scale)
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Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION PIN CONFIGURATIONS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ELECTRICAL CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION TYPICAL PERFORMANCE CHARACTERISTICS OUTLINE DIMENSIONS ORDERING GUIDE