®
ISL28278, ISL28478
Data Sheet
July 11, 2007
FN6145.2
Dual and Quad Micropower Single Supply
Rail-to-Rail Input and Output (RRIO)
Op-Amp
The ISL28278 and ISL28478 are dual and quad channel
micropower operational amplifiers optimized for single
supply operation over the 2.4V to 5V range. They can be
operated from one lithium cell or two Ni-Cd batteries. For
equivalent performance in a single channel op-amp
reference EL8178.
These devices feature an Input Range Enhancement Circuit
(IREC) which enables them to maintain CMRR performance
for input voltages 10% above the positive supply rail and to
100mV below the negative supply. The output operation is
rail to rail.
The ISL28278 and ISL28478 draw minimal supply current
while meeting excellent DC-accuracy, AC-performance,
noise and output drive specifications. The ISL28278
contains a power down enable pin that reduces the power
supply current to typically 4µA in the disabled state.
Features
• Low power 120µA typical supply current (ISL28278)
• 225μV max offset voltage
• 30pA max input bias current
• 300kHz typical gain-bandwidth product
• 105dB typical PSRR
• 100dB typical CMRR
• Single supply operation down to 2.4V
• Input is capable of swinging above V+ and below V-
(ground sensing)
• Rail-to-rail input and output (RRIO)
• Enable Pin (ISL28278 only)
• Pb-free plus anneal available (RoHS compliant)
Applications
• Battery- or solar-powered systems
• 4mA to 25mA current loops
Pinouts
ISL28278 (16 LD QSOP)
TOP VIEW
NC
1
NC 2
OUT_A
3
-
+
IN-_A
4
IN+_A
5
EN_A
6
V- 7
NC
8
-
+
16
NC
15
V+
14
OUT_B
13 IN-_B
12
IN+_B
11
EN_B
10
NC
9
NC
• Handheld consumer products
• Medical devices
• Thermocouple amplifiers
• Photodiode pre-amps
• pH probe amplifiers
Ordering Information
PART NUMBER
(Note)
ISL28278FAZ*
ISL28478FAZ*
PART
MARKING
28278FAZ
28478FAZ
PACKAGE
(Pb-Free)
16 Ld QSOP
16 Ld QSOP
PKG.
DWG. #
MDP0040
MDP0040
ISL28478 (16 LD QSOP)
TOP VIEW
OUT_A
1
IN-_A 2
-
+
IN+_A
3
V+
4
IN+_B
5
IN-_B
6
OUT_B 7
NC
8
+
-
+
-
-
+
16
OUT_D
15
IN-_D
14 IN+_D
13
V-
12
IN+_C
11
IN-_C
10
OUT_C
9
NC
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations.
Intersil Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
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Copyright Intersil Americas Inc. 2006, 2007. All Rights Reserved
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