DATASHEET
ISL28288, ISL28488
Dual and Quad Micropower Single Supply Rail-to-Rail Input and Output (RRIO)
Op Amp
The ISL28288 and ISL28488 are dual and quad channel
micropower operational amplifiers optimized for single supply
operation over the 2.4V to 5.5V range. They can be operated
from one lithium cell or two Ni-Cd batteries. For equivalent
performance in a single channel op amp, reference EL8188.
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 ISL28288 and ISL28488 draw minimal supply current
while meeting excellent DC-accuracy, AC-performance, noise
and output drive specifications. The ISL28288 (10 Ld MSOP
only) contains a power-down enable pin that reduces the
power supply current to typically less than 4µA in the disabled
state.
FN6339
Rev 4.00
July 26, 2011
Features
• Low power 60µA typical supply current per amplifier
• 1.5mV max offset voltage
• 30pA max input bias current
• 250kHz 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 - ISL28288 10 Ld MSOP package option only
• Pb-free (RoHS compliant)
Related Literature
AN1344:
ISL2828xEVAL1Z Evaluation Board User’s Guide
Applications
• Battery- or solar-powered systems
• 4mA to 25mA current loops
• Handheld consumer products
• Medical devices
• Thermocouple amplifiers
• Photodiode pre-amps
• pH probe amplifiers
VIN
V
+
+ U1A
1/2
ISL28x88
-
V
+
U1B+
1/2
ISL28x88
-
VOUT
R1
10k
C1
0.1µF
GAIN=425
R2
158
RF1
680k
VREF
0.082µF
C3
R3
12.4k
R4
2.21k
CF1
4.7µF
BANDPASS AMPLIFIER (0.05Hz TO 159Hz)
FIGURE 1. TYPICAL APPLICATION CIRCUIT
FN6339 Rev 4.00
July 26, 2011
Page 1 of 20
ISL28288, ISL28488
Pin Configurations
ISL28288
(8 LD SOIC)
TOP VIEW
OUT_A 1
IN-_A 2
IN+_A 3
V
-
4
- +
+ -
8 V
+
7 OUT_B
6 IN-_B
5 IN+_B
OUT_A 1
IN-_A 2
IN+_A 3
V
+
4
IN+_B 5
IN-_B 6
OUT_B 7
- +
+ -
- +
+ -
ISL28488
(14 LD TSSOP)
TOP VIEW
14 OUT_D
13 IN-_D
12 IN+_D
11 V
-
10 IN+_C
9 IN-_C
8 OUT_C
ISL28288
(10 LD MSOP)
TOP VIEW
IN+_A
1
EN_A
2
V
-
3
EN_B
4
IN+_B
5
+
-
-
+
10
IN-_A
9
OUT_A
8
V
+
7
OUT_B
6
IN-_B
OUT_A
1
IN-_A
2
ISL28488
(16 LD QSOP)
TOP VIEW
16
OUT_D
15
IN-_D
-
+
-
+
IN+_A
3
V
+
4
IN+_B
5
IN-_B
6
OUT_B
7
NC
8
+
-
+
-
14
IN+_D
13
V
-
12
IN+_C
11
IN-_C
10
OUT_C
9
NC
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
ISL28288FUZ
ISL28288FBZ
ISL28488FAZ (Note 4)
ISL28488FVZ
ISL28288EVAL1Z
ISL28488EVAL1Z
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to
TB347
for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is 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.
3. For Moisture Sensitivity Level (MSL), please see device information page for
ISL28288, ISL28488.
For more information on MSL please see techbrief
TB363
4. Not Recommended for New Designs.
8288Z
28288 FBZ
28488 FAZ
28488 FVZ
Evaluation Board - 10 Ld MSOP
Evaluation Board - 16 Ld QSOP
PART MARKING
10 Ld MSOP
8 Ld SOIC
16 Ld QSOP
14 Ld TSSOP
PACKAGE
(Pb-Free)
PKG. DWG. #
M10.118A
M8.15E
MDP0040
M14.173
FN6339 Rev 4.00
July 26, 2011
Page 2 of 20
ISL28288, ISL28488
Absolute Maximum Ratings
(T
A
= +25
°
C)
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.75V
Differential Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.5V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .V
-
- 0.5V to V
+
+ 0.5V
ESD Tolerance
Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3kV
Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300V
Charged Device Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200V
Thermal Information
Thermal Resistance (Typical)
JA
(°C/W)
JC
(°C/W)
8 Ld SOIC Package (Note5) . . . . . . . . . . . .
125
N/A
10 Ld MSOP Package (Notes 5, 6) . . . . . . .
160
60
14 Ld TSSOP Package (Note 5) . . . . . . . . .
115
N/A
16 Ld QSOP Package (Note 5) . . . . . . . . . .
100
N/A
Output Short-Circuit Duration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Operating Conditions
Ambient Operating Temperature Range . . . . . . . . . . . . . .-40°C to +125°C
Maximum Operating Junction Temperature . . . . . . . . . . . . . . . . . .+125°C
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . 2.4V (±1.2V) to 5.5V (±2.75V)
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
5.
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief
TB379
for details.
6. For
JC
, the “case temp” location is taken at the package top center.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise
noted, all tests are at the specified temperature and are pulsed tests, therefore: T
J
= T
C
= T
A
Electrical Specifications
PARAMETER
DC SPECIFICATIONS
V
OS
V
OS
-----------------
-
Time
V
OS
-------------
-
T
I
OS
I
B
CMIR
CMRR
PSRR
A
VOL
Input Offset Voltage
V
+
= 5V, V
-
= 0V, V
CM
= 2.5V, R
L
= Open, T
A
= +25°C unless otherwise specified. Boldface limits apply
over the operating temperature range, -40°C to +125°C.
DESCRIPTION
CONDITIONS
MIN
(Note 7)
TYP
MAX
(Note 7)
UNIT
-1.5
-2
ISL28288
±
0.05
1.5
2
mV
µV/Mo
µV/°C
Long Term Input Offset Voltage Stability
Input Offset Voltage vs Temperature
Input Offset Current
1.2
0.9
-30
-80
-30
-80
0
80
75
85
80
103
102
100
105
109
95
3
130
6
30
175
225
±
5
-40°C to +85°C
Input Bias Current
-40°C to +85°C
Common-Mode Voltage Range
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
Large Signal Voltage Gain
Guaranteed by CMRR
V
CM
= 0V to 5V
V
+
= 2.4V to 5.5V
V
O
= 0.5V to 4.5V, R
L
= 100k
V
O
= 0.5V to 4.5V, R
L
= 1k
30
80
30
80
5
pA
pA
V
dB
dB
dB
dB
mV
mV
±
10
V
OL
Output Voltage Swing, Low
V
OUT
- V
-
R
L
= 100k
R
L
= 1k
FN6339 Rev 4.00
July 26, 2011
Page 3 of 20
ISL28288, ISL28488
Electrical Specifications
PARAMETER
V
OH
V
+
= 5V, V
-
= 0V, V
CM
= 2.5V, R
L
= Open, T
A
= +25°C unless otherwise specified. Boldface limits apply
over the operating temperature range, -40°C to +125°C.
(Continued)
DESCRIPTION
Output Voltage Swing, High
V
+
- V
OUT
R
L
= 100k
R
L
= 1k
I
S,ON
Quiescent Supply Current, Enabled
ISL28288 Per channel, all channels
enabled.
ISL28488 Per channel.
I
S,OFF
I
O
+
I
O
-
V
SUPPLY
V
ENH
V
ENL
I
ENH
I
ENL
Quiescent Supply Current, Disabled
(ISL28288 MSOP)
Short Circuit Sourcing Capability
Short Circuit Sinking Capability
Supply Operating Range
EN Pin High Level
(ISL28288 10 ld. MSOP)
EN Pin Low Level
(ISL28288 10 ld. MSOP)
EN Pin Input High Current
(ISL28288 10 ld. MSOP)
EN Pin Input Low Current
(ISL28288 10 ld. MSOP)
VEN = V
+
VEN = V
-
0.8
0
All channels disabled.
R
L
= 10
R
L
= 10
V
+
to V
-
2.4
2
0.8
1
1.5
+0.1
24
20
CONDITIONS
MIN
(Note 7)
TYP
4
120
60
60
4
31
-26
-24
-20
5.5
MAX
(Note 7)
10
30
200
250
78
87.5
79
87.5
7
9
UNIT
mV
mV
µA
µA
µA
mA
mA
V
V
V
µA
µA
AC SPECIFICATIONS
GBW
e
n
Gain Bandwidth Product
Input Noise Voltage Peak-to-Peak
Input Noise Voltage Density
i
n
CMRR @ 60Hz
PSRR+ @
120Hz
PSRR- @
120Hz
Input Noise Current Density
Input Common Mode Rejection Ratio
Power Supply Rejection Ratio (V
+
)
Power Supply Rejection Ratio (V
-
)
A
V
= 100, R
F
= 100kR
G
= 1k
R
L
= 10kto V
CM
f = 0.1Hz to 10Hz
f
O
= 1kHz
f
O
= 1kHz
V
CM
= 1V
P-P
, R
L
= 10kto V
CM
V
+
, V
-
= ±1.2V and ±2.5V,
V
SOURCE
= 1V
P-P
, R
L
= 10kto V
CM
V
+
, V
-
= ±1.2V and ±2.5V
V
SOURCE
= 1V
P-P
, R
L
= 10kto V
CM
250
3
48
9
-70
-80
-60
kHz
µV
P-P
nV/Hz
fA/Hz
dB
dB
dB
TRANSIENT RESPONSE
SR
t
EN
Slew Rate
Enable to Output Turn-on Delay Time, 10% VEN
= 5V to 0V, A
V
= -1,
EN to 10% Vout
R
G
= R
F
= R
L
= 1k
to
V
CM
(ISL28288 10 ld. MSOP)
Enable to Output Turn-off Delay Time, 10% VEN
= 0V to 5V, A
V
= -1,
EN to 10% Vout
R
G
= R
F
= R
L
= 1k
to V
CM
(ISL28288 10 ld. MSOP)
NOTE:
7. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
±
0.15
V/µs
µs
2
0.1
µs
FN6339 Rev 4.00
July 26, 2011
Page 4 of 20
ISL28288, ISL28488
Typical Performance Curves
V+
= 5V, V
-
= 0V, V
CM
= 2.5V, R
L
= Open
+1
0
-1
-2
GAIN (dB)
-3
-4
-5 V
OUT
= 50mV
P-P
A
V
= 1
-6 C = 3pF
L
R
F
= 0, R
G
= INF
-7
8
1k
10k
100k
FREQUENCY (Hz)
1M
5M
V
+
, V
-
= ±2.5V
RL = 10k
V
+
, V
-
= ±2.5V
R
L
= 1k
V
+
, V
-
= ±1.2V
R
L
= 1k
GAIN (dB)
V
+
, V
-
= ±1.2V
R
L
= 10k
45
40
35
30
25
20
A
V
= 100
15 R
L
= 10k
C
L
= 3pF
10 R = 100k
F
R
G
= 1k
5
0
100
1k
V
+
, V
-
= ±2.5V
V
+
, V
-
= ±1.2V
V
+
, V
-
= ±1.0V
10k
FREQUENCY (Hz)
100k
1M
FIGURE 2. FREQUENCY RESPONSE vs SUPPLY VOLTAGE
FIGURE 3. FREQUENCY RESPONSE vs SUPPLY VOLTAGE
120
80
GAIN (dB)
40
0
-40
-80
80
40
PHASE (°)
GAIN (dB)
0
-40
-80
-120
10M
100
80
60
40
20
0
-20
10
GAIN
PHASE
200
150
100
50
0
-50
-100
100
1k
10k
100k
-150
1M
PHASE (°)
1
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 4. A
VOL
vs FREQUENCY @ 100k LOAD
FIGURE 5. A
VOL
vs FREQUENCY @ 1k LOAD
100
90
80
70
CMRR (dB)
PSRR (dB)
10
PSRR+
0
-10
-20
-30
-40
-50
-60
-70
PSRR-
-80
-90
1k
10k
FREQUENCY (Hz)
100k
1M
-100
10
100
1k
10k
100k
1M
V
+
, V
-
= ±2.5VDC
V
SOURCE
= 1V
P-P
R
L
= 10k
60
50
40
V
S
= ±2.5V
20 A
V
= 1
10 C
L
= 27.9pF
R = 10k
0 V
L
= 1V
CM
P-P
-10
10
100
30
FREQUENCY (Hz)
FIGURE 6. PSRR vs FREQUENCY
FIGURE 7. CMRR vs FREQUENCY
FN6339 Rev 4.00
July 26, 2011
Page 5 of 20
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