DATASHEET
ISL28148, ISL28248
4.5MHz, Single and Dual Precision Rail-to-Rail Input-Output Op Amps with Very
Low Input Bias Current
The
ISL28148, ISL28248
are 4.5MHz low-power single and
dual operational amplifiers. The parts are optimized for single
supply operation from 2.4V to 5.5V, allowing operation from
one lithium cell or two Ni-Cd batteries.
The single and dual feature an Input Range Enhancement
Circuit (IREC), which enables them to maintain CMRR
performance for input voltages greater than the positive
supply. The input signal is capable of swinging 0.25V above the
positive supply and to 100mV below the negative supply with
only a slight degradation of the CMRR performance. The
output operation is rail-to-rail.
The parts draw minimal supply current (900µA per amplifier)
while meeting excellent DC accuracy, AC performance, noise
and output drive specifications. The ISL28148 features an
enable pin that can be used to turn the device off and reduce
the supply current to a maximum of 16µA. Operation is
guaranteed across the -40°C to +125°C temperature range.
FN6337
Rev 5.00
January 22, 2016
Features
• 4.5MHz gain bandwidth product
• 900µA supply current (per amplifier)
• 1.8mV maximum offset voltage (ISL28248)
• 1pA typical input bias current
• Down to 2.4V single supply operation
• Rail-to-rail input and output
• Enable pin (ISL28148 SOT-23 package only)
• -40°C to +125°C operation
• Pb-free (RoHS compliant)
Applications
• Low-end audio
• 4mA to 20mA current loops
• Medical devices
• Sensor amplifiers
• ADC buffers
• DAC output amplifiers
Ordering Information
PART NUMBER
(Notes
2, 3)
ISL28148FHZ-T7 (Notes
1, 4)
ISL28148FHZ-T7A (Notes
1, 4)
ISL28248FBZ
ISL28248FBZ-T7 (Note
1)
ISL28248FUZ
ISL28248FUZ-T7 (Note
1)
ISL28148EVAL1Z
ISL28248MSOPEVAL1Z
ISL28248SOICEVAL1Z
NOTES:
1. 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 product information page for
ISL28148, ISL28248.
For more information on MSL, please see tech
brief
TB363.
4. The part marking is located on the bottom of the part.
PART MARKING
GABT
GABT
28248 FBZ
28248 FBZ
8248Z
8248Z
Evaluation Board
Evaluation Board
Evaluation Board
1.5k
1k
TAPE AND REEL QUANTITY
(UNITS)
3k
250
PACKAGE
(RoHS Compliant)
6 Ld SOT-23
6 Ld SOT-23
8 Ld SOIC
8 Ld SOIC
8 Ld MSOP
8 Ld MSOP
PKG.
DWG. #
P6.064A
P6.064A
M8.15E
M8.15E
M8.118A
M8.118A
FN6337 Rev 5.00
January 22, 2016
Page 1 of 17
ISL28148, ISL28248
Pin Configurations
ISL28148
(6 LD SOT-23)
TOP VIEW
OUT 1
V- 2
IN+ 3
+ -
6 V+
5 EN
4 IN-
OUT_A 1
IN-_A 2
IN+_A 3
V- 4
- +
+ -
ISL28248
(8 LD SOIC)
TOP VIEW
8 V+
7 OUT_B
6 IN-_B
5 IN+_B
OUT_A 1
IN-_A 2
IN+_A 3
V- 4
ISL28248
(8 LD MSOP)
TOP VIEW
8 V+
- +
+ -
7 OUT_B
6 IN-_B
5 IN+_B
Pin Descriptions
ISL28148
(6 Ld SOT-23)
4
2 (A)
6 (B)
ISL28248
(8 Ld SOIC)
(8 Ld MSOP)
PIN NAME
IN-
IN-_A
IN-_B
FUNCTION
inverting input
V+
IN-
IN+
V-
Circuit 1
EQUIVALENT CIRCUIT
3
3 (A)
5 (B)
2
4
IN+
IN+_A
IN+_B
V-
Noninverting input
(See circuit 1)
Negative supply
V+
CAPACITIVELY
COUPLED
ESD CLAMP
V-
Circuit 2
1
1 (A)
7 (B)
OUT
OUT_A
OUT_B
Output
V+
OUT
V-
Circuit 3
6
5
8
V+
EN
Positive supply
Chip enable
(See circuit 2)
V+
EN
V-
Circuit 4
FN6337 Rev 5.00
January 22, 2016
Page 2 of 17
ISL28148, ISL28248
Absolute Maximum Ratings
(T
A
= +25°C)
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.75V
Supply Turn On Voltage Slew Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1V/µs
Differential Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.5V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V- - 0.5V to V+ + 0.5V
ESD Rating
Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3kV
Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300V
Charged Device Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200V
Thermal Information
Thermal Resistance (Typical,
Note 5)
JA
(°C/W)
6 Ld SOT-23 Package. . . . . . . . . . . . . . . . . . . . . . . . . . . .
165
8 Ld SOIC Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
120
8 Ld MSOP Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
160
Ambient Operating Temperature Range . . . . . . . . . . . . . .-40°C to +125°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .+125°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see
TB493
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.
NOTE:
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.
Electrical Specifications (V
S
±5V)
V
-
= 0V, V
CM
= 2.5V, R
L
= Open, TA = +25°C unless otherwise specified. Boldface limits apply
across the operating temperature range, -40°C to +125°C. Temperature data established by characterization.
PARAMETER
V
OS
DESCRIPTION
Input Offset Voltage
ISL28148
ISL28248
V
OS
---------------
-
T
I
OS
I
B
CMIR
CMRR
PSRR
A
VOL
Input Offset Voltage vs Temperature
Input Offset Current
T
A
= -40°C to +85°C
Input Bias Current
T
A
= -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
= 100kΩto V
CM
V
O
= 0.5V to 4.5V, R
L
= 1kΩto V
CM
V
OUT
Maximum Output Voltage Swing
Output low, R
L
= 100kΩto V
CM
Output low, R
L
= 1kΩto V
CM
Output high, R
L
= 100kΩto V
CM
Output high, R
L
= 1kΩto V
CM
I
S,ON
I
S,OFF
I
O
+
I
O
-
V
SUPPLY
V
ENH
Quiescent Supply Current, Enabled
Quiescent Supply Current, Disabled
Short-Circuit Output Source Current
Short-Circuit Output Sink Current
Supply Operating Range
EN Pin High Level
Per Amplifier
ISL28148 SOT-23 package only
R
L
= 10Ωto V
CM
R
L
= 10Ωto V
CM
V
+
to V
-
ISL28148 SOT-23 package only
2.4
2
48
45
4.994
4.99
4.93
4.89
-35
-80
-30
-80
0
75
70
80
75
200
150
98
98
580
50
3
50
4.998
4.95
0.9
10
75
-68
-48
-45
5.5
1.25
1.4
14
16
6
8
70
110
TEST CONDITIONS
MIN
(Note
6)
-2.3
-2.8
-1.8
-2.8
TYP
0
0
MAX
(Note
6)
2.3
2.8
1.8
2.8
UNIT
mV
mV
µV/°C
0.03
±
5
±
1
35
80
30
80
5
pA
pA
V
dB
dB
V/mV
V/mV
mV
mV
V
V
mA
µA
mA
mA
V
V
FN6337 Rev 5.00
January 22, 2016
Page 3 of 17
ISL28148, ISL28248
V
-
= 0V, V
CM
= 2.5V, R
L
= Open, TA = +25°C unless otherwise specified. Boldface limits apply
across the operating temperature range, -40°C to +125°C. Temperature data established by characterization. (Continued)
PARAMETER
V
ENL
I
ENH
I
ENL
DESCRIPTION
EN Pin Low Level
EN Pin Input High Current
EN Pin Input Low Current
TEST CONDITIONS
ISL28148 SOT-23 package only
V
EN
= V
+
, ISL28148 SOT-23 package only
V
EN
= V
-
, ISL28148 SOT-23 package only
1
12
MIN
(Note
6)
TYP
MAX
(Note
6)
0.8
1.5
1.6
25
30
UNIT
V
µA
nA
Electrical Specifications (V
S
±5V)
AC SPECIFICATIONS
GBW
Unity Gain
Bandwidth
e
N
i
N
CMRR at 60Hz
PSRR- At
120Hz
PSRR+ At
120Hz
SR
t
r
, t
f
, Large
Signal
Gain Bandwidth Product
-3dB Bandwidth
Input Noise Voltage Peak-to-Peak
Input Noise Voltage Density
Input Noise Current Density
Input Common-Mode Rejection Ratio
Power Supply Rejection Ratio (V
-
)
Power Supply Rejection Ratio (V
+
)
A
V
= 100, R
f
= 100kΩR
g
= 1kΩ
R
L
= 10kΩto V
CM
A
V
= 1, R
f
= 0ΩV
OUT
= 10mV
P-P
,
R
L
= 10kΩto V
CM
f = 0.1Hz to 10Hz
f
O
= 1kHz
f
O
= 1kHz
V
CM
= 1V
P-P
, R
L
= 10kΩto V
CM
V
+
, V
-
= ±1.2V and ±2.5V,
V
SOURCE
= 1V
P-P
, R
L
= 10kΩto V
CM
V
+
, V
-
= ±1.2V and ±2.5V
V
SOURCE
= 1V
P-P
, R
L
= 10kΩto V
CM
4.5
13
2
28
0.016
85
-82
-100
MHz
MHz
µV
PP
nV/Hz
pA/Hz
dB
dB
dB
TRANSIENT RESPONSE
Slew Rate
Rise Time, 10% to 90%, V
OUT
Fall Time, 90% to 10%, V
OUT
t
r
, t
f
, Small
Signal
Rise Time, 10% to 90%, V
OUT
Fall Time, 90% to 10%, V
OUT
t
EN
Enable to Output Turn-On Delay Time, 10%
EN to 10% V
OUT
, (ISL28148)
Enable to Output Turn-Off Delay Time, 10%
EN to 10% V
OUT
, (ISL28148)
A
V
= +2, V
OUT
= 3V
P-P
, R
g
= R
f
= 10kΩ
R
L
= 10kΩto V
CM
A
V
= +2, V
OUT
= 3V
P-P
, R
g
= R
f
= 10kΩ
R
L
= 10kΩto V
CM
A
V
= +2, V
OUT
= 10mV
P-P
,
R
g
= R
f
= R
L
= 10kΩto V
CM
A
V
= +2, V
OUT
= 10mV
P-P
,
R
g
= R
f
= R
L
= 10kΩto V
CM
EN
= 5V to 0V, A
V
= +2,
R
g
= R
f
= R
L
= 1kΩto V
CM
±
4
V/µs
ns
ns
ns
ns
µs
µs
530
530
50
50
5
0.2
V
EN
= 0V to 5V, A
V
= +2,
R
g
= R
f
= R
L
= 1kΩ to V
CM
NOTE:
6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
FN6337 Rev 5.00
January 22, 2016
Page 4 of 17
ISL28148, ISL28248
Typical Performance Curves
15
10
R
f
= R
g
= 100k
5
0
V
+
= 5V
-5 R
L
= 1k
C
L
= 16.3pF
-10 A
V
= +2
V
OUT
= 10mV
P-P
-15
100
1k
10k
NORMALIZED GAIN (dB)
V
+
= 5V, V
-
= 0V, V
CM
= 2.5V, R
L
= Open.
1
0
NORMALIZED GAIN (dB)
-1
-2
-3
-4
-5
-6 V = 5V
+
-7 R
L
= 1k
C
L
= 16.3pF
-8
A
V
= +1
-9
1k
10k
V
OUT
= 100mV
V
OUT
= 50mV
V
OUT
= 10mV
V
OUT
= 1V
R
f
= R
g
= 10k
R
f
= R
g
= 1k
100k
1M
10M
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 1. GAIN vs FREQUENCY vs FEEDBACK RESISTOR VALUES
R
f
/R
g
FIGURE 2. GAIN vs FREQUENCY vs V
OUT,
R
L
= 1k
1
0
NORMALIZED GAIN (dB)
NORMALIZED GAIN (dB)
-1
-2
-3
-4
-5
-6
-7
-8
-9
1k
V
+
= 5V
R
L
= 10k
C
L
= 16.3pF
A
V
= +1
10k
100k
1M
10M
100M
V
OUT
= 100mV
V
OUT
= 50mV
V
OUT
= 10mV
V
OUT
= 1V
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
V
+
= 5V
R
L
= 100k
C
L
= 16.3pF
A
V
= +1
1k
10k
100k
1M
10M
100M
V
OUT
= 100mV
V
OUT
= 50mV
V
OUT
= 10mV
V
OUT
= 1V
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 3. GAIN vs FREQUENCY vs V
OUT
, R
L
= 10k
FIGURE 4. GAIN vs FREQUENCY vs V
OUT
, R
L
= 100k
1
0
NORMALIZED GAIN (dB)
-1
-2
-3
-4
-5
-6
-7
-8
-9
V
+
= 5V
V
OUT
= 10mV
P-P
C
L
= 16.3pF
A
V
= +1
1k
10k
100k
R
L
= 1k
R
L
= 10k
GAIN (dB)
R
L
= 100k
70
60
50
40
30
20
10
0
A
V
= 1
A
V
= 1001
A
V
= 101
A
V
= 1, R
g
= INF, R
f
= 0
A
V
= 10, R
g
= 1k, R
f
= 9.09k
A
V
= 101, R
g
= 1k, R
f
= 100k
A
V
= 1001, R
g
= 1k, R
f
= 1M
A
V
= 10
V
+
= 5V
C
L
= 16.3pF
R
L
= 10k
V
OUT
= 10mV
P-P
1M
10M
100M
-10
100
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 5. GAIN vs FREQUENCY vs R
L
FIGURE 6. FREQUENCY RESPONSE vs CLOSED LOOP GAIN
FN6337 Rev 5.00
January 22, 2016
Page 5 of 17
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