ISL28276FBZ [INTERSIL]
Single, Dual and Quad Micropower Single Supply Rail-to-Rail Input and Output (RRIO) Precision Op Amp; 单，双和四通道微功耗单电源轨至轨输入和输出（ RRIO ）精密运算放大器
| 型号： | ISL28276FBZ |
| 厂家： | 
Intersil |
| 描述： | Single, Dual and Quad Micropower Single Supply Rail-to-Rail Input and Output (RRIO) Precision Op Amp |
| 文件： | 总19页 (文件大小：967K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ISL28176, ISL28276, ISL28476
®
Data Sheet
June 23, 2009
FN6301.4
Single, Dual and Quad Micropower Single
Supply Rail-to-Rail Input and Output
(RRIO) Precision Op Amp
Features
• Low power 120µA typical supply current (ISL28276)
• 100µV maximum offset voltage
The ISL28176, ISL28276 and ISL28476 are single, 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.
• 500pA typical input bias current
• 400kHz typical gain-bandwidth product
• 115dB typical PSRR and CMRR
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 down to
the negative supply. The output operation is rail-to-rail.
• Single supply operation down to 2.4V
• Input is capable of swinging above V+ and to V- (ground
sensing)
• Rail-to-rail input and output (RRIO)
• Pb-free (RoHS compliant)
The ISL28276 and ISL28476 draw minimal supply current
while meeting excellent DC-accuracy, AC-performance,
noise and output drive specifications. The ISL28276 (QSOP
package only) contains a power-down enable pin that
reduces the power supply current to typically 4µA in the
disabled state.
Applications
• Battery- or solar-powered systems
• 4mA to 25mA current loops
• Handheld consumer products
• Medical devices
Ordering Information
PART NUMBER
(Note)
PART
MARKING
PACKAGE
(Pb-free)
PKG.
DWG. #
• Thermocouple amplifiers
• Photodiode pre-amps
• pH probe amplifiers
ISL28176FBZ*
ISL28276FBZ*
ISL28276IAZ*
ISL28476FAZ*
28176 FBZ
8 Ld SOIC MDP0027
8 Ld SOIC MDP0027
16 Ld QSOP MDP0040
16 Ld QSOP MDP0040
28276 FBZ
28276 IAZ
28476 FAZ
*Add “-T7” suffix for tape and reel. Please refer to TB347 for details
on reel specifications.
NOTE: 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.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2006, 2007, 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ISL28176, ISL28276, ISL28476
Pinouts
ISL28176
(8 LD SOIC)
TOP VIEW
ISL28276
(16 LD QSOP)
TOP VIEW
NC
1
2
3
4
5
6
7
8
16 NC
NC
IN-_A
IN+_A
V-
1
2
3
4
8
7
6
5
NC
NC
OUT_A
IN-_A
IN+_A
EN_A
V-
15 V+
V+
-
+
14 OUT_B
13 IN-_B
12 IN+_B
11 EN_B
10 NC
OUT_A
NC
NC
9
NC
ISL28276
(8 LD SOIC)
TOP VIEW
ISL28476
(16 LD QSOP)
TOP VIEW
OUT_A
IN-_A
IN+_A
V-
1
2
3
4
8
7
6
5
V+
OUT_A
1
2
3
4
5
6
7
8
16 OUT_D
15 IN-_D
14 IN+_D
13 V-
OUT_B
IN-_B
IN+_B
IN-_A
IN+_A
V+
IN+_B
IN-_B
OUT_B
NC
12 IN+_C
11 IN-_C
10 OUT_C
9
NC
FN6301.4
June 23, 2009
2
ISL28176, ISL28276, ISL28476
Absolute Maximum Ratings (T = +25°C)
Thermal Information
A
Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V
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
Thermal Resistance (Typical, Note 1)
θ
(°C/W)
JA
8 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . .
16 Ld QSOP Package . . . . . . . . . . . . . . . . . . . . . . .
125
100
Output Short-Circuit Duration . . . . . . . . . . . . . . . . . . . . . . .Indefinite
Ambient Operating Temperature Range . . . . . . . . .-40°C to +125°C
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . +150°C
Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3kV
Machine Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .300V
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:
1. θ is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
JA
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 = T = T
A
J
C
Electrical Specifications V+ = 5V, V- = 0V,V
= 2.5V, R = Open, T = +25°C unless otherwise specified.
L A
Boldface limits apply over the operating temperature range, -40°C to +125°C, temperature data
CM
established by characterization.
MIN
MAX
PARAMETER
DESCRIPTION
CONDITIONS
(Note 2) TYP (Note 2) UNIT
DC SPECIFICATIONS
V
Input Offset Voltage
ISL28176
ISL28276
ISL28476
ISL28176
-100
-220
±20
±20
±20
100
220
µV
µV
µV
OS
-100
-150
100
150
-100
-225
100
225
ΔV
Input Offset Voltage vs Temperature
Input Offset Current
0.7
0.5
µV/°C
µV/°C
nA
OS
ΔT
---------------
ISL28276, ISL28476
ISL28176
I
I
-1
-2
±0.4
1.3
2
OS
ISL28276, ISL28476
ISL28176
-1.3
-4
±0.25
±0.5
±0.5
1
4
nA
nA
nA
Input Bias Current
-2
-5
2
5
B
ISL28276, ISL28476
-2
2
-2.5
2.5
CMIR
Common-Mode Voltage Range
Common-Mode Rejection Ratio
Guaranteed by CMRR
0
5
V
CMRR
V
= 0V to 5V
90
80
115
115
dB
CM
PSRR
Power Supply Rejection Ratio
V+ = 2.4V to 5V
90
dB
80
FN6301.4
June 23, 2009
3
ISL28176, ISL28276, ISL28476
Electrical Specifications V+ = 5V, V- = 0V,V
= 2.5V, R = Open, T = +25°C unless otherwise specified.
L A
Boldface limits apply over the operating temperature range, -40°C to +125°C, temperature data
CM
established by characterization. (Continued)
MIN
MAX
PARAMETER
DESCRIPTION
CONDITIONS
(Note 2) TYP (Note 2) UNIT
A
Large Signal Voltage Gain
ISL28176
= 0.5V to 4.5V, R = 100kΩ
200
200
500
550
V/mV
V/mV
VOL
V
O
L
ISL28276, ISL28476
= 0.5V to 4.5V, R = 100kΩ
350
350
V
O
L
ISL28176,
= 0.5V to 4.5V, R = 1kΩ
V
25
V/mV
O
L
ISL28276, ISL28476
= 0.5V to 4.5V, R = 1kΩ
V
95
3
V/mV
mV
O
L
V
Maximum Output Voltage Swing
ISL28176
Output low, R = 100kΩ
8
OUT
L
10
Output low, R = 1kΩ
130
200
300
mV
V
L
Output high, R = 100kΩ
4.994 4.997
L
4.992
Output high, R = 1kΩ
4.750 4.867
V
L
4.7
Maximum Output Voltage Swing
ISL28276, ISL28476
Output low, R = 100kΩ
3
6
30
mV
mV
V
L
Output low, R = 1kΩ
130
175
225
L
Output high, R = 100kΩ
4.990 4.996
L
4.97
Output high, R = 1kΩ
4.800 4.880
V
L
4.750
I
Supply Current, Enabled
ISL28176
35
30
55
120
240
4
75
90
µA
µA
µA
µA
mA
mA
mA
mA
S,ON
ISL28276, All channels enabled.
ISL28476, All channels enabled.
156
175
315
350
I
I
Supply Current, Disabled
ISL28276IAZ (QSOP package only),
All channels disabled.
7
9
S,OFF
+
Short Circuit Sourcing Capability
ISL28176
18
18
31
31
26
26
SC
R
= 10Ω
L
ISL28276, ISL28476
= 10Ω
29
23
R
L
I
-
Short Circuit Sinking Capability
ISL28176
= 10Ω
17
15
SC
R
L
ISL28276, ISL28476
= 10Ω
24
19
R
L
V
V
V
Supply Operating Range
EN Pin High Level
V to V
+
2.4
2
5
V
V
SUPPLY
ENH
-
ISL28276IAZ, (QSOP package only)
ISL28276IAZ, (QSOP package only)
EN Pin Low Level
0.8
V
ENL
I
EN Pin Input High Current
V
= V
+
0.7
1.3
1.5
µA
ENH
EN
ISL28276IAZ, (QSOP package only)
FN6301.4
June 23, 2009
4
ISL28176, ISL28276, ISL28476
Electrical Specifications V+ = 5V, V- = 0V,V
= 2.5V, R = Open, T = +25°C unless otherwise specified.
L A
Boldface limits apply over the operating temperature range, -40°C to +125°C, temperature data
CM
established by characterization. (Continued)
MIN
MAX
PARAMETER
DESCRIPTION
CONDITIONS
(Note 2) TYP (Note 2) UNIT
I
EN Pin Input Low Current
V
= V-
0
0.1
µA
ENL
EN
ISL28276IAZ, (QSOP package only)
AC SPECIFICATONS
GBW Gain Bandwidth Product
A
R
= 100, R = 100kΩ, R = 1kΩ,
400
1.5
2.5
28
kHz
V
F
G
= 10kΩ to V
L
CM
e
Input Noise Voltage Peak-to-Peak
ISL28176
f = 0.1Hz to 10Hz
µV
n
P-P
P-P
ISL28276, ISL28476
f = 0.1Hz to 10Hz
µV
Input Noise Voltage Density
ISL28176
nV/√Hz
nV/√Hz
pA/√Hz
pA/√Hz
dB
f
= 1kHz
O
ISL28276, ISL28476
= 1kHz
30
f
O
i
Input Noise Current Density
ISL28176
= 1kHz
0.16
0.12
78
n
f
O
ISL28276, ISL28476
= 1kHz
f
O
CMRR @ 60Hz
Input Common Mode Rejection Ratio
ISL28276, ISL28476
= 1V , R = 10kΩ to V
CM
V
CM
ISL28176
V , V- = ±1.2V and ±2.5V,
P-P
L
PSRR+ @ 120Hz Power Supply Rejection Ratio, +V
PSRR- @ 120Hz Power Supply Rejection Ratio, -V
TRANSIENT RESPONSE
90
dB
+
V
= 1V , R = 10kΩ to V
P-P
SOURCE
L
CM
CM
CM
CM
ISL28276, ISL28476
V , V- = ±1.2V and ±2.5V,
105
70
dB
dB
dB
+
V
= 1V , R = 10kΩ to V
SOURCE
ISL28176
V , V- = ±1.2V and ±2.5V
P-P
L
+
V
= 1V , R = 10kΩ to V
P-P
SOURCE
L
ISL28276, ISL28476
V , V- = ±1.2V and ±2.5V
V
73
+
= 1V , R = 10kΩ to V
P-P
SOURCE
L
SR
Slew Rate
ISL28176
ISL28276, ISL28476
±0.065 ±0.13
±0.3
V/µs
V/µs
±0.10
±0.17
±0.20
±0.09
±0.25
t
Enable to Output Turn-on Delay Time,
V
R
= 5V to 0V, A = -1,
EN V
2
µs
µs
EN
10% EN to 10% V
,
= R = RL = 1k to V
ISL28276IAZ,
= R = RL = 1k to V ISL28276IAZ,
CM,
OUT
g
f
CM,
(QSOP package only)
Enable to Output Turn-off Delay Time,
V
R
= 0V to 5V, A = -1,
V
0.1
EN
10% EN to 10% V
OUT
g
f
(QSOP package only)
NOTE:
2. 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.
FN6301.4
June 23, 2009
5
ISL28176, ISL28276, ISL28476
Typical Performance Curves
2
+1
V
= 2.5V
+
1
0
-1
-2
-3
-4
-5
-6
-7
-8
V , V = ±1.2V
+
-
L
0
R
= 1k
V , V = ±2.5V
+
-
L
-1
-2
R
= 1k
V , V = ±1.2V
+
R
-
L
= 10k
V
= 5V
= 2V
+
-3
-4
-5
-6
-7
-8
-9
V , V = ±2.5V
+
R
-
L
= 10k
R
C
= 10k
= 8.3pF
= +1
L
L
V
= 50mV
P-P
V
OUT
= 1
+
A
V
A
V
C
R
= 3pF
L
F
V
= 10mV
= 0/R = INF
OUT
P-P
G
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1k
10k
100k
FREQUENCY (Hz)
1M
5M
FIGURE 1. ISL28176 GAIN vs FREQUENCY vs SUPPLY
VOLTAGE
FIGURE 2. ISL28276, ISL28476 FREQUENCY RESPONSE vs
SUPPLY VOLTAGE
45
40
35
30
45
40
V
= 2.5V
35
30
25
20
15
10
5
+
25
V , V = ±1.25V
V
= 5V
+
-
+
20
15
10
5
A
R
C
= 100
= 10kΩ
= 2.7pF
V
L
L
F
F
G
A
R
C
= 100
= 10k
= 8.3pF
= 10mV
= 221kΩ
= 2.23kΩ
V
L
L
V , V = ±2.5V
+
-
V
= 2V
+
R /R = 99.02
R
R
G
V
R
R
OUT
P-P
V , V = ±1.0V
= 221kΩ
+
-
F
G
= 2.23kΩ
0
100
0
1k
10k
100k
1M
100
1k
10k
FREQUENCY (Hz)
100k
1M
FREQUENCY (Hz)
FIGURE 3. ISL28176 GAIN vs FREQUENCY vs SUPPLY
VOLTAGE
FIGURE 4. ISL28276, ISL28476 FREQUENCY RESPONSE vs
SUPPLY VOLTAGE
120
80
200
150
100
50
100
80
60
40
20
0
80
40
0
40
PHASE
0
GAIN
0
-40
-80
-120
GAIN
10k
-50
-100
-150
PHASE
100
-40
-80
-20
10
100
1k
100k
1M
1
10
1k
10k 100k
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 5. A
VOL
vs FREQUENCY @ 100kΩ LOAD
FIGURE 6. A
VOL
vs FREQUENCY @ 1kΩ LOAD
FN6301.4
June 23, 2009
6
ISL28176, ISL28276, ISL28476
Typical Performance Curves (Continued)
120
110
100
90
100
90
80
70
60
50
40
30
20
10
V , V = ±2.5V
+
-
V
= 1V
SOURCE
P-P
R
= 100k
= +1
Ω
PSRR +
L
A
V
80
70
60
50
PSRR -
V , V = ±2.5V
40
30
+
-
V
= 1V
SOURCE
P-P
20
10
R
= 100k
Ω
L
A
= +1
V
0
10
100
1k
10k
100k
1M
10
100
1k
FREQUENCY (Hz)
10k
100k
FREQUENCY (Hz)
FIGURE 7. PSRR vs FREQUENCY
FIGURE 8. CMRR vs FREQUENCY
1000
100
10
1k
100
10
V
R
= 5V
+
L
L
= OPEN
= 8.3pF
= +1
C
A
V
100k
0.1
1
10
100
1k
10k
100k
1
10
100
1k
10k
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 9. ISL28176 INPUT VOLTAGE NOISE DENSITY vs
FREQUENCY
FIGURE 10. ISL28276, ISL28476 VOLTAGE NOISE vs
FREQUENCY
10
10.0
V
= 5V
+
R
= OPEN
L
L
C
= 8.3pF
= +1
A
V
1
1.0
0.1
0.1
0.1
1
10
100
1k
10k
100k
1
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 11. ISL28176 INPUT CURRENT NOISE DENSITY vs
FREQUENCY
FIGURE 12. ISL28276, ISL28476 CURRENT NOISE vs
FREQUENCY
FN6301.4
June 23, 2009
7
ISL28176, ISL28276, ISL28476
Typical Performance Curves (Continued)
1.5
1.0
0.5
0
2.0
1.5
1.0
0.5
0
V
= 5V
+
R
C
R
= OPEN
L
L
g
= 8.3pF
= 10, R = 10k
= 1000
f
A
V
-0.5
-1.0
-1.5
-2.0
-0.5
-1.0
-1.5
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
TIME (s)
TIME (1s/DIV)
FIGURE 13. ISL28176 INPUT VOLTAGE NOISE 0.1Hz TO 10Hz
FIGURE 14. ISL28276, ISL28476 0.1Hz TO 10Hz INPUT
VOLTAGE NOISE
2.56
12
10
8
V
IN
2.54
2.52
2.50
2.48
2.46
2.44
2.42
V
OUT
6
V , V = ±2.5V
+
-
R
= 10k
L
L
g
4
2
C
R
A
= 8.3pF
= R = 10k
f
V
V
= 5VDC
+
= 2
= 10mV
= 0.1V
P-P
V
OUT
OUT
= 500Ω
V
P-P
R
L
0
A
= +1
V
-2
0
2
4
6
8
10 12 14 16 18 20
TIME (µs)
0
50
100
150
200
250
300
350
400
TIME (µs)
FIGURE 15. ISL28176 SMALL SIGNAL TRANSIENT RESPONSE
FIGURE 16. ISL28276, ISL28476 SMALL SIGNAL TRANSIENT
RESPONSE
2.5
2.0
1.5
1.0
4.0
V
IN
V
OUT
3.5
3.0
2.5
V
V
= 5VDC
+
= 2V
P-P
OUT
= 1kΩ
L
= -1
R
A
0.5
0
V , V = ±2.5V
+
-
R
= 10k
L
L
g
V
C
R
= 8.3pF
= 10k
-0.5
-1.0
-1.5
-2.0
-2.5
R = 30k
f
2.0
1.5
1.0
A
OUT
= 4
V
V
OUT
V
= 4V
P-P
V
IN
0
20
40
60
80
100
0
50
100
150
200
250
300
350
400
TIME (µs)
TIME (µs)
FIGURE 17. ISL28176 LARGE SIGNAL TRANSIENT
RESPONSE
FIGURE 18. ISL28276, ISL28476 LARGE SIGNAL TRANSIENT
RESPONSE
FN6301.4
June 23, 2009
8
ISL28176, ISL28276, ISL28476
Typical Performance Curves (Continued)
100
80
A
= -1
= 200mV
= 5V
V
EN
INPUT
V
V
IN
P-P
60
+
V = 0V
-
40
20
0
0
0
-20
-40
-60
-80
-100
V+ = 5V
V
OUT
R
= OPEN
L
F
R
= 100k, R = 100
G
A
= +1000
V
-1
0
1
2
V
3
(V)
4
5
6
10µs/DIV
CM
FIGURE 19. ISL28276 ENABLE TO OUTPUT DELAY TIME
FIGURE 20. INPUT OFFSET VOLTAGE vs COMMON-MODE
INPUT VOLTAGE
155
135
115
95
100
80
60
40
20
0
-20
75
-40
-60
V+ = 5V
R
= OPEN
L
F
55
R
= 100k, R = 100
G
-80
A
= +1000
V
35
-100
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-1
0
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
V
(V)
CM
FIGURE 21. INPUT OFFSET CURRENT vs COMMON-MODE
INPUT VOLTAGE
FIGURE 22. ISL28276 SUPPLY CURRENT vs SUPPLY VOLTAGE
75
150
n = 12
70
N = 7
100
MAX
65
50
MAX
60
0
MIN
MEDIAN
55
-50
MIN
MEDIAN
50
-100
45
-40
-150
-40
-20
0
20
40
60
80
100
120
-20
0
20
40
60
80
100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 23. ISL28176 SUPPLY CURRENT vs TEMPERATURE
FIGURE 24. ISL28276 SUPPLY CURRENT vs TEMPERATURE,
V ,V = ±2.5V ENABLED, R = INF
V
= ±2.5V ENABLED, R = INF
S
L
+
-
L
FN6301.4
June 23, 2009
9
ISL28176, ISL28276, ISL28476
Typical Performance Curves (Continued)
4.9
4.7
4.5
4.3
4.1
3.9
3.7
3.5
320
300
280
260
240
220
200
N = 7
N = 1000
MAX
MEDIAN
MAX
MEDIAN
MIN
MIN
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 25. ISL28476 SUPPLY CURRENT vs TEMPERATURE,
FIGURE 26. ISL28276 SUPPLY CURRENT vs TEMPERATURE,
V , V = ±2.5V ENABLED, R = INF
V , V = ±2.5V DISABLED, R = INF
+
-
L
+
-
L
200
150
100
50
200
150
100
50
SO PACKAGE
SO PACKAGE
n = 12
n = 12
MAX
MAX
MEDIAN
MEDIAN
MIN
0
0
MIN
-50
-40
-50
-40
-20
0
20
40
60
80
100 120
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 27. ISL28176 INPUT OFFSET VOLTAGE vs
FIGURE 28. ISL28176 INPUT OFFSET VOLTAGE vs
TEMPERATURE V = ±2.5V
S
TEMPERATURE V = ±1.2V
S
150
100
50
150
100
50
N = 7
N = 7
MAX
MAX
MEDIAN
MIN
MEDIAN
MIN
0
0
-50
-100
-150
-50
-100
-150
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
TEMPERATURE (°C)
vs TEMPERATURE, V = 0V,
40
60
80
100
120
TEMPERATURE (°C)
FIGURE 29. ISL28276 V
vs TEMPERATURE, V = 0V,
IN
FIGURE 30. ISL28276 V
OS
OS
V ,V = ±2.5V
IN
V ,V = ±1.2V
+
-
+ -
FN6301.4
June 23, 2009
10
ISL28176, ISL28276, ISL28476
Typical Performance Curves (Continued)
200
150
100
50
200
150
100
50
N = 1000
N = 1000
MAX
MAX
MEDIAN
MEDIAN
0
0
-50
-50
MIN
MIN
-100
-150
-200
-100
-150
-200
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 31. ISL28476 V
vs TEMPERATURE, V = 0V,
IN
FIGURE 32. ISL28476 V
vs TEMPERATURE, V = 0V,
OS IN
OS
V ,V = ±2.5V
V ,V = ±1.2V
+
-
+
-
2.5
2.0
1.5
1.0
0.5
0
3.0
2.5
2.0
1.5
1.0
0.5
0
n = 12
n = 12
MAX
MAX
MEDIAN
MEDIAN
MIN
MIN
0
-0.5
-40
-0.5
-20
20
40
60
80
100 120
-40
-20
0
20
40
60
80
100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 33. ISL28176 I
(+) vs TEMPERATURE V = ±2.5V
FIGURE 34. ISL28176 I (+) vs TEMPERATURE V = ±1.2V
BIAS S
BIAS
S
2.5
3.0
N = 1000
N = 1000
2.5
2.0
1.5
1.0
0.5
0
MAX
2.0
1.5
1.0
0.5
0
MAX
MEDIAN
MIN
MEDIAN
MIN
-0.5
-1.0
-1.5
-0.5
-1.0
-1.5
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 35. ISL28276 ISL28476 I
(+) vs TEMPERATURE,
FIGURE 36. ISL28276, ISL28476 I
(+) vs TEMPERATURE,
BIAS
BIAS
V ,V = ±2.5V
V ,V = ±1.2V
+ -
+
-
FN6301.4
June 23, 2009
11
ISL28176, ISL28276, ISL28476
Typical Performance Curves (Continued)
2.5
2.0
1.5
1.0
0.5
0
3.0
2.5
2.0
1.5
1.0
0.5
0
n = 12
n = 12
MAX
MAX
MEDIAN
MEDIAN
MIN
MIN
-0.5
-0.5
-40
-20
0
20
40
60
80
100 120
-40
-20
0
20
40
60
80
100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 37. ISL28176 I
(-) vs TEMPERATURE V = ±2.5V
S
FIGURE 38. ISL28176 I
(-) vs TEMPERATURE V = ±1.2V
BIAS S
BIAS
2.5
2.5
N = 1000
N = 1000
MAX
2.0
1.5
1.0
0.5
0
2.0
1.5
1.0
0.5
0
MAX
MEDIAN
MIN
MEDIAN
MIN
-0.5
-1.0
-1.5
-2.0
-0.5
-1.0
-1.5
-2.0
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 39. ISL28276 ISL28476 I
(-) vs TEMPERATURE,
FIGURE 40. ISL28276, ISL28476 I
(-) vs TEMPERATURE,
BIAS
BIAS
V , V = ±2.5V
V , V = ±1.2V
+
-
+ -
2.5
2.0
1.5
1.0
0.5
0
2.5
2.0
1.5
1.0
0.5
0
N = 1000
n = 12
MAX
MAX
MEDIAN
-0.5
-1.0
-1.5
-2.0
MEDIAN
MIN
MIN
0
-0.5
-40
-20
20
40
60
80
100 120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 41. ISL28176 INPUT OFFSET CURRENT vs
FIGURE 42. ISL28276, ISL28476 I
vs TEMPERATURE,
OS
TEMPERATURE, V = ±2.5V
S
V , V = ±2.5V
+ -
FN6301.4
June 23, 2009
12
ISL28176, ISL28276, ISL28476
Typical Performance Curves (Continued)
900
800
700
600
500
400
300
200
100
0
1050
950
850
750
650
550
450
350
n = 12
N = 1000
MAX
MAX
MEDIAN
MEDIAN
MIN
MIN
-40
-20
0
20
40
60
80
100 120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 43. ISL28176 A
, R = 100k, V ±2.5V, V = ±2V
FIGURE 44. ISL28276, ISL28476 A vs TEMPERATURE,
VOL
VOL
L
S
O
V , V = ±2.5V, R = 100k
+
-
L
125
135
130
125
120
115
110
105
100
95
N = 1000
n = 12
MAX
120
MAX
115
MEDIAN
MIN
110
105
100
95
MEDIAN
MIN
90
-40
-40
-20
0
20
40
60
80
100 120
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 45. ISL28176 CMRR vs TEMPERATURE, VCM = +2.5V
TO -2.5V
FIGURE 46. ISL28276, ISL28476 CMRR vs TEMPERATURE,
V
= +2.5V TO -2.5V V , V = ±2.5V
CM
+
-
140
140
130
120
110
100
90
n = 12
N = 1000
MAX
135
130
MAX
125
120
115
110
105
100
95
MEDIAN
MIN
MEDIAN
MIN
80
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 47. ISL28176 PSRR vs TEMPERATURE, V = ±1.2V
S
FIGURE 48. ISL28276, ISL28476 PSRR vs TEMPERATURE, V ,
+
TO ±2.5V
V = ±1.2V to ±2.5V
-
FN6301.4
June 23, 2009
13
ISL28176, ISL28276, ISL28476
Typical Performance Curves (Continued)
4.91
4.90
4.89
4.88
4.87
4.86
4.85
4.84
4.83
4.82
4.91
4.90
4.89
4.88
4.87
4.86
4.85
n = 12
N = 1000
MAX
MAX
MEDIAN
MEDIAN
MIN
MIN
-40
-20
0
20
40
60
80
100 120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 49. ISL28176 V
HIGH vs TEMPERATURE,
FIGURE 50. ISL28276, ISL28476 V
HIGH vs
OUT
OUT
V , V = ±2.5V, R = 1k
TEMPERATURE, V ,V = ±2.5V, R = 1k
+
-
L
+
-
L
170
160
150
140
130
120
110
100
90
240
220
200
180
160
140
120
100
80
n = 12
N = 1000
MEDIAN
MAX
MAX
MEDIAN
MIN
MIN
80
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 51. ISL28176 V
LOW vs TEMPERATURE,
FIGURE 52. ISL28276, ISL28476 V
LOW vs
OUT
OUT
V , V = ±2.5V, R = 1k
TEMPERATURE, V , V = ±2.5V, R = 1k
+
-
L
+
-
L
39
37
35
33
31
29
27
25
-21
-23
-25
-27
-29
-31
-33
N = 1000
N = 1000
MAX
MAX
MEDIAN
MEDIAN
MIN
MIN
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 53. ISL28276, ISL28476 + OUTPUT SHORT CIRCUIT
CURRENT vs TEMPERATURE, V = -2.55V,
FIGURE 54. ISL28276, ISL28476 - OUTPUT SHORT CIRCUIT
CURRENT vs TEMPERATURE, V = +2.55V,
IN
IN
R
= 10, V , V = ±2.5V
R = 10, V , V = ±2.5V
L + -
L
+
-
FN6301.4
June 23, 2009
14
ISL28176, ISL28276, ISL28476
Typical Performance Curves (Continued)
0.23
0.21
0.19
0.17
0.15
0.13
0.11
0.09
0.24
0.22
0.20
0.18
0.16
0.14
0.12
0.10
N = 1000
n = 12
MAX
MAX
MEDIAN
MEDIAN
MIN
MIN
-40
-20
0
20
40
60
80
100 120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 55. ISL28176 + SLEW RATE vs TEMPERATURE,
FIGURE 56. ISL28276, ISL28476 + SLEW RATE vs
V
= ±1.5V, A = +2
TEMPERATURE, V
= ±1.5V, A = +2
OUT
V
OUT
V
0.17
0.16
0.15
0.14
0.13
0.12
0.11
0.10
0.24
0.22
0.20
0.18
0.16
0.14
0.12
0.10
N = 1000
n = 12
MAX
MAX
MEDIAN
MEDIAN
MIN
MIN
-40
-20
0
20
40
60
80
100 120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 57. ISL28176 - SLEW RATE vs TEMPERATURE, V
FIGURE 58. ISL28276, ISL28476 - SLEW RATE vs
TEMPERATURE, V = ±1.5V, A = +2
OUT
= ±1.5V, A = +2
V
OUT
V
Pin Descriptions
ISL28176
ISL28276
ISL28276
ISL28476
PIN
EQUIVALENT
CIRCUIT
(8 LD SOIC) (8 LD SOIC) (16 LD QSOP) (16 LD QSOP) NAME
DESCRIPTION
6
2
3
7
1
2
3
8
5
6
7
3
1
2
OUT_A
IN-_A
IN+_A
V+
Circuit 3
Circuit 1
Circuit 1
Circuit 4
Circuit 1
Circuit 1
Circuit 3
Amplifier A output
4
Amplifier A inverting input
Amplifier A non-inverting input
Positive power supply
5
3
15
4
12
5
IN+_B
IN-_B
OUT_B
NC
Amplifier B non-inverting input
Amplifier B inverting input
Amplifier B output
13
14
6
7
1, 5, 8
1, 2, 8, 9, 10, 16
8, 9
10
11
12
No internal connection
OUT_C
IN-_C
IN+_C
Circuit 3
Circuit 1
Circuit 1
Amplifier C output
Amplifier C inverting input
Amplifier B non-inverting input
FN6301.4
June 23, 2009
15
ISL28176, ISL28276, ISL28476
Pin Descriptions (Continued)
ISL28176
ISL28276
ISL28276
ISL28476
PIN
EQUIVALENT
CIRCUIT
(8 LD SOIC) (8 LD SOIC) (16 LD QSOP) (16 LD QSOP) NAME
DESCRIPTION
Negative power supply
4
4
7
13
14
15
16
V-
Circuit 4
Circuit 1
Circuit 1
Circuit 3
Circuit 2
IN+_D
IN-_D
OUT_D
EN_A
Amplifier D non-inverting input
Amplifier D inverting input
Amplifier D output
6
Amplifier A enable pin internal pull-down; Logic “1”
selects the disabled state; Logic “0” selects the enabled
state.
11
EN_B
Circuit 2
Amplifier B enable pin with internal pull-down; Logic “1”
selects the disabled state; Logic “0” selects the enabled
state.
V+
V+
V+
V+
CAPACITIVELY
COUPLED
ESD CLAMP
LOGIC
PIN
OUT
IN-
IN+
V-
V-
V-
V-
CIRCUIT 1
CIRCUIT 2
CIRCUIT 3
CIRCUIT 4
Input Protection
Applications Information
All input terminals have internal ESD protection diodes to the
positive and negative supply rails, limiting the input voltage
to within one diode beyond the supply rails. Both parts have
additional back-to-back diodes across the input terminals. If
overdriving the inputs is necessary, the external input current
must never exceed 5mA. External series resistors may be
used as an external protection to limit excessive external
voltage and current from damaging the inputs.
Introduction
The ISL28176, ISL28276 and ISL28476 are single, dual and
quad BiCMOS rail-to-rail input, output (RRIO) micropower
precision operational amplifiers. These devices are designed
to operate from a single supply (2.4V to 5.0V) or dual
supplies (±1.2V to ±2.5V) while drawing only 120µA
(ISL28276) of supply current. This combination of low power
and precision performance makes these devices suitable for
solar and battery power applications.
Input Bias Current Compensation
The devices contain an input bias cancellation circuit which
reduces the bias currents down to a typical of 500pA while
maintaining an excellent bandwidth for a micro-power
operational amplifier. The input stage transistors are still
biased with adequate current for speed but the canceling
circuit sinks most of the base current, leaving a small fraction
as input bias current.
Rail-to-Rail Input
Many rail-to-rail input stages use two differential input pairs, a
long-tail PNP (or PFET) and an NPN (or NFET). Severe
penalties have to be paid for this circuit topology. As the input
signal moves from one supply rail to another, the operational
amplifier switches from one input pair to the other causing
drastic changes in input offset voltage and an undesired
change in magnitude and polarity of input offset current.
Rail-to-Rail Output
A pair of complementary MOSFET devices are used to
achieve the rail-to-rail output swing. The NMOS sinks
current to swing the output in the negative direction. The
PMOS sources current to swing the output in the positive
direction. Both parts, with a 100kΩ load, will typically swing to
within 4mV of the positive supply rail and within 3mV of the
negative supply rail.
The devices achieve rail-to-rail input without sacrificing
important precision specifications and degrading distortion
performance. The devices’ input offset voltage exhibits a
smooth behavior throughout the entire common-mode input
range. The input bias current versus the common-mode
voltage range gives us an undistorted behavior from typically
down to the negative rail to 10% higher than the V rail (0.5V
+
higher than V when V equals 5V).
+
+
FN6301.4
June 23, 2009
16
ISL28176, ISL28276, ISL28476
Enable/Disable Feature
V
+
HIGH IMPEDANCE INPUT
The ISL28276 (QSOP package only) offers two EN pins
(EN_A and EN_B) which disable the op amp when pulled up
to at least 2.0V. In the disabled state (output in a high
impedance state), the part consumes typically 4µA. By
disabling the part, multiple parts can be connected together
as a MUX. The outputs are tied together in parallel and a
channel can be selected by the EN pins. The loading effects
of the feedback resistors of the disabled amplifier must be
considered when multiple amplifier outputs are connected
together. The EN pin also has an internal pull-down. If left
open, the EN pin will pull to the negative rail and the device
will be enabled by default.
IN
FIGURE 60. GUARD RING EXAMPLE FOR UNITY GAIN
AMPLIFIER
Current Limiting
The ISL28176, ISL28276 and ISL28476 have no internal
current-limiting circuitry. If the output is shorted, it is possible
to exceed the Absolute Maximum Rating for output current
or power dissipation, potentially resulting in the destruction
of the device.
Using Only One Channel
The ISL28276 and ISL28476 are dual and quad channel
op amps. If the application only requires one channel when
using the ISL28276 or less than 4 channels when using the
ISL28476, the user must configure the unused channel(s) to
prevent them from oscillating. The unused channel(s) will
oscillate if the input and output pins are floating. This will
result in higher than expected supply currents and possible
noise injection into the channel being used. The proper way
to prevent this oscillation is to short the output to the
negative input and ground the positive input (as shown in
Figure 59).
Power Dissipation
It is possible to exceed the +150°C maximum junction
temperatures under certain load and power-supply
conditions. It is therefore important to calculate the
maximum junction temperature (T
) for all applications
JMAX
to determine if power supply voltages, load conditions, or
package type need to be modified to remain in the safe
operating area. These parameters are related as follows:
T
= T
+ (θ xPD
)
MAXTOTAL
(EQ. 1)
JMAX
MAX
JA
-
where:
• P
+
1/2 ISL28276
1/4 ISL28476
is the sum of the maximum power
MAX
DMAXTOTAL
dissipation of each amplifier in the package (PD
)
FIGURE 59. PREVENTING OSCILLATIONS IN UNUSED
CHANNELS
• PD
for each amplifier can be calculated as follows:
MAX
V
OUTMAX
R
L
Proper Layout Maximizes Performance
----------------------------
PD
= 2*V × I
+ (V - V ) ×
OUTMAX
MAX
S
SMAX
S
(EQ. 2)
To achieve the maximum performance of the high input
impedance and low offset voltage, care should be taken in
the circuit board layout. The PC board surface must remain
clean and free of moisture to avoid leakage currents
between adjacent traces. Surface coating of the circuit board
will reduce surface moisture and provide a humidity barrier,
reducing parasitic resistance on the board. When input
leakage current is a concern, the use of guard rings around
the amplifier inputs will further reduce leakage currents.
Figure 60 shows a guard ring example for a unity gain
amplifier that uses the low impedance amplifier output at the
same voltage as the high impedance input to eliminate
surface leakage. The guard ring does not need to be a
specific width, but it should form a continuous loop around
both inputs. For further reduction of leakage currents,
components can be mounted to the PC board using Teflon
standoff insulators.
where:
• T
= Maximum ambient temperature
MAX
• θ = Thermal resistance of the package
JA
• PD
MAX
= Maximum power dissipation of 1 amplifier
• V = Supply voltage (Magnitude of V and V )
S
+
-
• I
= Maximum supply current of 1 amplifier
MAX
• V
OUTMAX
application
= Maximum output voltage swing of the
• R = Load resistance
L
FN6301.4
June 23, 2009
17
ISL28176, ISL28276, ISL28476
Small Outline Package Family (SO)
A
D
h X 45°
(N/2)+1
N
A
PIN #1
I.D. MARK
E1
E
c
SEE DETAIL “X”
1
(N/2)
B
L1
0.010 M
C A B
e
H
C
A2
A1
GAUGE
PLANE
SEATING
PLANE
0.010
L
4° ±4°
0.004 C
b
0.010 M
C
A
B
DETAIL X
MDP0027
SMALL OUTLINE PACKAGE FAMILY (SO)
INCHES
SO16
(0.150”)
SO16 (0.300”)
(SOL-16)
SO20
SO24
(SOL-24)
SO28
(SOL-28)
SYMBOL
SO-8
0.068
0.006
0.057
0.017
0.009
0.193
0.236
0.154
0.050
0.025
0.041
0.013
8
SO-14
0.068
0.006
0.057
0.017
0.009
0.341
0.236
0.154
0.050
0.025
0.041
0.013
14
(SOL-20)
0.104
0.007
0.092
0.017
0.011
0.504
0.406
0.295
0.050
0.030
0.056
0.020
20
TOLERANCE
MAX
NOTES
A
A1
A2
b
0.068
0.006
0.057
0.017
0.009
0.390
0.236
0.154
0.050
0.025
0.041
0.013
16
0.104
0.007
0.092
0.017
0.011
0.406
0.406
0.295
0.050
0.030
0.056
0.020
16
0.104
0.007
0.092
0.017
0.011
0.606
0.406
0.295
0.050
0.030
0.056
0.020
24
0.104
0.007
0.092
0.017
0.011
0.704
0.406
0.295
0.050
0.030
0.056
0.020
28
-
±0.003
±0.002
±0.003
±0.001
±0.004
±0.008
±0.004
Basic
-
-
-
c
-
D
1, 3
E
-
E1
e
2, 3
-
L
±0.009
Basic
-
L1
h
-
Reference
Reference
-
N
-
Rev. M 2/07
NOTES:
1. Plastic or metal protrusions of 0.006” maximum per side are not included.
2. Plastic interlead protrusions of 0.010” maximum per side are not included.
3. Dimensions “D” and “E1” are measured at Datum Plane “H”.
4. Dimensioning and tolerancing per ASME Y14.5M-1994
FN6301.4
June 23, 2009
18
ISL28176, ISL28276, ISL28476
Quarter Size Outline Plastic Packages Family (QSOP)
A
MDP0040
QUARTER SIZE OUTLINE PLASTIC PACKAGES FAMILY
D
(N/2)+1
N
INCHES
SYMBOL QSOP16 QSOP24 QSOP28 TOLERANCE NOTES
A
A1
A2
b
0.068
0.006
0.056
0.010
0.008
0.193
0.236
0.154
0.025
0.025
0.041
16
0.068
0.006
0.056
0.010
0.008
0.341
0.236
0.154
0.025
0.025
0.041
24
0.068
0.006
0.056
0.010
0.008
0.390
0.236
0.154
0.025
0.025
0.041
28
Max.
±0.002
±0.004
±0.002
±0.001
±0.004
±0.008
±0.004
Basic
-
PIN #1
I.D. MARK
E
E1
-
-
-
1
(N/2)
c
-
B
D
1, 3
0.010 C A B
E
-
e
E1
e
2, 3
H
-
C
SEATING
L
±0.009
Basic
-
PLANE
L1
N
-
0.007 C A B
b
0.004 C
Reference
-
Rev. F 2/07
L1
NOTES:
1. Plastic or metal protrusions of 0.006” maximum per side are not
included.
A
2. Plastic interlead protrusions of 0.010” maximum per side are not
included.
c
SEE DETAIL "X"
3. Dimensions “D” and “E1” are measured at Datum Plane “H”.
4. Dimensioning and tolerancing per ASME Y14.5M-1994.
0.010
A2
GAUGE
PLANE
L
A1
4°±4°
DETAIL X
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
FN6301.4
June 23, 2009
19
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