ISL28274FAZ [INTERSIL]
Micropower, Single Supply, Rail-to-Rail Input-Output Instrumentation Amplifier and Precision Operational Amplifier; 微功耗，单电源，轨到轨输入 - 输出仪表放大器和高精度运算放大器
| 型号： | ISL28274FAZ |
| 厂家： | 
Intersil |
| 描述： | Micropower, Single Supply, Rail-to-Rail Input-Output Instrumentation Amplifier and Precision Operational Amplifier |
| 文件： | 总19页 (文件大小：782K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ISL28274, ISL28474
®
Data Sheet
December 13, 2006
FN6345.0
Micropower, Single Supply, Rail-to-Rail
Input-Output Instrumentation Amplifier
and Precision Operational Amplifier
Features
• Combination of IN-AMP and OP-AMP in a single package
• 120µA supply current for ISL28274
• Input Offset Voltage IN-AMP 400µV max
• Input Offset Voltage OP-AMP 225µV max
• 30pA max input bias current
The ISL28274 is a combination of a micropower
instrumentation amplifier (Amp A) with a low power precision
amplifier (Amp B) in a single package. The ISL28474 consist
of two micropower instrumentation amplifiers (Amp A) and
two low power precision amplifiers (Amp B) in a single
package. The amplifiers are optimized for operation at 2.4V
to 5V single supplies. Inputs and outputs can operate rail-to-
rail. As with all instrumentation amplifiers, a pair of inputs
provide a high common-mode rejection and are completely
independent from a pair of feedback terminals. The
feedback terminals allow zero input to be translated to any
output offset, including ground. A feedback divider controls
the overall gain of the amplifier. The additional precision
amplifier can be used to generate higher gain, with smaller
feedback resistors or used to generate a reference voltage.
• 100dB CMRR and PSRR
• Single supply operation of 2.4V to 5.0V
• Ground Sensing
• Input voltage range is rail-to-rail and output swings
rail-to-rail
• Pb-free plus anneal available (RoHS compliant)
Applications
• 4-20mA loops
The instrumentation amp (Amp A) is compensated for a gain
of 100 or more and the precision amp (Amp B) is unity gain
stable. Both amplifiers have PMOS inputs that provide less
than 30pA input bias currents.
• Industrial Process Control
• Medical Instrumentations
The amplifiers can be operated from one lithium cell or two
Ni-Cd batteries. The amplifiers input range goes from below
ground to slightly above positive rail. The output stage
swings completely to ground or positive supply - no pull-up
or pull-down resistors are needed.
Ordering Information
PART NUMBER
(Note)
PART
QTY. PER PACKAGE
PKG.
DWG. #
MARKING TUBE/REEL (Pb-Free)
ISL28274FAZ
28274FAZ
97/Tube 16 Ld QSOP MDP0040
ISL28274FAZ-T7 28274FAZ
7”
16 Ld QSOP MDP0040
(1000 pcs) Tape & Reel
Coming Soon
ISL28474FAZ 55 /Tube 24 Ld QSOP MDP0040
ISL28474FAZ
Coming Soon
ISL28474FAZ
7”
24 Ld QSOP MDP0040
ISL28474FAZ-T7
(1000 pcs) Tape & Reel
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.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2006. All Rights Reserved.
1
All other trademarks mentioned are the property of their respective owners.
ISL28274, ISL28474
ISL28474
(16 LD QSOP)
TOP VIEW
Pinout
ISL28274
(16 LD QSOP)
TOP VIEW
IA OUT_1
IA FB+_1
IA FB-_1
IA IN-_1
IA IN+_1
IA EN_1
V+
1
2
3
4
5
6
7
8
9
24 IA OUT_2
23 IA FB+_2
22 IA FB-_2
21 IA IN-_2
20 IA IN+_2
19 IA EN_2
18 V-
NC
IA OUT
IA FB+
IA FB-
IA IN-
IA IN+
IA EN
V-
1
2
3
4
5
6
7
8
16 V+
15 OUT
14 NC
13 NC
12 IN-
11 IN+
10 EN
A
-
+
A
-
+
A
-
+
B
-
+
EN_1
17 EN_2
9
NC
IN+_1
16 IN+_2
IN-_1 10
NC 11
15 IN-_2
IA = Instrumentation Amplifier
= Instrumentation Amplifier
-
+
-
+
A
-
+
+
14 NC
B
B
13
OUT_1 12
OUT_2
B
-
= Precision Amplifier
IA = Instrumentation Amplifier
= Instrumentation Amplifier
A
-
+
+
B
-
= Precision Amplifier
FN6345.0
December 13, 2006
2
ISL28274, ISL28474
Absolute Maximum Ratings (T = +25°C)
Thermal Information
A
Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V
Supply Turn On Voltage Slew Rate . . . . . . . . . . . . . . . . . . . . . 1V/μs
Input Current (IN, FB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA
Differential Input Voltage (IN, FB) . . . . . . . . . . . . . . . . . . . . . . . 0.5V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . V- - 0.5V to V+ + 0.5V
ESD tolerance, Human Body Model . . . . . . . . . . . . . . . . . . . . . .3kV
ESD tolerance, Machine Model . . . . . . . . . . . . . . . . . . . . . . . . .300V
Thermal Resistance
θ
(°C/W)
JA
16 Ld QSOP Package . . . . . . . . . . . . . . . . . . . . . . .
24 Ld QSOP Package . . . . . . . . . . . . . . . . . . . . . . .
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 . . . . . . . . . . . . . . . . . . . . . +125°C
112
88
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
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 INSTRUMENTATION AMPLIFIER “A” V+ = +5V, V - = GND, VCM = 1/2V + T = +25°C, unless otherwise
S
S
A
specified. For ISL28274 ONLY. Boldface limits apply over the operating temperature range, -40°C to
+125°C.
PARAMETER
DESCRIPTION
Input Offset Voltage
CONDITIONS
MIN
TYP
MAX
UNIT
V
400
35
400
µV
OS
-750
750
TCV
Input Offset Voltage Temperature
Coefficient
Temperature = -40°C to +125°C
0.7
±5
µV/°C
pA
OS
I
Input Offset Current between IN+ and (see Figure 44 for extended temperature range)
IN-, and between FB+ and FB- -40°C to +85°C
-30
-80
30
80
OS
I
Input Bias Current (IN+, IN-, FB+, and (see Figure 36 and 37 for extended temperature
-30
±10
30
pA
B
FB- terminals)
range)
-80
80
-40°C to +85°C
e
Input Noise Voltage
f = 0.1Hz to 10Hz
0.75
210
0.65
1
µV
P-P
N
Input Noise Voltage Density
Input Noise Current Density
Input Resistance
f = 1kHz
nV/√Hz
pA/√Hz
GΩ
o
i
f = 1kHz
o
N
R
IN
IN
V
Input Voltage Range
V
= 2.4V to 5.0V
0
V
V
+
+
CMRR
Common Mode Rejection Ratio
V
= 0V to 5V
80
75
100
100
dB
CM
PSRR
Power Supply Rejection Ratio
V
= 2.4V to 5V
80
dB
+
75
E
Gain Error
Slew Rate
R
R
= 100kΩ to 2.5V
= 1kΩ to GND
-0.2
0.5
%
G
L
SR
0.40
0.65
V/µs
L
0.35
0.70
GBWP
Gain Bandwidth Product
2.5
MHz
Electrical Specifications OPERATIONAL AMPLIFIER “B” V + = +5V, V - = GND, VCM = 1/2V + T = +25°C, unless otherwise
S
S
S
A
specified. For ISL28274 ONLY. Boldface limits apply over the operating temperature range, -40°C to
+125°C.
PARAMETER
DESCRIPTION
Input Offset Voltage
CONDITIONS
MIN
TYP
MAX
UNIT
V
-225
±20
225
µV
OS
-450
450
ΔV
Long Term Input Offset Voltage
Stability
1.2
2.2
±5
µV/Mo
µV/°C
pA
OS
------------------
ΔTime
ΔV
Input Offset Drift vs Temperature
OS
---------------
ΔT
I
Input Offset Current
(see Figure 46 for extended temperature range)
-40°C to +85°C
-30
-80
30
80
OS
FN6345.0
December 13, 2006
3
ISL28274, ISL28474
Electrical Specifications OPERATIONAL AMPLIFIER “B” V + = +5V, V - = GND, VCM = 1/2V + T = +25°C, unless otherwise
S
S
S
A
specified. For ISL28274 ONLY. Boldface limits apply over the operating temperature range, -40°C to
+125°C. (Continued)
PARAMETER
DESCRIPTION
Input Bias Current
CONDITIONS
MIN
TYP
MAX
UNIT
I
(see Figure 40 and 41for extended temperature
-30
±10
30
pA
B
range)
-80
80
-40°C to +85°C
e
Input Noise Voltage Peak-to-Peak
Input Noise Voltage Density
Input Noise Current Density
Input Voltage Range
f = 0.1Hz to 10Hz
5.4
50
µV
PP
N
f
f
= 1kHz
= 1kHz
nV/√Hz
pA/√Hz
V
O
O
i
0.14
N
CMIR
Guaranteed by CMRR test
= 0V to 5V
0
5
CMRR
Common-Mode Rejection Ratio
V
80
75
100
105
dB
CM
PSRR
Power Supply Rejection Ratio
Large Signal Voltage Gain
Slew Rate
V
= 2.4V to 5V
85
80
dB
V/mV
V/µs
kHz
+
A
V
= 0.5V to 4.5V, R = 100kΩ
200
190
300
VOL
O
L
SR
0.12
0.09
±0.14
300
0.16
0.21
GBW
Gain Bandwidth Product
Electrical Specifications COMMON ELECTRICAL SPECIFICATIONS V+ = 5V, V- = GND, VCM = 1/2V + T = 25°C, unless otherwise
S
A
specified.For ISL28274 ONLY. Boldface limits apply over the operating temperature range, -40°C to
+125°C.
PARAMETER
DESCRIPTION
CONDITIONS
Output low, R = 100kΩ
MIN
TYP
MAX
UNIT
V
Maximum Output Voltage Swing
3
6
mV
OUT
L
30
Output low, R = 1kΩ
130
4.996
4.880
120
175
225
mV
V
L
Output high, R = 100kΩ
4.990
4.97
L
Output high, R = 1kΩ
4.800
4.750
V
L
I
I
Supply Current, Enabled
Supply Current, Disabled
ISL28274 All channels enabled
156
µA
S,ON
175
ISL28474 All channels enabled
ISL28274 All channels enabled
240
4
µA
µA
7
S,OFF
9
ISL28474 All channels enabled
8
µA
mA
mA
I
I
+
-
Short Circuit Sourcing Capability
Short Circuit Sinking Capability
R
R
= 10Ω
= 10Ω
28
25
31
26
SC
L
L
24
SC
20
V
V
V
Minimum Supply Voltage
Enable Pin High Level
Enable Pin Low Level
Enable Pin Input Current
2.4
2
V
V
S
INH
INL
0.8
V
I
V
V
= 5V
= 0V
0.8
1
1.3
µA
ENH
EN
EN
I
Enable Pin Input Current
0
50
µA
ENL
26
100
FN6345.0
December 13, 2006
4
ISL28274, ISL28474
Typical Performance Curves
90
90
80
70
60
50
40
30
COMMON-MODE INPUT = V+
COMMON-MODE INPUT = 1/2V
+
GAIN = 10,000
GAIN = 5,000
GAIN = 10,000
GAIN = 5,000
80
70
60
50
40
30
GAIN = 2,000
GAIN = 1,000
GAIN = 500
GAIN = 2,000
GAIN = 1,000
GAIN = 500
GAIN = 200
GAIN = 100
GAIN = 200
GAIN = 100
1
10
100
1k
10k
100k
1M
1
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 1. AMPLIFIER “A”(INAMP) FREQUENCY
RESPONSE vs CLOSED LOOP GAIN
FIGURE 2. AMPLIFIER “A”(INAMP) FREQUENCY RESPONSE
vs CLOSED LOOP GAIN. V = 1/2V+
CM
45
40
35
30
25
20
15
10
5
90
COMMON-MODE INPUT = V +10mV
GAIN = 10,000
M
V
= 5V
S
80
70
60
50
40
30
GAIN = 5,000
GAIN = 2,000
GAIN = 1,000
GAIN = 500
V = 2.4V
S
A
R
C
= 100
= 10kΩ
= 10pF
V
L
L
F
F
G
GAIN = 200
GAIN = 100
R /R = 100
R
R
G
= 10kΩ
= 100Ω
0
10
100
1k
10k
100k
1M
1
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 4. AMPLIFIER “A”(INAMP) FREQUENCY
RESPONSE vs SUPPLY VOLTAGE
FIGURE 3. AMPLIFIER “A”(INAMP) FREQUENCY
RESPONSE vs CLOSED LOOP GAIN
120
100
80
50
45
2200pF
1200pF
40
35
30
25
60
820pF
AV = 100
40
A
= 100
V
R = 10kΩ
C
R /R = 100
R
R
56pF
= 10pF
L
20
0
F
F
G
G
= 10kΩ
= 100Ω
10
100
1k
10k
100k
1M
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 6. AMPLIFIER “A”(INAMP) CMRR vs FREQUENCY
FIGURE 5. AMPLIFIER “A”(INAMP) FREQUENCY
RESPONSE vs C
LOAD
FN6345.0
December 13, 2006
5
ISL28274, ISL28474
Typical Performance Curves (Continued)
700
600
500
400
300
200
100
0
120
100
80
60
40
20
0
PSRR+
PSRR-
A
= 100
V
A
= 100
100
V
1
10
100
1k
10k
100k
10
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 8. AMPLIFIER “A”(INAMP) INPUT VOLTAGE NOISE
SPECTRAL DENSITY
FIGURE 7. AMPLIFIER “A”(INAMP) PSRR vs FREQUENCY
2.0
1.8
1.6
1.4
1.2
1.0
0.8
A
= 100
V
0.6
0.4
0.2
0.0
10k
1
10
100
1k
100k
TIME (1s/DIV)
FREQUENCY (Hz)
FIGURE 9. AMPLIFIER “A”(INAMP) INPUT CURRENT NOISE
SPECTRAL DENSITY
FIGURE 10. AMPLIFIER “A”(INAMP) 0.1 Hz TO 10Hz INPUT
VOLTAGE NOISE
45
40
35
30
+1
0
V
= ±1.2V
RL = 1k
S
V
= ±2.5V
RL = 1k
S
-1
-2
-3
-4
-5
-6
-7
8
V
= ±1.2V
RL = 10k
S
V
= ±2.5V
S
V
= ±2.5V
RL = 10k
25
20
15
10
5
S
V
= ±1.2V
S
A
= 100
= 10kΩ
= 3pF
= 100kΩ
= 1kΩ
V
R
C
R
R
V
= 50mVp-p
L
L
F
G
OUT
= 1
A
V
C
= 3pF
V
= ±1.0V
10k
L
F
S
R =0/R = INF
G
0
100
1k
100k
1M
1k
10k
100k
FREQUENCY (Hz)
1M
5M
FREQUENCY (Hz)
FIGURE 11. AMPLIFIER “B” (OP-AMP) FREQUENCY
RESPONSE vs SUPPLY VOLTAGE
FIGURE 12. AMPLIFIER “B” (OP-AMP) FREQUENCY
RESPONSE vs SUPPLY VOLTAGE
FN6345.0
December 13, 2006
6
ISL28274, ISL28474
Typical Performance Curves (Continued)
100
80
0
-20
V
= V /2
DD
CM
60
V
, µV
OS
40
20
-40
V
= 5V
DD
0
-20
-40
-60
-80
-100
-60
V
= 2.5V
DD
-80
-100
0
1
2
3
4
5
0
1
2
3
4
5
OUTPUT VOLTAGE (V)
COMMON-MODE INPUT VOLTAGE (V)
FIGURE 13. AMPLIFIER “B” (OP-AMP) INPUT OFFSET
VOLTAGE vs OUTPUT VOLTAGE
FIGURE 14. AMPLIFIER “B” (OP-AMP) INPUT OFFSET
VOLTAGE vs COMMON-MODE INPUT VOLTAGE
120
80
80
200
150
100
80
60
40
20
0
40
PHASE
100
50
40
0
0
0
-40
-80
-120
GAIN
10k
-50
-100
-150
-40
-80
-20
10
1
10
100
1k
10k
100k
1M
10M
100
1k
100k
VOL
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 15. AMPLIFIER “B” (OP-AMP) A
vs FREQUENCY
FIGURE 16. AMPLIFIER “B” (OP-AMP) A
vs FREQUENCY
VOL
@ 100kΩ LOAD
@ 1kΩ LOAD
10
0
10
V
V
= 5VDC
S
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
V
= ±2.5VDC
= 1Vp-p
= 10kΩ
= 1Vp-p
S
SOURCE
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
V
SOURCE
R
= 10kΩ
= +1
L
R
L
A
V
PSRR -
PSRR +
10
100
1k
10k
100k
1M
10
100
1k
10k
100k
1M
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 17. AMPLIFIER “B” (OP-AMP) PSRR vs FREQUENCY
FIGURE 18. AMPLIFIER “B” (OP-AMP) CMRR vs FREQUENCY
FN6345.0
December 13, 2006
7
ISL28274, ISL28474
Typical Performance Curves (Continued)
2.56
2.54
2.52
2.50
2.48
2.46
2.44
2.42
5.0
4.0
3.0
2.0
1.0
0
V
= 5VDC
= 2Vp-p
S
V
IN
V
R
OUT
= 1kΩ
V
OUT
L
A
= -2
V
V
OUT
V
= 5VDC
V
S
IN
V
= 0.1Vp-p
OUT
= 1kΩ
R
L
A
= +1
V
0
2
4
6
8
10
12
14
16
18
20
0
50
100
150
200
250
TIME (µs)
TIME (µs)
FIGURE 19. AMPLIFIER “B” (OP-AMP) SMALL SIGNAL
TRANSIENT RESPONSE
FIGURE 20. AMPLIFIER “B” (OP-AMP) LARGE SIGNAL
TRANSIENT RESPONSE
1k
100
10
10.00
1.00
0.10
0.01
1
1
10
100
1k
10k
100k
1
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 21. AMPLIFIER “B” (OP-AMP) CURRENT NOISE vs
FREQUENCY
FIGURE 22. AMPLIFIER “B” (OP-AMP) VOLTAGE NOISE vs
FREQUENCY
6
V+ = 5V
V
IN
5
4
3
2
1
0
100K
VS +
100K
-
DUT
+
1K
VS -
V
OUT
Function
Generator
33140A
5.4µV
P-P
0
50
100
150
200
TIME (1s/DIV)
TIME (ms)
FIGURE 23. AMPLIFIER “B” (OP-AMP) 0.1Hz TO 10Hz INPUT
VOLTAGE NOISE
FIGURE 24. AMPLIFIER “B” (OP-AMP) INPUT VOLTAGE
SWING ABOVE THE V+ SUPPLY
FN6345.0
December 13, 2006
8
ISL28274, ISL28474
Typical Performance Curves (Continued)
155
135
115
95
A
= -1
= 200mVp-p
V
EN
INPUT
V
IN
V+ = 5V
V- = 0V
0
0
75
V
OUT
55
35
2
2.5
3
3.5
4
4.5
5
5.5
10µs/DIV
SUPPLY VOLTAGE (V)
FIGURE 25. SUPPLY CURRENT vs SUPPLY VOLTAGE
FIGURE 26. AMPLIFIER “B” (OP-AMP) ENABLE TO OUTPUT
DELAY TIME
5.0
170
n = 100
MAX
n = 100
4.8
160
MAX
4.6
150
4.4
4.2
4.0
3.8
140
130
120
110
100
90
MEDIAN
3.6
MEDIAN
3.4
MIN
3.2
MIN
3.0
80
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 28. DISABLED POSITIVE SUPPLY CURRENT vs
TEMPERATURE V = ±2.5V. R = INF
FIGURE 27. TOTAL SUPPLY CURRENT vs TEMPERATURE
V
= ±2.5V ENABLED. R = INF
S
L
S
L
-4.0
-4.5
-5.0
-5.5
-6.0
-6.5
50
0
n = 100
MIN
n = 100
MAX
-50
MEDIAN
-100
-150
-200
-250
-300
MEDIAN
MIN
MAX
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 30. I BIAS (IA FB+) vs TEMPERATURE V = ±2.5V.
FIGURE 29. DISABLED NEGATIVE SUPPLY CURRENT vs
TEMPERATURE V = ±2.5V. R = INF
S
S
L
FN6345.0
December 13, 2006
9
ISL28274, ISL28474
Typical Performance Curves (Continued)
25
-25
40
20
n = 100
MIN
n = 100
0
-20
-40
-60
-80
-100
-120
-140
-160
MIN
-75
-125
-175
-225
-275
MEDIAN
MAX
MEDIAN
MAX
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 31. I BIAS (IA FB-) vs TEMPERATURE V = ±2.5V.
S
FIGURE 32. I BIAS (IA FB+) vs TEMPERATURE V = ±1.2V
S
50
50
n = 100
n = 100
0
0
-50
MEDIAN
MIN
-50
MIN
-100
-100
-150
-200
-250
MEDIAN
-150
MAX
-200
-250
MAX
-300
-350
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 33. I BIAS (IA FB-) vs TEMPERATURE V = ±1.2V
S
FIGURE 34. I BIAS (IA IN+) vs TEMPERATURE V = ±2.5V
S
50
50
n = 100
n = 100
0
0
-50
-50
MIN
MIN
-100
-150
-100
-150
MEDIAN
MEDIAN
-200
-200
MAX
MAX
-250
-250
-300
-300
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 36. I BIAS (IA IN+) vs TEMPERATURE V = ±1.2V
FIGURE 35. I BIAS (IA IN-) vs TEMPERATURE V = ±2.5V
S
S
FN6345.0
December 13, 2006
10
ISL28274, ISL28474
Typical Performance Curves (Continued)
50
0
50
0
n = 100
n = 100
-50
-50
MIN
MIN
-100
-150
-200
-250
-100
-150
-200
-250
MEDIAN
MEDIAN
MAX
MAX
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 38. I BIAS(IN+) vs TEMPERATURE V = ±2.5V
S
FIGURE 37. I BIAS (IA IN-) vs TEMPERATURE V = ±1.2V
S
40
30
n = 100
n = 100
10
-10
-10
-30
-60
MIN
-110
-50
MIN
-70
-160
-210
-260
-310
MEDIAN
-90
MEDIAN
-110
MAX
MAX
-130
-150
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 40. I BIAS(IN+) vs TEMPERATURE V = ±1.2V
S
FIGURE 39. I BIAS(IN-) vs TEMPERATURE V = ±2.5V
S
40
40.0
MAX
n = 100
n = 100
20.0
0.0
-10
-60
MIN
MIN
-20.0
-40.0
-60.0
-80.0
-100.0
-120.0
-140.0
MEDIAN
-110
-160
-210
-260
-310
MAX
MEDIAN
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
TEMPERATURE (°C)
FIGURE 42. IA INPUT OFFSET CURRENT vs TEMPERATURE
= ±2.5V
40
60
80
100 120
TEMPERATURE (°C)
FIGURE 41. I BIAS(IN-) vs TEMPERATURE V = ±1.2V
S
V
S
FN6345.0
December 13, 2006
11
ISL28274, ISL28474
Typical Performance Curves (Continued)
100
50
50
40
n = 100
n = 100
MAX
30
20
0
10
MAX
-50
0
-10
-20
-30
-40
-50
MEDIAN
-100
-150
-200
MEDIAN
80
MIN
MIN
-40
-20
0
20
40
60
100
120
-40
-20
0
20
40
60
80
100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 43. IA INPUT OFFSET CURRENT vs TEMPERATURE
= ±1.2V
FIGURE 44. INPUT OFFSET CURRENT vs TEMPERATURE
V
V
= ±2.5V
S
S
40
20
800
600
400
200
0
n = 100
MIN
n = 100
MAX
0
-20
-40
-60
-200
-400
-600
-800
MEDIAN
-80
-100
-120
-1400
MEDIAN
MIN
MAX
-40
-20
0
20
TEMPERATURE (°C)
FIGURE 45. INPUT OFFSET CURRENT vs TEMPERATURE
= ±1.2V
40
60
80
100 120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
FIGURE 46. IA INPUT OFFSET VOLTAGE vs TEMPERATURE
= ±2.5V
V
S
V
S
800
600
400
200
0
500
400
300
200
100
0
n = 100
n = 100
MIN
MIN
-100
-200
-300
-400
-500
MEDIAN
-200
-400
-600
-800
MEDIAN
MAX
MAX
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 47. IA INPUT OFFSET VOLTAGE vs TEMPERATURE
= ±1.2V
FIGURE 48. INPUT OFFSET VOLTAGE vs TEMPERATURE
= ±2.5V
V
V
S
S
FN6345.0
December 13, 2006
12
ISL28274, ISL28474
Typical Performance Curves (Continued)
500
400
300
200
100
0
145
135
125
115
105
95
n = 100
n = 100
MIN
MIN
MEDIAN
-100
-200
-300
-400
-500
MEDIAN
85
MAX
MAX
75
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 49. INPUT OFFSET VOLTAGE vs TEMPERATURE
FIGURE 50. IA CMRR vs TEMPERATURE VCM = +2.5V TO
-2.5V
V
= ±1.2V
S
140
130
120
110
100
90
155
n = 100
145
n = 100
MIN
135
MIN
125
115
MEDIAN
MEDIAN
105
95
MAX
MAX
85
80
75
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 51. CMRR vs TEMPERATURE VCM = +2.5V TO -2.5V
FIGURE 52. IA PSRR vs TEMPERATURE V = ±2.5V
S
4.910
n = 100
n = 100
155
145
135
125
115
105
95
4.900
4.890
4.880
4.870
4.860
4.850
4.840
MIN
MIN
MEDIAN
MEDIAN
MAX
MAX
85
75
-40
-40
-20
0
20
40
60
80
100
120
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 54. IA V
HIGH vs TEMPERATURE R = 1k.
L
FIGURE 53. PSRR vs TEMPERATURE V = ±2.5V
S
OUT
V
= ±2.5V
S
FN6345.0
December 13, 2006
13
ISL28274, ISL28474
Typical Performance Curves (Continued)
4.9980
4.9975
4.9970
4.9965
4.9960
4.9955
4.9950
170
160
150
140
130
120
110
100
90
n = 100
n = 100
MIN
MIN
MEDIAN
MEDIAN
MAX
MAX
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 55. IA V
HIGH vs TEMPERATURE R = 100k.
L
FIGURE 56. IA VOUT LOW vs TEMPERATURE R = 1k.
OUT
L
V
= ±2.5V
V
= ±2.5V
S
S
6.5
6.0
5.5
5.0
4.5
4.0
3.5
4.910
4.900
4.890
4.880
4.870
4.860
4.850
n = 100
n = 100
MIN
MIN
MEDIAN
MEDIAN
MAX
MAX
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 57. IA V
OUT
LOW vs TEMPERATURE R = 100k.
FIGURE 58. V
V = ±2.5V
S
HIGH vs TEMPERATURE R = 1k.
L
OUT L
V
= ±2.5V
S
170
4.9986
4.9984
4.9982
4.9980
4.9978
4.9976
4.9974
4.9972
4.9970
4.9968
4.9966
n = 100
n = 100
160
150
140
130
120
110
100
90
MIN
MIN
MEDIAN
MEDIAN
MAX
MAX
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 59. V
V
HIGH vs TEMPERATURE R = 100k.
L
= ±2.5V
FIGURE 60. V
LOW vs TEMPERATURE R = 1k. V = ±2.5V
L S
OUT
OUT
S
FN6345.0
December 13, 2006
14
ISL28274, ISL28474
Typical Performance Curves (Continued)
n = 100
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
MIN
MEDIAN
MAX
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
FIGURE 61. V T LOW vs TEMPERATURE R = 100k. V = ±2.5V
OU
L
S
Pin Descriptions
ISL28274
(16 LD QSOP) (24 LD QSOP)
ISL28474
EQUIVALENT
CIRCUIT
PIN NAME
DESCRIPTION
1, 9, 13, 14
11, 14
NC
No internal connection
2
IA OUT
IA OUT_1/2
Circuit 3
Circuit 1
Circuit 1
Circuit 1
Circuit 1
Circuit 2
Instrumentation Amplifier output
1, 24
3
IA FB+
IA FB+_1/2
Instrumentation Amplifier Feedback from non-inverting output
Instrumentation Amplifier Feedback from inverting output
Instrumentation Amplifier inverting input
2, 23
4
IA FB-
IA FB-_1/2
3, 22
5
IA IN-
IA IN-_1/2
4, 21
6
IA IN+
IA IN+_1/2
Instrumentation Amplifier non-inverting input
5, 20
7
IA EN
IA EN_1/2
Instrumentation Amplifier enable pin internal pull-down; Logic “1” selects
the disabled state; Logic “0” selects the enabled state.
6, 19
8
18
V-
Circuit 4
Circuit 2
Negative power supply
10
EN
EN 1/2
Amplifier enable pin with internal pull-down; Logic “1” selects the
disabled state; Logic “0” selects the enabled state.
8, 17
9, 16
10, 15
11
12
15
16
IN+
IN+ 1/2
Circuit 1
Circuit 1
Circuit 3
Circuit 4
Amplifier non-inverting input
Amplifier inverting input
Amplifier output
IN-
IN- 1/2
OUT
OUT 1/2
12, 13
7
V+
Positive power supply
IA = Instrumentation Amplifier
V+
V-
V+
V+
V+
CAPACITIVELY
COUPLED
ESD CLAMP
LOGIC
PIN
OUT
IN-
IN+
V-
V-
V-
CIRCUIT 1
CIRCUIT 2
CIRCUIT 3
CIRCUIT 4
FN6345.0
December 13, 2006
15
ISL28274, ISL28474
of the ISL28274 in-amp is to maintain the differential voltage
Description of Operation and Application
Information
across FB+ and FB- equal to IN+ and IN-; (FB+ - FB-) =
(IN+ - IN-). Consequently, the transfer function can be
derived. The gain is set by two external resistors, the
feedback resistor RF, and the gain resistor RG.
Product Description
The ISL28274 and ISL28474 provide both a micropower
instrumentation amplifier (Amp A) and a low power precision
amplifier (Amp B) in the same package. The amplifiers
deliver rail-to-rail input amplification and rail-to-rail output
swing on a single 2.4V to 5V supply. They also deliver
excellent DC and AC specifications while consuming only
60µA typical supply current per amplifier. Because the
instrumentation amplifiers provide an independent pair of
feedback terminals to set the gain and to adjust the output
level, the in-amp achieve high common-mode rejection ratio
regardless of the tolerance of the gain setting resistors. The
instrumentation amplifier is internally compensated for a
minimum closed loop gain of 100 or greater. An EN pin is
used to reduce power consumption, typically 4µA for the
ISL28274 and 8µA for the ISL28474, while both amplifiers
are disabled. The user has independent control of each
amplifier via separate EN pins.
2.4V to 5V
EN_BAR
16
7
VIN/2
VIN/2
Amp “A”
VS+
EN
6
5
3
4
IN+
IN-
+
-
2
VOUT
ISL28274
FB+
FB-
+
-
VCM
VS-
8
RG
RF
FIGURE 62. GAIN IS BY EXTERNAL RESISTORS R AND R
F
G
Input Protection
R
⎛
⎞
⎟
⎠
F
--------
VOUT = 1 +
VIN
⎜
The input and feedback terminals have internal ESD
protection diodes to both positive and negative supply rails,
limiting the input voltage to within one diode drop beyond the
supply rails. If overdriving the inputs is necessary, the
external input current must never exceed 5mA. External
series resistor may be used as a protection to limit excessive
external voltage and current from damaging the inputs.
R
G
⎝
In Figure 62, the FB+ pin and one end of resistor RG are
connected to GND. With this configuration, the above gain
equation is only true for a positive swing in VIN; negative
input swings will be ignored and the output will be at ground.
Reference Connection
Input Stage and Input Voltage Range
Unlike a three-opamp instrumentation amplifier, a finite
series resistance seen at the REF terminal does not degrade
the high CMRR performance eliminating the need for an
additional external buffer amplifier. Figure 63 uses the FB+
pin to provide a high impedance REF terminal.
The input terminals (IN+ and IN-) of both amplifiers “A” and
amp “B” are single differential pair P-MOSFET devices aided
by an Input Range Enhancement Circuit to increase the
headroom of operation of the common-mode input voltage.
The feedback terminals (FB+ and FB-) of amplifier “A” also
have a similar topology. As a result, the input common-mode
voltage range is rail-to-rail. These amps are able to handle
input voltages that are at or slightly beyond the supply and
ground making them well suited for single 5V or 3.3V low
voltage supply systems. There is no need then to move the
common-mode input to achieve symmetrical input voltage.
2.4V to 5V
EN_BAR
16
7
VIN/2
VIN/2
VS+
EN
6
5
3
4
IN+
IN-
Amp “A”
+
-
2
VOUT
ISL28274
FB+
FB-
+
-
VCM
2.9V to 5V
VS-
8
Output Stage and Output Voltage Range
A pair of complementary MOSFET devices drives the output
VOUT to within a few mV of the supply rails. At a 100kΩ
load, the PMOS sources current and pulls the output up to
4mV below the positive supply, while the NMOS sinks
current and pulls the output down to 3mV above the negative
supply, or ground in the case of a single supply operation.
The current sinking and sourcing capability of the ISL28274
are internally limited to 31mA.
R1
R2
REF
RG
RF
FIGURE 63. GAIN SETTING AND REFERENCE CONNECTION
R
R
F
R
G
⎛
⎞
⎟
⎠
⎛
⎞
⎟
⎠
F
--------
--------
VOUT = 1 +
(VIN) + 1 +
(VREF)
⎜
⎜
Gain Setting of Instrumentation amp “A”
R
G
⎝
⎝
VIN, the potential difference across IN+ and IN-, is replicated
(less the input offset voltage) across FB+ and FB-. The goal
FN6345.0
December 13, 2006
16
ISL28274, ISL28474
The FB+ pin is used as a REF terminal to center or to adjust
amplifiers will power down when EN bar is pulled above 2V,
and will power on when EN bar is pulled below 0.8V.
the output. Because the FB+ pin is a high impedance input,
an economical resistor divider can be used to set the voltage
at the REF terminal without degrading or affecting the CMRR
performance. Any voltage applied to the REF terminal will
shift VOUT by VREF times the closed loop gain, which is set
by resistors RF and RG as shown in Figure 63.
Using Only the Instrumentation Amplifier
If the application only requires the instrumentation amp, the
user must configure the unused Opamp to prevent it from
oscillating. The unused Opamp 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 in-amp. 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 65).
The FB+ pin can also be connected to the other end of resistor,
RG. See Figure 64. Keeping the basic concept that the in-amps
maintain constant differential voltage across the input terminals
and feedback terminals (IN+ - IN- = FB+ - FB-), the transfer
function of Figure 64 can be derived.
-
2.4V to 5V
EN_BAR
+
16
7
VIN/2
VIN/2
VS+
EN
6
5
3
4
IN+
IN-
Amp “A”
+
FIGURE 65. PREVENTING OSCILLATIONS IN UNUSED
CHANNELS
-
2
VOUT
ISL28274
FB+
FB-
+
-
VCM
Proper Layout Maximizes Performance
VS-
8
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 66 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.
RG
RF
VREF
FIGURE 64. REFERENCE CONNECTION WITH AN AVAILABLE
VREF
R
⎛
⎞
⎟
⎠
F
--------
VOUT = 1 +
(VIN) + (VREF)
⎜
R
G
⎝
A finite resistance Rs in series with the VREF source, adds
an output offset of VIN*(RS/RG). As the series resistance Rs
approaches zero, the gain equation is simplified to the above
equation for Figure 64. VOUT is simply shifted by an amount
VREF.
External Resistor Mismatches
V+
HIGH IMPEDANCE INPUT
1/2 ISL28274
1/4 ISL28474
Because of the independent pair of feedback terminals
provided by the ISL28274, the CMRR is not degraded by
any resistor mismatches. Hence, unlike a three opamp and
especially a two opamp in-amp, the ISL28274 reduce the
cost of external components by allowing the use of 1% or
more tolerance resistors without sacrificing CMRR
performance. The ISL28274 CMRR will be 100dB
regardless of the tolerance of the resistors used.
IN
FIGURE 66. GUARD RING EXAMPLE FOR UNITY GAIN
AMPLIFIER
Disable/Power-Down
The ISL28274 Amplifiers “A” and “B” can be powered down
reducing the supply current to typically 4µA. When disabled,
the output is in a high impedance state. The active low EN
bar pin has an internal pull down and hence can be left
floating and the in-amp and Opamp enabled by default.
When the EN bar is connected to an external logic, the
Current Limiting
The ISL28274 has 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.
FN6345.0
December 13, 2006
17
ISL28274, ISL28474
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 in Equation 1:
T
= T
+ (θ xPD
)
MAXTOTAL
(EQ. 1)
JMAX
MAX
JA
where:
• PD
is the sum of the maximum power
MAX
for each amplifier can be calculated as shown in
MAXTOTAL
dissipation of each amplifier in the package (PD
)
• PD
MAX
Equation 2:
V
OUTMAX
R
L
----------------------------
PD
= 2*V × I
+ (V - V ) ×
OUTMAX
MAX
S
SMAX
S
(EQ. 2)
where:
• T
MAX
= Maximum ambient temperature
• θ = Thermal resistance of the package
JA
• PD
= Maximum power dissipation of 1 amplifier
• V = Supply voltage
MAX
S
• I
MAX
= Maximum supply current of 1 amplifier
= Maximum output voltage swing of the
• V
OUTMAX
application
• R = Load resistance
L
FN6345.0
December 13, 2006
18
ISL28274, ISL28474
Quarter Size Outline Plastic Packages Family (QSOP)
A
MDP0040
QUARTER SIZE OUTLINE PLASTIC PACKAGES FAMILY
D
(N/2)+1
N
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
-
-
c
-
1
(N/2)
D
1, 3
B
E
-
0.010 C A B
E1
e
2, 3
e
-
H
L
±0.009
Basic
-
C
SEATING
L1
N
-
PLANE
Reference
-
0.007 C A B
b
0.004 C
Rev. E 3/01
NOTES:
1. Plastic or metal protrusions of 0.006” maximum per side are not
included.
L1
2. Plastic interlead protrusions of 0.010” maximum per side are not
included.
A
3. Dimensions “D” and “E1” are measured at Datum Plane “H”.
4. Dimensioning and tolerancing per ASME Y14.5M-1994.
c
SEE DETAIL "X"
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
FN6345.0
December 13, 2006
19
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