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PDF ISL28271 Data sheet ( Hoja de datos )
| Número de pieza | ISL28271 | |
| Descripción | (ISL28271 / ISL28272) Rail-to- Rail Input and Output (RRIO) Instrumentation Amplifier | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
ISL28271, ISL28272
December 8, 2006
FN6390.0
Dual Micropower, Single Supply, Rail-to-
Rail Input and Output (RRIO)
Instrumentation Amplifier
The ISL28271 and ISL28272 are dual micropower
instrumentation amplifiers (in-amps) optimized for low 2.4V
to 5V single supplies.
Both devices feature an Input Range Enhancement Circuit
(IREC) which maintains CMRR performance for input
voltages equal to the positive and negative supply rails. The
input signal is capable of swinging 10% above the positive
supply rail and to 100mV below the negative supply with only
a slight degradation of the CMRR performance. The output
operation is rail to rail.
The ISL28271 is compensated for a minimum gain of 10 or
more. For higher gain applications, the ISL28272 is
compensated for a minimum gain of 100. The in-amps have
CMOS input devices for maximum input common voltage
range. The amplifiers can be operated from one lithium cell
or two Ni-Cd batteries.
Ordering Information
www.DataSheet4U.com PART NUMBER
PART
TAPE & PACKAGE PKG.
(Note)
MARKING REEL (Pb-Free) DWG. #
ISL28271FAZ
(Note)
28271 FAZ 97/Tube 16 Ld QSOP MDP0040
(Pb-free)
ISL28271FAZ-T7 28271 FAZ
7” 16 Ld QSOP MDP0040
(Note)
(1000 pcs) (Pb-free)
ISL28272FAZ
(Note)
28272 FAZ 97/Tube 16 Ld QSOP MDP0040
(Pb-free)
ISL28272FAZ-T7 28272 FAZ
7” 16 Ld QSOP MDP0040
(Note)
(1000 pcs) (Pb-free)
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.
Features
• 120µA typical supply current for both channels
• 30pA max input bias current
• 100dB CMRR, PSRR
• 0.7µV/°C offset voltage temperature coefficient
• 180kHz 3dB Bandwidth - ISL28271
• 100kHz 3dB Bandwidth - ISL28272
• 0.5V/µs slew rate
• Single supply operation
• Rail-to-rail input and output (RRIO)
• Input is capable of swinging above V+ and below V-
(ground sensing)
• 0.081%1 typical gain error - ISL28271
• -0.19%1 typical gain error - ISL28272
• Pb-free plus anneal available (RoHS compliant)
Applications
• Battery- or solar-powered systems
• Strain gauge
• Sensor signal conditioning
• Medical devices
• Industrial instrumentations
Pinout
ISL28271, ISL28272
(16 LD QSOP)
TOP VIEW
NC 1
OUT_A 2
FB+_A 3
FB-_A 4
IN-_A 5
IN+_A 6
EN_A 7
V- 8
+-
16 V+
15 OUT_B
14 FB+_B
-+
13 FB-_B
12 IN-_B
11 IN+_B
10 EN_B
9 NC
1 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.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL28271, ISL28272
Typical Performance Curves (Continued)
25
VS = 5V
20
VS = 2.4V
15
10
AV = 10
RL = 10kΩ
5
CL = 10pF
RF/RG = 10
RF = 1kΩ
0 RG = 100Ω
10 100
1k 10k
FREQUENCY (Hz)
100k
1M
FIGURE 7. ISL28271 FREQUENCY RESPONSE vs SUPPLY
VOLTAGE
45
40
35
30
25
20
15
AV = 100
RL = 10kΩ
10
CL = 10pF
RF/RG = 100
5 RF = 10kΩ
RG = 100Ω
0
10 100
VS = 5V
VS = 2.4V
1k 10k
FREQUENCY (Hz)
100k
1M
FIGURE 8. ISL28272 FREQUENCY RESPONSE vs SUPPLY
VOLTAGE
25
820pF
470pF
20
220pF
15
AV = 10
R = 10kΩ
10 CL = 10pF
RF/RG = 10
RF = 1kΩ
5 RG = 100Ω
10 100
1k 10k
FREQUENCY (Hz)
100pF
100k
1M
FIGURE 9. ISL28271 FREQUENCY RESPONSE vs CLOAD
50
45 2200pF
1200pF
40
35
AV = 100
R = 10kΩ
30
CL = 10pF
RF/RG = 100
RF = 10kΩ
25 RG = 100Ω
10 100
820pF
56pF
1k 10k
FREQUENCY (Hz)
100k
1M
FIGURE 10. ISL28272 FREQUENCY RESPONSE vs CLOAD
90
80
70
60
50
40
AV = 10
30
20
10
0
-10
10
100
1k 10k 100k
FREQUENCY (Hz)
1M
FIGURE 11. ISL28271 CMRR vs FREQUENCY
120
100
80
60
AV = 100
40
20
0
10
100
1k
10k 100k
1M
FREQUENCY (Hz)
FIGURE 12. ISL28272 CMRR vs FREQUENCY
5 FN6390.0
December 8, 2006
5 Page 
ISL28271, ISL28272
Application Information
Product Description
The ISL28271 and ISL28272 are dual channel micropower
instrumentation amplifiers (in-amps) which deliver rail-to-rail
input amplification and rail-to-rail output swing. The in-amps
also deliver excellent DC and AC specifications while
consuming only about 120µA for both channels. Because
the independent pair of feedback terminals set the gain and
adjust the output zero level, the ISL28271 and ISL28272
achieve high CMRR regardless of the tolerance of the gain
setting resistors. The ISL28271 is internally compensated for
a minimum gain of 10. The ISL28272 is internally
compensated for a minimum gain of 100.
EN pins are available to independently enable or disable a
channel. When all channels are off, current consumption is
down to typically 4µA.
Input Protection
All input terminals and feedback terminals have internal ESD
protection diodes to both positive and negative supply rails,
limiting the input voltage to within one diode beyond the
supply rails. Input signals originating from low impedance
sources should have current limiting resistors in series with
the IN+ and IN- pins to prevent damaging currents during
power supply sequencing and other transient conditions.
The ISL28272 has additional back-to-back diodes across the
input terminals and also across the feedback 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. On the other
hand, the ISL28271 has no clamps to limit the differential
voltage on the input terminals allowing higher differential
input voltages at lower gain applications. It is recommended
however, that the terminals of the ISL28271 are not
overdriven beyond 1V to avoid offset drift.
Input Stage and Input Voltage Range
The input terminals (IN+ and IN-) of the in-amps are a single
differential pair of CMOS devices aided by an Input Range
Enhancement Circuit, IREC, to increase the headroom of
operation of the common-mode input voltage. The feedback
terminals (FB+ and FB-) also have a similar topology. As a
result, the input common-mode voltage range is rail-to-rail
regardless of the feedback terminal settings and regardless
of the gain settings. They are able to handle input voltages
that are at or slightly beyond the supply and ground sensing
making these in-amps well suited for single 5V down to 2.4V
supply systems.
The IREC enables rail-to-rail input amplification without the
problems usually associated with the dual differential stage
topology. The IREC ensures that there are no drastic
changes in offset voltage over the entire range of the input.
See Input Offset Voltage vs Common-Mode Input Voltage in
performance charts. IREC also cures the abrupt change and
even reverse polarity of the input bias current over the whole
range of input.
Output Stage and Output Voltage Range
A Class AB common-source output stage drives the output.
The pair of complementary MOSFET devices drive the
output VOUT to within a few millivolts of the supply rails. At a
100kΩ load, the PMOS sources current and pulls the output
up to 4mV below the positive supply. The NMOS sinks
current and pulls the output down to 4mV above the negative
supply, or ground in the case of a single supply operation.
The current sinking and sourcing capability are internally
limited to 31mA. When disabled, the outputs are in a high
impedance state.
Gain Setting
VIN, the potential difference across IN+ and IN-, is replicated
(less the input offset voltage) across FB+ and FB-. The
function of the in-amp is to maintain the differential voltage
across FB- and FB+ equal to IN+ and IN-; (FB- - FB+) =
(IN+ - IN-). Consequently, the transfer function can be
derived. The in-amp gain is set by two external resistors, the
feedback resistor RF, and the gain resistor RG.
2.4V to 5V
EN
IN+
IN-
VCM
IN+
+
IN-
-
FB+
+
FB-
-
V+ EN
V-
ISL28271
ISL28272
VOUT
RG RF
FIGURE 37. GAIN IS SET BY TWO EXTERNAL RESISTORS,
RF AND RG
VIN = IN+ – IN-
VOUT
=
⎛
⎜1
⎝
+
R-R----G-F--⎠⎟⎞
VIN
(EQ. 1)
In Figure 37, the FB+ pin and one end of resistor RG are
connected to GND. With this configuration, the above gain
equation (Equation 1) is only true for a positive swing in VIN;
negative input swings will be ignored because the output will
be at ground.
Reference Connection
Unlike a three op-amp in-amp realization, a finite series
resistance seen at the REF terminal does not degrade the
high CMRR performance eliminating the need for an
11 FN6390.0
December 8, 2006
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ISL28271.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ISL28270 | (ISL28270 - ISL28470) Rail-to-Rail Input and Output (RRIO) Instrumentation Amplifier | Intersil Corporation |
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| ISL28272 | (ISL28271 / ISL28272) Rail-to- Rail Input and Output (RRIO) Instrumentation Amplifier | Intersil Corporation |
| ISL28273 | (ISL28270 - ISL28470) Rail-to-Rail Input and Output (RRIO) Instrumentation Amplifier | Intersil Corporation |
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