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PDF ISL28273 Data sheet ( Hoja de datos )
| Número de pieza | ISL28273 | |
| Descripción | (ISL28270 - ISL28470) Rail-to-Rail Input and Output (RRIO) Instrumentation Amplifier | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
ISL28270, ISL28273, ISL28470
April 13, 2007
FN6260.2
Micropower, Single Supply, Rail-to-Rail
Input and Output (RRIO) Instrumentation
Amplifier
The ISL28270 and ISL28273 are dual channel micropower
instrumentation amplifiers (in-amps) and the ISL28470 is a
Quad-channel in-amp optimized for low 2.4V to 5V single
supplies.
All three devices feature an Input Range Enhancement
Circuit (IREC) which maintains CMRR performance for input
voltages equal to the positive supply and down to 50mV
above the negative supply rail. The input signal is capable of
swinging above the positive supply rail and to 10mV above
the negative supply with only a slight degradation of the
CMRR performance. The output operation is rail to rail.
The ISL28273 is compensated for a minimum gain of 10 or
more. For higher gain applications, the ISL28270 and
ISL28470 are compensated for a minimum gain of 100. The
in-amps have bipolar input devices for best offset and
excellent 1/f noise performance. The amplifiers can be
operated from one lithium cell or two Ni-Cd batteries.
Ordering Information
www.DataSheet4U.com
PART NUMBER
PART
(Note)
MARKING
TAPE & PACKAGE PKG.
REEL (Pb-Free) DWG. #
ISL28270IAZ
(Note)
28270 IAZ
97/Tube 16 Ld QSOP MDP0040
(Pb-free)
ISL28270IAZ-T13 28270 IAZ
(Note)
13” 16 Ld QSOP MDP0040
(1k pcs) (Pb-free)
Coming Soon
ISL28273FAZ
(Note)
28273 FAZ
97/Tube 16 Ld QSOP MDP0040
(Pb-free)
Coming Soon
ISL28273FAZ-T7
(Note)
28273 FAZ
7” 16 Ld QSOP MDP0040
(1k pcs) (Pb-free)
ISL28470FAZ
(Note)
ISL28470FAZ 48/Tube 28 Ld QSOP M28.15
(Pb-free)
ISL28470FAZ-T7 ISL28470FAZ 7” 28 Ld QSOP M28.15
(Note)
(1k pcs) (Pb-free)
ISL28270INEVAL1Z Evaluation Platform
(Note)
ISL28273INEVAL1Z Evaluation Platform
Coming Soon
Evaluation Platform
ISL28470EVAL1Z
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
• 60µA supply current per channel ISL28270
• 150µV max offset voltage
• 2nA max input bias current ISL28270
• 110dB CMRR, PSRR
• 0.7µV/°C offset voltage temperature coefficient
• 240kHz -3dB bandwidth (G = 100) ISL28270, ISL28470
• 230kHz -3dB bandwidth (G = 10) ISL28273
• 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)
• Output sources and sinks ±29mA load current
• 0.5% gain error
• Pb-free plus anneal available (RoHS compliant)
Applications
• Battery or solar-powered systems
• Strain gauge
• Sensor signal conditioning
• Medical devices
• Industrial instrumentations
Related Literature
• AN1290, ISL2827xINEVAL1Z Evaluation Board User’s
Guide
• AN1298, Instrumentation Amplifier Application Note
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, 2007. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL28270, ISL28273, ISL28470
Electrical Specifications V+ = +5V, VM = GND, VCM = 1/2V+, TA = +25°C, unless otherwise specified. Boldface limits apply over the
operating temperature range, -40°C to +125°C. (Continued)
PARAMETER
DESCRIPTION
CONDITIONS
MIN TYP MAX UNIT
ISC Short Circuit Output Current
V+ = 5V, RLOAD = 10Ω
±20 ±29
±18
mA
V+ = 2.4V, RLOAD = 10Ω
±8 mA
Typical Performance Curves
90
COMMON-MODE INPUT = VS+
80 GAIN = 10,000V/V
GAIN = 5,000V/V
70 GAIN = 2,000V/V
GAIN = 1,000V/V
60
GAIN = 500V/V
50 GAIN = 200V/V
GAIN = 100V/V
40
30
1
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
FIGURE 1. ISL28270, ISL28470 FREQUENCY RESPONSE vs
CLOSED LOOP GAIN (V+ = VCM = 5V)
70
COMMON-MODE INPUT = V+
60
GAIN = 1000
50 GAIN = 500
GAIN = 200
40
GAIN = 100
30 GAIN = 50
GAIN = 20
20
GAIN = 10
10
1E+00 1E+01 1E+02 1E+03 1E+04 1E+05 1E+06
FREQUENCY (Hz)
FIGURE 2. ISL28273 FREQUENCY RESPONSE vs CLOSED
LOOP GAIN (VCM = V+)
90 COMMON-MODE INPUT = 1/2VS
80 GAIN = 10,000V/V
GAIN = 5,000V/V
70 GAIN = 2,000V/V
GAIN = 1,000V/V
60
GAIN = 500V/V
50 GAIN = 200V/V
GAIN = 100V/V
40
30
1 10 100 1k 10k 100k 1M
FREQUENCY (Hz)
FIGURE 3. ISL28270, ISL28470 FREQUENCY RESPONSE vs
CLOSED LOOP GAIN (V+ = 5V, VCM = 1/2V+)
70
COMMON-MODE INPUT = 1/2V+
GAIN = 1000
60
GAIN = 500
50 GAIN = 200
GAIN = 100
40
GAIN = 50
30 GAIN = 20
20 GAIN = 10
10
1E+00
1E+01
1E+02 1E+03 1E+04
FREQUENCY (Hz)
1E+05
1E+06
FIGURE 4. ISL28273 FREQUENCY RESPONSE vs CLOSED
LOOP GAIN (VCM = 1/2V+)
5 FN6260.2
April 13, 2007
5 Page 
ISL28270, ISL28273, ISL28470
Application Information
Product Description
The ISL28270 and ISL28273 are dual channel micropower
instrumentation amplifiers (in-amps) and the ISL28470 is a
Quad-channel which delivers 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 60µA per channel. Because the independent pair of
feedback terminals set the gain and adjust the output 0 level,
the ISL28270, ISL28273 and ISL28470 achieve high CMRR
regardless of the tolerance of the gain setting resistors. The
ISL28270 and ISL28470 are internally compensated for a
minimum gain of 100. The ISL28273 is internally
compensated for a minimum gain of 10.
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 ISL28270 and ISL28470 have 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 ISL28273 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
ISL28273 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 bipolar PNP 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 close to ground making
these in-amps well suited for single 5V down to 2.4V supply
systems. There is no need to bias the common-mode input to
achieve symmetrical input voltage. It is recommended,
however, that the common-mode input be biased at least 10mV
above the negative supply rail to achieve top performance. See
“Input Bias Cancellation/Compensation” on page 11.
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.
Input Bias Cancellation/Compensation
All three parts have an Input Bias Cancellation/Compensation
Circuit for both the input and feedback terminals (IN+, IN-, FB+
and FB-), achieving a low input bias current throughout the
input common-mode range and the operating temperature
range. While the PNP bipolar input stages are biased with an
adequate amount of biasing current for speed and increased
noise performance, the Input Bias Cancellation/Compensation
Circuit sinks most of the base current of the input transistors
leaving a small portion as input bias current, typically 500pA. In
addition, the Input Bias Cancellation/Compensation Circuit
maintains a smooth and flat behavior of input bias current over
the common mode range and over the operating temperature
range. The Input Bias Cancellation/Compensation Circuit
operates from input voltages of 10mV above the negative
supply to input voltages slightly above the positive supply.
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 29mA. 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.
11 FN6260.2
April 13, 2007
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet ISL28273.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ISL28270 | (ISL28270 - ISL28470) Rail-to-Rail Input and Output (RRIO) Instrumentation Amplifier | Intersil Corporation |
| ISL28271 | (ISL28271 / ISL28272) Rail-to- Rail Input and Output (RRIO) Instrumentation Amplifier | Intersil Corporation |
| 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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