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PDF EL8171 Data sheet ( Hoja de datos )

Número de pieza EL8171
Descripción (EL8171 / EL8172) Rail-to-Rail Input-Output Instrumentation Amplifiers
Fabricantes Intersil Corporation 
Logotipo Intersil Corporation Logotipo



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Data Sheet
EL8171, EL8172
October 9, 2015
FN6293.6
Micropower, Single Supply, Rail-to-Rail
Input-Output Instrumentation Amplifiers
The EL8171 and EL8172 are micropower instrumentation
amplifiers optimized for single supply operation over the
+2.4V to +5.5V range. Inputs and outputs can operate
rail-to-rail. As with all instrumentation amplifiers, a pair of
inputs provide very 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 EL8172 is compensated for a gain of 100 or more, and
the EL8171 is compensated for a gain of 10 or more. The
EL8171 and EL8172 have PMOS input devices that provide
sub-nA input bias currents.
The amplifiers can be operated from one lithium cell or two
Ni-Cd batteries. The EL8171 and EL8172 input range goes
from below ground to slightly above positive rail. The output
stage swings completely to ground (ground sensing) or
positive supply - no pull-up or pull-down resistors are
needed.
Pinout
EL8171, EL8172
(8 LD SOIC)
TOP VIEW
DNC 1
+- 8 FB+
IN- 2 +-
7 V+
IN+ 3
6 VOUT
V- 4
5 FB-
Features
• 95µA maximum supply current
• Maximum input offset voltage
- 300µV (EL8172)
- 1500µV (EL8171)
• 50pA maximum input bias current
• 450kHz -3dB bandwidth (G = 10)
• 170kHz -3dB bandwidth (G = 100)
• Single supply operation
- Input voltage range is rail-to-rail
- Output swings rail-to-rail
- Ground sensing
• Pb-free (RoHS compliant)
Applications
• Battery- or solar-powered systems
• Strain gauges
• Current monitors
• Thermocouple amplifiers
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
PACKAGE
(Pb-free)
PKG.
DWG. #
EL8171FSZ*(No 8171FSZ
longer available,
recommended
replacement:
EL8170FSZ-T7)
8 Ld SOIC MDP0027
EL8172FSZ*
8172FSZ
8 Ld SOIC MDP0027
*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.
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 LLC.
Copyright © Intersil Americas LLC. 2005-2007, 2009, 2015. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.

1 page




EL8171 pdf
EL8171, EL8172
Typical Performance Curves V+ = 5V, V- = 0V,VCM = 2.5V, RL = Open, unless otherwise specified. (Continued)
90 120
80
70 100
60
50
40
30
AV = 10
20
10
0
-10
10 100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 7. EL8171 CMRR vs FREQUENCY
1M
80
60
AV = 100
40
20
0
10 100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 8. EL8172 CMRR vs FREQUENCY
1M
120
100
80
60
40
AV = 10
20
PSRR+
PSRR-
0
10 100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 9. EL8171 PSRR vs FREQUENCY
1M
120
100
80
60
40
AV = 10
20
PSRR+
PSRR-
0
10 100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 10. EL8172 PSRR vs FREQUENCY
1M
1400
1200
1000
800
600
AV = 10
400
200
0
1 10 100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 11. EL8171 VOLTAGE NOISE SPECTRAL DENSITY
700
600
500
400
300
200 AV = 100
100
0
1 10 100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 12. EL8172 VOLTAGE NOISE SPECTRAL DENSITY
5 FN6293.6
October 9, 2015

5 Page





EL8171 arduino
EL8171, EL8172
Gain Setting
VIN, the potential difference across IN+ and IN-, is replicated
(less the input offset voltage) across FB+ and FB-. The
obsession of the EL8171 and EL8172 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 gain of the EL8171 and EL8172
is set by two external resistors, the feedback resistor RF, and
the gain resistor RG.
2.4V TO 5.5V
VIN/2
VCM
VIN/2
71
3 IN+ + V+
2 IN- -
8
FB+
EL8171/2
+
5 FB- - V-
4
6
VOUT
RG RF
FIGURE 37. CIRCUIT 1 - GAIN IS BY EXTERNAL RESISTORS
RF AND RG
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, Equation 1 is
only true for a positive swing in VIN; negative input swings
will be ignored and the output will be at ground.
Reference Connection
Unlike a three-op amp instrumentation amplifier, a finite
series resistance seen at the REF terminal does not degrade
the EL8171 and EL8172's high CMRR performance,
eliminating the need for an additional external buffer
amplifier. Circuit 2 (Figure 38) uses the FB+ pin to provide a
high impedance REF terminal.
The FB+ pin is used as a REF terminal to center or to adjust
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. See Circuit 2 (Figure 38). Note that
any noise or unwanted signals on the reference supply will
be amplified at the output according to Equation 2.
The FB+ pin can also be connected to the other end of resistor,
RG. See Circuit 3 (Figure 39). Keeping the basic concept that
the EL8171 and EL8172 in-amps maintain constant differential
voltage across the input terminals and feedback terminals (IN+
- IN- = FB+ - FB-), the transfer function of Circuit 3 can be
derived. Note that the VREF gain term is eliminated and
VIN/2
VIN/2
VCM
2.4V TO 5.5V
REF
R1
R2
RG
2.4V TO 5.5V
71
3 IN+
V+
+
2 IN- -
8 FB+ + EL8171/2
5 FB- - V-
4
6
RF
VOUT
FIGURE 38. CIRCUIT 2 - GAIN SETTING AND REFERENCE
CONNECTION
VOUT
=
1
+
R-R----G-F--
VIN
+
1
+
R-R----G-F--
VREF
(EQ. 2)
susceptibility to external noise is reduced, however the VREF
source must be capable of sourcing or sinking the feedback
current from VOUT through RF and RG.
VIN/2
VCM
VIN/2
2.4V TO 5.5V
71
3 IN+ + V+
2 IN- -
8 FB+ + EL8171/2
5 FB- - V-
4
6
VOUT
VREF
RG
RF
FIGURE 39. CIRCUIT 3 - REFERENCE CONNECTION WITH AN
AVAILABLE VREF
VOUT
=
1
+
R-R----G-F--
VIN
+
VREF
(EQ. 3)
External Resistor Mismatches
Because of the independent pair of feedback terminals
provided by the EL8171 and EL8172, the CMRR is not
degraded by any resistor mismatches. Hence, unlike a three op
amp and especially a two op amp in-amp, the EL8171 and
EL8172 reduce the cost of external components by allowing the
use of 1% or more tolerance resistors without sacrificing CMRR
performance. The EL8171 and EL8172 CMRR will be
maintained regardless of the tolerance of the resistors used.
Gain Error and Accuracy
The EL8172 has a Gain Error (EG) of 0.2% typical. The
EL8171 has an EG of 0.15% typical. The gain error indicated
in the “Electrical Specifications” table on page 2 is the inherent
gain error of the EL8171 and EL8172 and does not include
11 FN6293.6
October 9, 2015

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