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EL8171 Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer EL8171
Beschreibung (EL8171 / EL8172) Rail-to-Rail Input-Output Instrumentation Amplifiers
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 14 Seiten
EL8171 Datasheet, Funktion
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.






EL8171 Datasheet, Funktion
EL8171, EL8172
Typical Performance Curves V+ = 5V, V- = 0V,VCM = 2.5V, RL = Open, unless otherwise specified. (Continued)
6
5
4
3
2
AV = 10
1
0
1 10 100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 13. EL8171 CURRENT NOISE SPECTRAL DENSITY
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
1
AV = 100
10 100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 14. EL8172 CURRENT NOISE SPECTRAL DENSITY
TIME (1s/DIV)
FIGURE 15. EL8171 0.1Hz TO 10Hz INPUT VOLTAGE NOISE
(GAIN = 10)
TIME (1s/DIV)
FIGURE 16. EL8172 0.1Hz TO 10Hz INPUT VOLTAGE NOISE
(GAIN = 100)
80
N = 1000
75
70
MAX
65 MEDIAN
60
55 MIN
50
45
40-40 -20
0 20 40 60 80 100 120
TEMPERATURE (°C)
FIGURE 17. EL8171 SUPPLY CURRENT vs TEMPERATURE,
V+, V- = ±2.5V, VIN = 0V
6
90
85
80
75
70
65
60
55
50
45
40-40
N = 1500
-20 0
MAX
MEDIAN
MIN
20 40 60 80
TEMPERATURE (°C)
100 120
FIGURE 18. EL8172 SUPPLY CURRENT vs TEMPERATURE,
V+, V- = ±2.5V, VIN = 0V
FN6293.6
October 9, 2015

6 Page









EL8171 pdf, datenblatt
EL8171, EL8172
the gain error contributed by the resistors. There is an
additional gain error due to the tolerance of the resistors used.
The resulting non-ideal transfer function effectively becomes:
VOUT
=
1
+
R-R----G-F--
 1 ERG + ERF + EG  VIN
(EQ. 4)
Where:
ERG = Tolerance of RG
ERF = Tolerance of RF
EG = Gain Error of the EL8171 or EL8172
The term [1-(ERG +ERF +EG)] is the deviation from the
theoretical gain. Thus, (ERG +ERF +EG) is the total gain
error. For example, if 1% resistors are used for the EL8171,
the total gain error would be:
= ERG + ERF + EGtypical
= 0.01 + 0.01 + 0.003
(EQ. 5)
= 2.3%
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 (TJMAX) for all applications
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 6:
TJMAX = TMAX + JAxPDMAXTOTAL
(EQ. 6)
where:
• PDMAXTOTAL is the sum of the maximum power
dissipation of each amplifier in the package (PDMAX)
• PDMAX for each amplifier can be calculated as shown in
Equation 7:
PDMAX = 2*VS ISMAX + VS - VOUTMAX   V-----O----U--R--T---L-M-----A----X--(EQ. 7)
where:
• TMAX = Maximum ambient temperature
JA = Thermal resistance of the package
• PDMAX = Maximum power dissipation of 1 amplifier
• VS = Supply voltage (Magnitude of V+ and V-)
• IMAX = Maximum supply current of 1 amplifier
• VOUTMAX = Maximum output voltage swing of the
application
• RL = Load resistance
12 FN6293.6
October 9, 2015

12 Page





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