intersil EL8171, EL8172 DATA SHEET
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EL8171, EL8172
Data Sheet October 26, 2005
Micropower, Single Supply, Rail-to-Rail
Input-Output Instrumentation Amplifiers
The EL8171 and EL8172 are micropower instrumentation
amplifiers optimized for operation at 2.9V to 5V single
supplies. 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 or positive supply - no
pull-up or pull-down resistors are needed.
Pinout
EL8171, EL8172
(8 LD SO)
TOP VIEW
ENABLE
IN-
IN+
1
2
+
3
+
8
FB+
-
-
7
Σ
VS+
OUT
6
FN6293.0
Features
• 78µA maximum supply current
• Maximum input offset voltage
- 300µV (EL8172)
- 1000µV (EL8171)
• 200pA maximum input bias current
• 3µV/°C offset voltage drift
• 450kHz -3dB bandwidth (G = 10)
• 170kHz -3dB bandwidth (G = 100)
• 0.5V/µs slew rate
• Single supply operation
- Input voltage range is rail-to-rail
- Output swings rail-to-rail
• Output sources and sinks ±29mA load current
• 0.2% gain accuracy
• Pb-free plus anneal available (RoHS compliant)
Applications
• Battery- or solar-powered systems
• Strain gauges
• Current monitors
• Thermocouple amplifiers
VS-
4
1
5
FB-
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.
All other trademarks mentioned are the property of their respective owners.
Copyright © Intersil Americas Inc. 2005. All Rights Reserved.
Ordering Information
EL8171, EL8172
PAR T
PART NUMBER
EL8171IS 8171IS - 8 Ld SO MDP0027 EL8172IS 8172IS - 8 Ld SO MDP0027
EL8171IS-T7 8171IS 7” 8 Ld SO MDP0027 EL8172IS-T7 8172IS 7” 8 Ld SO MDP0027
EL8171IS-T13 8171IS 13” 8 Ld SO MDP0027 EL8172IS-T13 8172IS 13” 8 Ld SO MDP0027
EL8171ISZ
(See Note)
EL8171ISZ-T7
(See Note)
EL8171ISZ-T13
(See Note)
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.
MARKING
8171ISZ - 8 Ld SO
8171ISZ 7” 8 Ld SO
8171ISZ 13” 8 Ld SO
TAPE &
REEL PACKAGE
(Pb-free)
(Pb-free)
(Pb-free)
PKG.
DWG. # PART NUMBER
MDP0027 EL8172ISZ
(See Note)
MDP0027 EL8172ISZ-T7
(See Note)
MDP0027 EL8172ISZ-T13
(See Note)
PAR T
MARKING
8172ISZ - 8 Ld SO
8172ISZ 7” 8 Ld SO
8172ISZ 13” 8 Ld SO
TAPE &
REEL PACKAGE
(Pb-free)
(Pb-free)
(Pb-free)
PKG.
DWG. #
MDP0027
MDP0027
MDP0027
Pin Description
EL8171/EL8172 PIN NAME PIN FUNCTION
1 ENABLE
2 IN- Inverting (IN-) and non-inverting (IN+) high impedance input terminals. The input terminals are equivalent to
3IN+
5 FB- High impedance feedback terminals. The feedback terminals have a very similar equivalent circuit as the
8FB+
7 VS+ Positive supply terminal.
4 VS- Negative supply terminal.
6 VOUT Output Voltage.
Active Low. When pulled up above 2V, the in-amp conserves 3µA disabled supply current and the output is
in a high impedance state. An internal pull down defines the ENABLE
the gate of PMOS transistor.
input terminals. The negative feedback (FB-) pin connects to an external resistive network to set the gain of
the in-amp. The positive feedback (FB+) pin can be used to shift the DC level of the output or as an output
offset.
low when left floating.
2
FN6293.0
October 26, 2005
EL8171, EL8172
Absolute Maximum Ratings (T
Supply Voltage, V
Differential Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.5V to VS+ + 0.5V
EN
ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3kV
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: TJ = TC = T
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V
S
Electrical Specifications V
= 25°C)
A
Output Short-Circuit Duration . . . . . . . . . . . . . . . . . . . . . . .Indefinite
Ambient Operating Temperature . . . . . . . . . . . . . . . . -40°C to +85°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
A
+ = +5V, VS- = GND, VCM = 1/2VS+ TA = 25°C, unless otherwise specified.
S
PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT
V
OS
Input Offset Voltage EL8171 400 1000 µV
EL8172 150 300 µV
TCV
OS
Input Offset Voltage Temperature
Temperature = -40°C to 85°C 3 µV/°C
Coefficient
I
OS
I
B
e
N
Input Offset Current 10 200 pA
Input Bias Current 10 200 pA
Input Noise Voltage EL8171 f = 0.1Hz to 10Hz 10 µV
EL8172 4 µV
P-P
P-P
Input Noise Voltage Density fo = 1kHz 50 nV/√Hz
R
IN
V
IN
CMRR Common Mode Rejection Ratio EL8172, V
Input Resistance 25 GΩ
Input Voltage Range Guaranteed by CMRR test 0 5 V
= 0V to +5V 80 108 dB
CM
EL8171, V
= 0V to +5V 80 104 dB
CM
PSRR Power Supply Rejection Ratio EL8172, VS = 2.4V to 5V 80 104 dB
E
V
G
OUT
EL8171, V
Gain Error EL8172, RL = 100kΩ to 2.5V -1.5 +0.3 +1.5 %
EL8171, R
Maximum Voltage Swing Output low, 100kΩ to 2.5V 0 4 10 mV
= 2.4V to 5V 70 90 dB
S
= 100kΩ to 2.5V -0.8 +0.2 +0.8 %
L
Output low, 1kΩ to 2.5V 0.13 0.25 V
Output high, 100kΩ to 2.5V 4.990 4.996 V
Output high, 1kΩ to GND 4.75 4.88 V
SR Slew Rate R
= 1kΩ to GND 0.3 0.5 0.7 V/µs
L
-3dB BW -3dB Bandwidth EL8171 Gain = 10V/V 450 kHz
Gain = 20 210 kHz
Gain = 50 66 kHz
Gain = 100 33 kHz
EL8172 Gain = 100 172 kHz
Gain = 200 70 kHz
Gain = 500 25 kHz
Gain = 1000 12 kHz
I
S,EN
Supply Current, Enabled 40 60 78 µA
3
FN6293.0
October 26, 2005
EL8171, EL8172
Electrical Specifications V
+ = +5V, VS- = GND, VCM = 1/2VS+ TA = 25°C, unless otherwise specified. (Continued)
S
PARAMETER DESCRIPTION CONDITIONS MIN TYP MAX UNIT
I
S,DIS
V
ENH
V
ENL
V
S
I
O
Supply Current, Disabled EN = VS+1.52.95µA
Enable Pin for Shut-down 2 V
Enable Pin for Power-on 0.8 V
Minimum Supply Voltage 2.2 2.4 V
Output Current into 10Ω to VS/2 VS = 5V ±18 ±29 mA
V
= 2.9V ±4 ±7.5 mA
S
Typical Performance Curves
40
30
20
GAIN (dB)
10
0
1 10 100 1K 10K 100K 1M
G=100
G=50
G=20
G=10
G=5
Vs=5V
FREQUENCY (Hz)
FIGURE 1. EL8171 FREQUENCY RESPONSE vs CLOSED
LOOP GAIN
70
60
50
GAIN (dB)
40
30
20
FIGURE 2. EL8172 FREQUENCY RESPONSE vs CLOSED
G=2000
G=1000
G=500
G=200
G=100
G=50
Vs=5V
1 10 100 1K 10K 100K 1M
FREQUENCY (Hz)
LOOP GAIN
25
VS=±2.5V
20
15
10
GAIN (dB)
AV=10
=10kΩ
R
L
CL=10pF
5
0
100 10k1k 100k
=9.08Ω
R
F/RG
RF=178kΩ
RG=19.6kΩ
VS=±1.25V
VS=±1V
1M
FREQUENCY (Hz)
FIGURE 3. EL8171 FREQUENCY RESPONSE vs SUPPLY
VO LTAGE
4
45
40
35
30
25
20
AV=100
15
=10kΩ
R
MAGNITUDE (dB)
L
CL=10pF
10
5
0
100 10k1k 100k
=99.02Ω
R
F/RG
RF=221kΩ
RG=2.23kΩ
FREQUENCY (Hz)
VS=±1.25V
VS=±2.5V
VS=±1V
1M
FIGURE 4. EL8172 FREQUENCY RESPONSE vs SUPPLY
VOLTAGE
FN6293.0
October 26, 2005
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