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EL8176 Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer EL8176
Beschreibung Micropower Single Supply Rail-to-Rail Input-Output Precision Op Amp
Hersteller Intersil Corporation
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Gesamt 16 Seiten
EL8176 Datasheet, Funktion
DATASHEET
Micropower Single Supply Rail-to-Rail Input/Output
Precision Op Amp
EL8176
The EL8176 is a precision low power, operational amplifier.
The device is optimized for single supply operation between
2.4V to 5.5V.
The EL8176 draws minimal supply current while meeting
excellent DC-accuracy noise and output drive specifications.
Competing devices seriously degrade these parameters to
achieve micropower supply current.
The EL8176 can be operated from one lithium cell or two Ni-Cd
batteries. The input range includes both positive and negative
rail. The output swings to both rails.
Features
• 55µA supply current
• 100µV max offset voltage (8 Ld SO)
• 2nA input bias current
• 400kHz gain-bandwidth product
• Single supply operation down to 2.4V
• Rail-to-rail input and output
• Output sources 31mA and sinks 26mA load current
• Pb-free (RoHS compliant)
Applications
• Battery- or solar-powered systems
• 4mA to 20mA current loops
• Handheld consumer products
• Medical devices
• Thermocouple amplifiers
• Photodiode pre amps
• pH probe amplifiers
Pin Configurations
EL8176
(6 LD SOT-23)
TOP VIEW
OUT 1
6 V+
V- 2 + - 5 EN
IN+ 3
4 IN-
EL8176
(8 LD SO)
TOP VIEW
NC 1
IN- 2
IN+ 3
V- 4
-
+
8 EN
7 V+
6 OUT
5 NC
January 6, 2015
FN7436.9
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2004-2006, 2008, 2009, 2015. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.






EL8176 Datasheet, Funktion
EL8176
Typical Performance Curves (Continued)
3
2
1 RL = 10k
0
-1
-2 RL = 100k
-3
-4 V+ = 5V
-5 CL = 8.3pF
-6 AV = +1
-7 VOUT = 10mVP-P
RL = 1k
-8
10 100 1k 10k 100k
FREQUENCY (Hz)
1M
10M
FIGURE 7. GAIN vs FREQUENCY vs RL
70
AV = 1001
60
AV = 1001, Rg = 1k, Rf = 1M
50
AV = 101
40
AV = 101, Rg = 1k, Rf = 100k
30
20 AV = 10
V+ = 5V
CL = 8.3pF
RL = 10k
VOUT = 10mVP-P
10 AV = 10, Rg = 1k, Rf = 9.09k
0 AV = 1
-10
10
AV = 1, Rg = INF, Rf = 0
100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
FIGURE 8. FREQUENCY RESPONSE vs CLOSED LOOP GAIN
2
1 V+ = 2.5V
0
-1
-2
-3 V+ = 5V
-4
-5 RL = 10k
-6 CL = 8.3pF
-7 AV = +1
-8 VOUT = 10mVP-P
-91k
10k
V+ = 2V
100k
1M
10M
FREQUENCY (Hz)
FIGURE 9. GAIN vs FREQUENCY vs SUPPLY VOLTAGE
45
40
35 RL = 10k
CL = 8.3pF
30 AV = 100
VOUT = 10mVP-P
25 Rf = 221kΩ
Rg = 2.23kΩ
20
V+ = 2.5V
V+ = 5V
15
10 V+ = 2V
5
0
100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 10. GAIN vs FREQUENCY vs SUPPLY VOLTAGE
1M
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
V+ = 5V
RL = 10k
AV = +1
-8 VOUT = 10mVP-P
-9
1k
10k
CL = 64.3pF
CL = 47.3pF
CL = 35.3pF
CL = 26.3pF
CL = 8.3pF
100k
1M
FREQUENCY (Hz)
FIGURE 11. GAIN vs FREQUENCY vs CL
10M
20
0
-20
-40
-60
-80
-100
V+ = 5V
RL = OPEN
CL = 8.3pF
AV = +1
VCM = 1VP-P
-120
1
10 100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 12. CMRR vs FREQUENCY; V+, V- = ±2.5V
1M
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EL8176 pdf, datenblatt
EL8176
Typical Performance Curves (Continued)
0.23
0.21
n = 12
0.19
0.17
0.15
MAX
MEDIAN
0.13
0.11
MIN
0.09
-40
-20
0
20 40 60 80 100
TEMPERATURE (°C)
FIGURE 43. ±SLEW RATE vs TEMPERATURE VS = ±2.5V
INPUT = ±0.75V, AV = 2
120
0.17
0.16
0.15
n = 12
MAX
0.14
MEDIAN
0.13
0.12
MIN
0.11
0.10
-40 -20
0
20 40 60 80 100
TEMPERATURE (°C)
FIGURE 44. ±SLEW RATE vs TEMPERATURE VS = ±2.5V
INPUT = ±0.75V, AV = 2
120
900
n = 12
800
700
MAX
600 MEDIAN
500
400 MIN
300
200
100
0
-40 -20
0
20 40 60 80 100
TEMPERATURE (°C)
FIGURE 45. AVOL, RL = 100k, VS ±2.5V, VO = ±2V
120
Applications Information
Introduction
The EL8176 is a rail-to-rail input and output micro-power
precision single supply operational amplifier with an enable
feature. The device achieves rail-to-rail input and output
operation and eliminates the concerns introduced by a
conventional rail-to-rail I/O operational amplifier as discussed
below.
Rail-to-Rail Input
The input common-mode voltage range of the EL8176 goes from
negative supply to positive supply without introducing offset errors
or degrading performance associated with a conventional
rail-to-rail input operational amplifier. Many rail-to-rail input stages
use two differential input pairs, a long-tail PNP (or PFET) and an
NPN (or NFET). Severe penalties have to be paid for this circuit
topology. As the input signal moves from one supply rail to
another, the operational amplifier switches from one input pair to
the other causing drastic changes in input offset voltage and an
undesired change in magnitude and polarity of input offset
current.
The EL8176 achieves input rail-to-rail without sacrificing
important precision specifications and without degrading
distortion performance. The EL8176's input offset voltage
exhibits a smooth behavior throughout the entire common-mode
input range. The input bias current versus the common-mode
voltage range for the EL8176 gives us an undistorted behavior
from typically 10mV above the negative rail all the way up to the
positive rail.
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