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PDF EL8178 Data sheet ( Hoja de datos )
| Número de pieza | EL8178 | |
| Descripción | Micropower Single Supply Rail-to-Rail Input-Output (RRIO) Precision Op Amp | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de EL8178 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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Micropower Single Supply Rail-to-Rail
Input-Output (RRIO) Precision Op Amp
The EL8178 is a precision low power, operational amplifier.
The device is optimized for single supply operation between
2.4V to 5.5V. This enables operation from one lithium cell or
two Ni-Cd batteries. The input range includes both positive
and negative rail.
For power sensitive applications, the EL8178 has and EN
pin that will shut the device down and reduce the supply
current to 3µA typ. In the active state, the EL8178 draws
minimal supply current (55µA) while meeting excellent
DC-accuracy, noise, and output drive specifications.
Ordering Information
PART
NUMBER
(Note 1)
PART
MARKING
PACKAGE
(Pb-Free)
PKG.
DWG. #
EL8178FWZ-T7* BBWA
6 Ld SOT-23
MDP0038
EL8178FWZ-T7A* BBWA
6 Ld SOT-23
MDP0038
EL8178FSZ
8178FSZ
8 Ld SO
MDP0027
EL8178FSZ-T7* 8178FSZ
8 Ld SO
MDP0027
*Please refer to TB347 for details on reel specifications.
NOTE:
1. 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.
May 14, 2008
EL8178
FN7504.7
Features
• Typical 55µA supply current
• 250µV max offset voltage
• Typical 1pA input bias current
• 266kHz gain-bandwidth product
• Single supply operation between 2.4V to 5.5V
• Rail-to-rail input and output
• Ground sensing
• Output sources 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
Pinouts
EL8178
(6 LD SOT-23)
TOP VIEW
OUT 1
V- 2
IN+ 3
+-
6 V+
5 EN
4 IN-
EL8178
(8 LD SO)
TOP VIEW
NC 1
IN- 2
IN+ 3
V- 4
-
+
8 EN
7 V+
6 OUT
5 NC
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. 2004-2008. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
EL8178
Typical Performance Curves VS = ±2.5V, TA = +25°C, Unless Otherwise Specified (Continued)
100
90
80
70
60 90
50
40
PHASE
135
30
20
10 GAIN
180
0
-10
10
100
1k
10k 100k
1M
FREQUENCY (Hz)
FIGURE 7. OPEN LOOP GAIN AND PHASE vs FREQUENCY
(RL = 100kΩ)
10
0
-10
ΔVCM = 1VP-P
RL = 100kΩ
AV = +1
-20
-30
-40
-50
-60
-70
-80
-90
-100
10 100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 8. CMRR vs FREQUENCY
1M
10
0 ΔVS = 1VP-P
-10
-20
RL = 100kΩ
AV = +1
-30
-40 -PSRR
-50
-60 +PSRR
-70
-80
-90
-100
10 100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 9. PSRR vs FREQUENCY
1M
1000
100
100 10
VOLTAGE
10 1
CURRENT
1 0.1
1 10 100 1k 10k 100k
FREQUENCY (Hz)
FIGURE 10. INPUT VOLTAGE AND CURRENT NOISE vs
FREQUENCY
2.8µVP-P
TIME (1s/DIV)
FIGURE 11. 0.1Hz TO 10Hz INPUT VOLTAGE NOISE
5
FN7504.7
May 14, 2008
5 Page 
EL8178
Proper Layout Maximizes Precision
To achieve the optimum levels of high input impedance
(i.e., low input currents) and low offset voltage, care should
be taken in the circuit board layout. The PC board surface
must remain clean and free of moisture to avoid leakage
currents between adjacent traces. Surface coating of the
circuit board will reduce surface moisture and provide a
humidity barrier, reducing parasitic resistance on the board.
When input leakage current is a paramount concern, the use
of guard rings around the amplifier inputs will further reduce
leakage currents. Figure 28 shows a guard ring example for
a unity gain amplifier that uses the low impedance amplifier
output at the same voltage as the high impedance input to
eliminate surface leakage. The guard ring does not need to
be a specific width, but it should form a continuous loop
around both inputs. For further reduction of leakage
currents, mount components to the PC board using Teflon
standoffs..
HIGH IMPEDANCE INPUT
V+
IN
FIGURE 28. GUARD RING EXAMPLE FOR UNITY GAIN
AMPLIFIER
Typical Applications
GENERAL
PURPOSE
COMBINATION
pH PROBE
+ V+
EL8178
- V-
+
3V
COAX
FIGURE 29. pH PROBE AMPLIFIER
A general-purpose combination pH probe has extremely
high output impedance typically in the range of 10GΩ to
12GΩ. Low loss and expensive Teflon cables are often used
to connect the pH probe to the meter electronics. Figure 29
details a low-cost alternative solution using the EL8178 and
a low-cost coax cable. The EL8178 PMOS high impedance
input senses the pH probe output signal and buffers it to
drive the coax cable. Its rail-to-rail input nature also
eliminates the need for a bias resistor network required by
other amplifiers in the same application.
R3
R2
K TYPE
THERMOCOUPLE
10kΩ
10kΩ
R4
100kΩ
+ V+
EL8178
- V-
+
5V
410μV/°C
R1
100kΩ
FIGURE 30. THERMOCOUPLE AMPLIFIER
Thermocouples are the most popular temperature sensing
devices because of their low cost, interchangeability, and
ability to measure a wide range of temperatures. In
Figure 30, the EL8178 converts the differential thermocouple
voltage into single-ended signal with 10x gain. The EL8178's
rail-to-rail input characteristic allows the thermocouple to be
biased at ground and permits the op amp to operate from a
single 5V supply.
11 FN7504.7
May 14, 2008
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet EL8178.PDF ] | |
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