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EL8178
Data Sheet October 5, 2005 FN7504.2
PRELIMINARY
Micropower Single Supply Rail-to-Rail Input-Output Precision Op Amp
The EL8178 is a micropower precision operational amplifier optimized for single supply operation at 5V and can operate down to 2.4V. The EL8178 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. Offset current, voltage and current noise, slew rate, and gain-bandwidth product are all two to ten times better than on previous micropower op amps. The EL8178 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
* 50A supply current * 100V max offset voltage * 1pA input bias current * 250kHz gain-bandwidth product * 0.13V/s slew rate * Single supply operation down to 2.4V * Rail-to-rail input and output * Output sources and sinks 26mA load current * Pb-Free plus anneal available (RoHS compliant)
Applications
* Battery- or solar-powered systems * 4mA to 20mA current loops
Ordering Information
PART NUMBER EL8178AIW-T7 EL8178AIW-T7A EL8178AIWZ-T7 (Note) PART MARKING BBHA BBHA BBPA TAPE & REEL 7" (3K pcs) PACKAGE PKG. DWG. #
* Handheld consumer products * Medical devices * Thermocouple amplifiers * Photodiode pre amps * pH probe amplifiers
6 Ld SOT-23 MDP0038
7"| 6 Ld SOT-23 MDP0038 (250 pcs) 7" (3K pcs) 6 Ld SOT-23 MDP0038 (Pb-free)
Pinouts
EL8178 (6 LD SOT-23) TOP VIEW
OUT 1 VS- 2 IN+ 3 +6 VS+ 5 ENABLE 4 IN-
EL8178AIWZ-T7A BBPA (Note) EL8178BIW-T7 EL8178BIW-T7A EL8178BIWZ-T7 (Note) BBHA BBHA BBPA
7" 6 Ld SOT-23 MDP0038 (250 pcs) (Pb-free) 7" (3K pcs) 6 Ld SOT-23 MDP0038
7" 6 Ld SOT-23 MDP0038 (250 pcs) 7" (3K pcs) 6 Ld SOT-23 MDP0038 (Pb-free)
EL8178BIWZ-T7A BBPA (Note) EL8178ISZ (Note) EL8178ISZ-T7 (Note) EL8178ISZ-T13 (Note) 8178ISZ 8178ISZ 8178ISZ
7" 6 Ld SOT-23 MDP0038 (250 pcs) (Pb-free) 7" 13" 8 Ld SO (Pb-free) 8 Ld SO (Pb-free) 8 Ld SO (Pb-free) MDP0027 MDP0027
NC 1
EL8178 (8 LD SO) TOP VIEW
8 ENABLE + 7 VS+ 6 VOUT 5 NC
MDP0027
IN- 2 IN+ 3 VS- 4
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.
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 (c) Intersil Americas Inc. 2004, 2005. All Rights Reserved. All other trademarks mentioned are the property of their respective owners.
EL8178
Absolute Maximum Ratings (TA = 25C)
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V Current into IN+, IN-, or ENABLE. . . . . . . . . . . . . . . . . . . . . . . . 5mA Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to VS + 0.5V Output Short-Circuit Duration . . . . . . . . . . . . . . . . . . . . . . .Indefinite Ambient Operating Temperature Range . . . . . . . . . .-40C to +85C Storage Temperature Range . . . . . . . . . . . . . . . . . .-65C to +150C
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 = TA
Electrical Specifications
PARAMETER VOS
VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25C unless otherwise specified. CONDITIONS Grade A Grade B MIN TYP 50 110 TBD EL8178IW EL8178IS 1.9 1.1 1 fO = 1kHz Guaranteed by CMRR test 0 0 VCM = 0V to 5V VS = 3.3V to 5V VO = 0.5V to 4.5V, RL = 100k VO = 0.5V to 4.5V, RL = 1k 80 80 100 100 100 400 15 3 130 4.994 4.8 0.09 fO = 100kHz 40 4.997 4.88 0.13 400 50 3 RL = 10 RL = 10 18 17 31 26 2.2 2.4 2 0.8 VEN = 5V VEN = 0V 0.25 -0.5 0.7 0 2 +0.5 75 10 0.17 6 200 35 5 5 50 MAX 100 400 UNIT V V V/Mo V/C V/C pA nV/Hz V V dB dB V/mV V/mV mV mV V V V/s kHz A A mA mA V V V A A
DESCRIPTION Input Offset Voltage
V OS -----------------Time V OS --------------T IB eN CMIR CMRR CMRR PSRR AVOL
Long Term Input Offset Voltage Stability Input Offset Drift vs Temperature
Input Bias Current Input Noise Voltage Density Input Voltage Range Input Voltage Range Common-Mode Rejection Ratio Power Supply Rejection Ratio Large Signal Voltage Gain
VOUT
Maximum Output Voltage Swing
Output low, RL = 100k Output low, RL = 1k Output high, RL = 100k Output high, RL = 1k
SR GBW IS,ON IS,OFF IO+ IOVS VINH VINL IENH IENL
Slew Rate Gain Bandwidth Product Supply Current, Enabled Supply Current, Disabled Short Circuit Output Current Short Circuit Output Current Minimum Supply Voltage Enable Pin High Level Enable Pin Low Level Enable Pin Input Current Enable Pin Input Current
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FN7504.2 October 5, 2005
EL8178 Typical Performance Curves
1 80 70 0 GAIN (dB) VS = 1.25 -1 VS = 2.5V -2 VS = 1.0V -3 1K 10K 100K 1M 60 50 40 30 20 10 0 -10 -20 1 Gain = 1V/V 10 100 1K 10K 100K 1M 10M Gain = 10 Gain = 5 Gain = 2 Gain = 1K Gain = 500 Gain = 200 Gain = 100
MAGNITUDE (dB)
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 1. UNITY GAIN FREQUENCY RESPONSE vs SUPPLY VOLTAGE
FIGURE 2. FREQUENCY RESPONSE vs CLOSED LOOP GAIN
60 50 40 30 20 10 0 INPUT OFFSET VOLTAGE (V)
200
AV = -1 VCM = VDD/2
SUPPLY CURRENT (A)
100
0
-100
2
2.5
3
3.5
4
4.5
5
5.5
-200 -0.5
0.5
1.5
2.5
3.5
4.5
5.5
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE (V)
FIGURE 3. SUPPLY CURRENT vs SUPPLY VOLTAGE
FIGURE 4. INPUT OFFSET VOLTAGE vs OUTPUT VOLTAGE
INPUT BIAS, OFFSET CURRENT (fA)
250 INPUT OFFSET VOLTAGE (V)
20 IOS IB0
150
10
50
-50
-150
-10
IB+
-250 -0.5
0.5
1.5
2.5
3.5
4.5
5.5
-20 -0.5
0.5
1.5
2.5
3.5
4.5
5.5
COMMON-MODE INPUT VOLTAGE (V)
COMMON-MODE INPUT VOLTAGE (V)
FIGURE 5. INPUT OFFSET VOLTAGE vs COMMON-MODE INPUT VOLTAGE
FIGURE 6. INPUT BIAS, OFFSET CURRENT vs COMMONMODE INPUT VOLTAGE
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FN7504.2 October 5, 2005
EL8178 Typical Performance Curves
100 80 PHASE 60 GAIN (dB) 40 0 20 0 -20 10 GAIN -50 -100 100 1K 10K 100K -150 1M
(Continued)
200 150 100 PHASE () GAIN (dB) 50
110 100 90 80 70 60 50 40 30 20 10 0 -10 -20 -30 -40
100 80 60 PHASE 40 20 GAIN 0 -20 -40 10M PHASE ()
1
10
100
1K
10K
100K
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 7. AVOL vs FREQUENCY @ 1k LOAD
FIGURE 8. OPEN LOOP GAIN AND PHASE vs FREQUENCY @ 100k
120 100 80 60 40 20 0 1
POWER SUPPLY REJECTION RATIO (dB)
10
100
1K
10K
100K
1M
120 110 100 90 80 70 60 50 40 30 20 10 0 -10 -20
PSRR+
CMRR (dB)
PSRR-
1
10
100
1K
10K
100K
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 9. CMRR vs FREQUENCY
FIGURE 10. PSRR vs FREQUENCY
1000 INPUT OFFSET VOLTAGE (V)
150 10 SAMPLES 100 50 0 -50 -100 -150 0
VOLTAGE NOISE (nV/Hz)
100
10
1 1 10 100 1K 10K 100K FREQUENCY (Hz)
10
20
30
40
50
60
70
80
90
100
TEMPERATURE (C)
FIGURE 11. VOLTAGE NOISE
FIGURE 12. VOS vs TEMPERATURE
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FN7504.2 October 5, 2005
EL8178 Typical Performance Curves
(Continued)
400 300 200 VOS (V) VOS (V) 100 0 -100 -200 -300 -400 -60 -40 -20 0 20 40 35 SOIC SAMPLES TYPICAL = 1.1V/C 60 80 100 120
800 600 400 200 0 -200 -400 -600 -800 -60 -40 -20 0 20 40 60 80 100 120 35 6-PIN SOT23 SAMPLES TYPICAL = 1.9V/C
TEMPERATURE (C)
TEMPERATURE (C)
FIGURE 13. EL8178 SOIC VOS vs TEMPERATURE (VS = 5V)
FIGURE 14. EL8178 SOT VOS vs TEMPERATURE (VS = 5V)
1 POWER DISSIPATION (W)
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 909mW
J 8 /W S O 0 C 1 =1
A
0.7 POWER DISSIPATION (W)
JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD
0.8
0.6 625mW
J
0.5 0.4 391mW 0.3 0.2 0.1 0 0
8 /W SO 0C 6 =1
A
0.6 435mW 0.4
0.2
SO T2 J 3-6 A =2 30 C /W
JA =
SO 25
T2 3- 6 6 C/ W
0
0
25
50
75 85 100
125
150
25
50
75 85 100
125
150
AMBIENT TEMPERATURE (C)
AMBIENT TEMPERATURE (C)
FIGURE 15. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
FIGURE 16. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
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FN7504.2 October 5, 2005
EL8178 Applications Information
Introduction
The EL8178 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.
GENERAL PURPOSE COMBINATION pH PROBE
Typical Applications
V+ + EL8178 V-
+ 3V
COAX
Rail-to-Rail Input
The PFET input stage of the EL8178 has an input commonmode voltage range that 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 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 EL8178 achieves input rail-to-rail performance without sacrificing important precision specifications and without degrading distortion performance. The EL8178's input offset voltage exhibits a smooth behavior throughout the entire common-mode input range.
FIGURE 17. PH PROBE AMPLIFIER
A general-purpose combination pH probe has extremely high output impedance typically in the range of 10G to 12G. Low loss and expensive Teflon cables are often used to connect the PH probe to the meter electronics. The above circuit provides 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.
R4 100k R3 R2 K TYPE THERMOCOUPLE 10k 10k V+ + EL8178 V-
+ 5V
410V/C
Rail-to-Rail Output
A pair of complementary MOSFET devices achieves rail-torail output swing. The NMOS sinks current to swing the output in the negative direction. The PMOS sources current to swing the output in the positive direction. The EL8178 with a 100k load will swing to within 3mV of the supply rails.
R1 100k
FIGURE 18. THERMOCOUPLE AMPLIFIER
Enable/Disable Feature
The EL8178 offers an EN pin. The active low enable pin disables the device when pulled up to at least 2.2V. Upon disable the part consumes typically 3A, while the output is in a high impedance state. The EN also has an internal pull down. If left open, the EN pin will pull to negative rail and the device will be enabled by default. The high impedance at output during disable allows multiple EL8178s to be connected together as a MUX. The outputs are tied together in parallel and a channel can be selected by the EN pin.
Thermocouples are the most popular temperature-sensing device because of their low cost, interchangeability, and ability to measure a wide range of temperatures. The EL8178 is used to convert 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 the converter to run from a single 5V supply.
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FN7504.2 October 5, 2005
EL8178 SO Package Outline Drawing
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FN7504.2 October 5, 2005
EL8178 SOT-23 Package Outline Drawing
NOTE: The package drawing shown here may not be the latest version. To check the latest revision, please refer to the Intersil website at http://www.intersil.com/design/packages/index.asp
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com 8
FN7504.2 October 5, 2005

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