EL8188 ® Data Sheet PRELIMINARY August 25, 2005 Micropower Single Supply Rail-to-Rail Input-Output Op Amp The EL8188 is a micropower operational amplifier optimized for single supply operation at 5V and can operate down to 2.4V. The EL8188 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 EL8188 can be operated from one lithium cell or two NiCd batteries. The input range includes both positive and negative rail. The output swings to both rails. Ordering Information PART NUMBER (BRAND) FN7467.1 Features • 50µA supply current • 1mV typical offset voltage • 0.5 NA input bias current • 250kHz gain-bandwidth product • 0.13V/µs 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 25mA current loops PACKAGE TAPE & REEL PKG. DWG. # EL8188IW-T7 (BBKA) 6-Pin SOT-23 7” (3K pcs) MDP0038 EL8188IW-T7A (BBKA) 6-Pin SOT-23 7” (250 pcs) MDP0038 EL8188ISZ (See Note) 8-Pin SO (Pb-free) - MDP0027 EL8188ISZ-T7 (See Note) 8-Pin SO (Pb-free) 7” MDP0027 EL8188ISZ-T13 (See Note) 8-Pin SO (Pb-free) 13” MDP0027 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. • Handheld consumer products • Medical devices • Thermocouple amplifiers • Photodiode pre amps • pH probe amplifiers • Pressure sensor pre amp Pinouts EL8188 (6-PIN SOT-23) TOP VIEW OUT 1 VS- 2 6 VS+ + - IN+ 3 5 ENABLE 4 IN- EL8188 (8-PIN SO) TOP VIEW NC 1 IN- 2 IN+ 3 VS- 4 1 8 ENABLE + 7 VS+ 6 VOUT 5 NC 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, 2005. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. EL8188 Absolute Maximum Ratings (TA = 25°C) Output Short-Circuit Duration . . . . . . . . . . . . . . . . . . . . . . .Indefinite Ambient Operating Temperature Range . . . . . . . . . .-40°C to +85°C Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V Differential Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to VS + 0.5V ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2kV 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 VS = 5V, 0V, VCM = 0.1V, VO = 1.4V, TA = 25°C unless otherwise specified. DESCRIPTION CONDITIONS MIN TYP MAX UNIT 1 4 mV VOS Input Offset Voltage ∆V OS --------------∆T Input Offset Drift vs Temperature IB Input Bias Current eN Input Noise Voltage Density fO = 1kHz CMIR Input Voltage Range Guaranteed by CMRR test 0 CMRR Common-Mode Rejection Ratio VCM = 0V to 5V 80 100 dB PSRR Power Supply Rejection Ratio VS = 3.3V to 5V 80 100 dB AVOL Large Signal Voltage Gain VO = 0.5V to 4.5V, RL = 100kΩ 100 400 V/mV VO = 0.5V to 4.5V, RL = 1kΩ 15 V/mV Output low, RL = 100kΩ 3 6 mV 130 200 mV VOUT Maximum Output Voltage Swing EL8188IW 1.9 µV/°C EL8188IS 1.1 µV/°C 0.5 Output high, RL = 1kΩ NA 35 Output low, RL = 1kΩ Output high, RL = 100kΩ 1 nV/√Hz 5 V 4.994 4.997 V 4.8 4.88 V 0.09 0.13 SR Slew Rate GBW Gain Bandwidth Product IS,ON Supply Current, Enabled IS,OFF Supply Current, Disabled IO+ Short Circuit Output Current RL = 10Ω 18 31 mA IO- Short Circuit Output Current RL = 10Ω 17 26 mA VS Minimum Supply Voltage VINH Enable Pin High Level VINL Enable Pin Low Level IENH Enable Pin Input Current VEN = 5V 0.25 0.7 2 µA IENL Enable Pin Input Current VEN = 0V -0.5 0 +0.5 µA 2 fO = 100kHz 0.17 250 40 V/µs kHz 50 75 µA 3 10 µA 2.2 2.4 V 2 V 0.8 V FN7467.1 August 25, 2005 EL8188 Typical Performance Curves 1 80 Gain = 1K Gain = 500 60 0 50 VS = ±1.25 GAIN (dB) MAGNITUDE (dB) 70 -1 VS = ±2.5V GAIN = 200 40 GAIN = 100 GAIN = 10 30 GAIN = 5 20 10 -2 GAIN = 2 0 VS = ±1.0V -3 1K 10K -10 100K -20 1M GAIN =1 V/V 1 10 100 FREQUENCY (Hz) FIGURE 1. UNITY GAIN FREQUENCY RESPONSE vs SUPPLY VOLTAGE 200 INPUT OFFSET VOLTAGE (µV) SUPPLY CURRENT (µA) 50 40 30 20 10 2 2.5 3 4 3.5 4.5 5 0 -100 0.5 50 -50 -150 3.5 4.5 5.5 COMMON-MODE INPUT VOLTAGE (V) FIGURE 5. INPUT OFFSET VOLTAGE vs COMMON-MODE INPUT VOLTAGE 3 2.5 3.5 4.5 5.5 FIGURE 4. INPUT OFFSET VOLTAGE vs OUTPUT VOLTAGE INPUT BIAS, OFFSET CURRENT (fA) INPUT OFFSET VOLTAGE (µV) 150 2.5 1.5 OUTPUT VOLTAGE (V) 250 1.5 10M 100 -200 -0.5 5.5 FIGURE 3. SUPPLY CURRENT vs SUPPLY VOLTAGE 0.5 100K 1M AV = -1 VCM = VDD/2 SUPPLY VOLTAGE (V) -250 -0.5 10K FIGURE 2. FREQUENCY RESPONSE vs CLOSED LOOP GAIN 60 0 1K FREQUENCY (Hz) 20 IOS 10 IB0 -10 -20 -0.5 IB+ 0.5 1.5 2.5 3.5 4.5 5.5 COMMON-MODE INPUT VOLTAGE (V) FIGURE 6. INPUT BIAS, OFFSET CURRENT vs COMMONMODE INPUT VOLTAGE FN7467.1 August 25, 2005 EL8188 Typical Performance Curves (Continued) 80 60 40 PHASE 20 GAIN (dB) GAIN 0 -20 10 100 1K 10K 100K 1M -40 10M 110 100 90 80 70 60 50 40 30 20 10 0 -10 -20 -30 -40 100 80 60 PHASE 40 20 GAIN 1 10 100 CMRR (dB) 100 80 60 40 20 1K 10K 100K 1M 120 110 100 90 80 70 60 50 40 30 20 10 0 -10 -20 100K 1M -40 10M PSRR+ PSRR- 1 10 100 FREQUENCY (Hz) 1K 10K 100K 1M FREQUENCY (Hz) FIGURE 9. CMRR vs FREQUENCY FIGURE 10. PSRR vs FREQUENCY 800 1000 600 35 6-PIN SOT23 SAMPLES TYPICAL = 1.9µV/C 400 100 VOS (µV) VOLTAGE NOISE (nV/√Hz) 10K FIGURE 8. OPEN LOOP GAIN AND PHASE vs FREQUENCY @ 100kΩ POWER SUPPLY REJECTION RATIO (dB) 120 100 1K FREQUENCY (Hz) FIGURE 7. OPEN LOOP GAIN vs FREQUENCY @ 1kΩ 10 0 -20 FREQUENCY (Hz) 0 1 PHASE (°) 100 PHASE (°) GAIN (dB) 110 100 90 80 70 60 50 40 30 20 10 0 -10 -20 -30 -40 1 10 200 0 -200 -400 -600 1 1 10 100 1K 10K FREQUENCY (Hz) FIGURE 11. VOLTAGE NOISE 4 100K -800 -60 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (°C) FIGURE 12. SOT VOS vs TEMPERATURE (VS = 5V) FN7467.1 August 25, 2005 EL8188 Typical Performance Curves (Continued) 300 1 35 SOIC SAMPLES TYPICAL = 1.1µV/C 0 -100 -200 A 100 909mW 0.8 8 /W SO 0°C 1 =1 0.6 435mW 0.4 θJ SO A =2 T2 3 30 0.2 °C -6 /W -300 -400 -60 0 -40 -20 0 20 40 60 80 100 120 0 25 50 75 85 100 125 150 AMBIENT TEMPERATURE (°C) TEMPERATURE (°C) FIGURE 14. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE FIGURE 13. SOIC VOS vs TEMPERATURE (VS = 5V) 0.7 JEDEC JESD51-3 LOW EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 0.6 625mW A 0.5 8 /W SO 0°C 6 =1 θJ POWER DISSIPATION (W) VOS (µV) 200 JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD θJ POWER DISSIPATION (W) 400 0.4 391mW θ 0.3 SO JA = 0.2 25 T2 3-6 6° C/ W 0.1 0 0 25 50 75 85 100 125 150 AMBIENT TEMPERATURE (°C) FIGURE 15. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE 5 FN7467.1 August 25, 2005 EL8188 Applications Information Typical Applications Introduction The EL8188 is a rail-to-rail input and output micro-power 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. V+ + EL8188 V- GENERAL PURPOSE COMBINATION pH PROBE + COAX 3V FIGURE 16. PH PROBE AMPLIFIER Rail-to-Rail Input The single PFET input stage of the EL8188 has an input common-mode voltage range that goes from negative supply to positive supply without introducing offset errors or degrading performance associated with a conventional railto-rail input operational amplifier. Many rail-to-rail input stages use dual 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 EL8188 achieves input rail-to-rail performance without sacrificing important precision specifications and without degrading distortion performance. The EL8188's input offset voltage exhibits a smooth behavior throughout the entire common-mode input range. A general-purpose combination pH probe has extremely high output impedance typically in the range of 10GΩ to12GΩ. 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 EL8188 and a low-cost coax cable. The EL8188 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 100kΩ R3 10kΩ R2 K TYPE THERMOCOUPLE 10kΩ V+ + EL8188 V- 410µV/°C + 5V 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 EL8188 with a 100kΩ load will swing to within 3mV of the supply rails. Enable/Disable Feature The EL8188 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 3µA, 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 EL8188’s to be connected together as a MUX. The outputs are tied together in parallel and a channel can be selected by the EN pin. 6 R1 100kΩ FIGURE 17. THERMOCOUPLE AMPLIFIER Thermocouples are the most popular temperature-sensing device because of their low cost, interchangeability, and ability to measure a wide range of temperatures. The EL8188 is used to convert the differential thermocouple voltage into single-ended signal with 10X gain. The EL8188's rail-to-rail input characteristic allows the thermocouple to be biased at ground and the converter to run from a single 5V supply. FN7467.1 August 25, 2005 EL8188 SO Package Outline Drawing 7 FN7467.1 August 25, 2005 EL8188 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 FN7467.1 August 25, 2005