Data Sheet September 2006 FN6339.0 Dual Micropower Single Supply
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ISL28288
Data Sheet September 2006 FN6339.0
Dual Micropower Single Supply Rail-to-Rail Input Output (RRIO) Precision Op-Amp
ISL28288 dual channel micropower precision operational amplifier optimized single supply operation operate down 2.4V. equivalent performance single channel op-amp reference EL8188. ISL28288 features Input Range Enhancement Circuit (IREC) which enables ISL28288 maintain CMRR performance input voltages equal positive negative supply rails. input signal capable swinging above positive supply rail 100mV below negative supply with only slight degradation CMRR performance. output operation rail rail. ISL28288 draws minimal supply current while meeting excellent DC-accuracy, AC-performance, noise output drive specifications. ISL28288 operated from lithium cell Ni-Cd batteries. input range includes both positive negative rail.
Features
power 120µA supply current both channels 1.5mV offset voltage 30pA input bias current 300kHz gain-bandwidth product 100dB PSRR CMRR Single supply operation down 2.4V Input capable swinging above below V(ground sensing) Rail-to-rail input output (RRIO) Pb-free plus anneal available (RoHS compliant)
Applications
Battery- solar-powered systems 25mA current loops Handheld consumer products Medical devices Thermocouple amplifiers Photodiode pre-amps
Ordering Information
PART PART NUMBER MARKING ISL28288FUZ (See Note) 28288Z TAPE REEL 50/Tube PACKAGE PKG. DWG.
probe amplifiers
MSOP MDP0043 (Pb-free)
Pinout
ISL28288 MSOP) VIEW
IN+_A EN_A EN_B IN+_B IN-_A OUT_A OUT_B IN-_B
ISL28288FUZ-T7 28288Z (See Note)
MSOP MDP0043 (1500 pcs) (Pb-free)
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials 100% matte plate termination finish, which RoHS compliant compatible with both SnPb Pb-free soldering operations. Intersil Pb-free products classified Pb-free peak reflow temperatures that meet exceed Pb-free requirements IPC/JEDEC STD-020.
CAUTION: These devices sensitive electrostatic discharge; follow proper Handling Procedures. 1-888-INTERSIL 1-888-468-3774 Intersil (and design) registered trademark Intersil Americas Inc. Copyright Intersil Americas Inc. 2006. Rights Reserved other trademarks mentioned property their respective owners.
ISL28288
Absolute Maximum Ratings +25°C)
Supply Voltage 5.5V Supply Turn Voltage Slew Rate 1V/µs Differential Input Current Differential Input Voltage 0.5V Input Voltage 0.5V 0.5V tolerance, Human Body Model .3kV tolerance, Machine Model .300V Output Short-Circuit Duration .Indefinite Ambient Operating Temperature Range .-40°C +125°C Storage Temperature Range .-65°C +150°C Operating Junction Temperature +125°C
CAUTION: Stresses above those listed "Absolute Maximum Ratings" cause permanent damage device. This stress only rating operation device these other conditions above those indicated operational sections this specification implied. IMPORTANT NOTE: parameters having Min/Max specifications guaranteed. Typical values information purposes only. Unless otherwise noted, tests specified temperature pulsed tests, therefore:
Operating Junction
Electrical Specifications
2.5V, 1.4V, +25°C unless otherwise specified. Boldface limits apply over operating temperature range, -40°C +125°C, temperature data guaranteed characterization CONDITIONS -1.5
±0.05
PARAMETER -Time
DESCRIPTION Input Offset Voltage Long Term Input Offset Voltage Stability Input Offset Drift Temperature Input Offset Current
UNIT µV/Mo µV/°C
-600 Input Bias Current -40°C +85°C Input Noise Voltage Peak-to-Peak Input Noise Voltage Density CMIR CMRR PSRR AVOL Input Noise Current Density Input Voltage Range Common-Mode Rejection Ratio Power Supply Rejection Ratio Large Signal Voltage Gain 0.1Hz 10Hz 1kHz 1kHz Guaranteed CMRR test 2.4V 0.5V 4.5V, 100k 0.5V 4.5V, VOUT Maximum Output Voltage Swing Output low, 100k Output low, Output high, 100k Output high, Slew Rate Gain Bandwidth Product 4.990 4.97 4.800 4.750 0.12 0.09 4.996 4.880
±0.14
µVPP nV/Hz pA/Hz
V/mV V/mV
0.16 0.21
V/µs
FN6339.0 September 2006
ISL28288
Electrical Specifications
2.5V, 1.4V, +25°C unless otherwise specified. Boldface limits apply over operating temperature range, -40°C +125°C, temperature data guaranteed characterization (Continued) CONDITIONS channels enabled. channels disabled. -0.1 +0.1 UNIT
PARAMETER IS,ON IS,OFF ISC+ ISCVS VINH VINL IENH IENL
DESCRIPTION Supply Current, Enabled Supply Current, Disabled Short Circuit Sourcing Capability Short Circuit Sinking Capability Minimum Supply Voltage Enable High Level Enable Level Enable Input Current Enable Input Current
Typical Performance Curves
GAIN (dB) Vout 50mVp-p RF=0/RG 100k FREQUENCY (Hz) ±2.5V ±2.5V ±1.2V GAIN (dB) ±1.2V 100k ±2.5V ±1.2V
±1.0V
FREQUENCY (Hz)
100k
FIGURE FREQUENCY RESPONSE SUPPLY VOLTAGE
FIGURE FREQUENCY RESPONSE SUPPLY VOLTAGE
INPUT OFFSET VOLTAGE (µV) VDD/2 INPUT OFFSET VOLTAGE (µV) -100 OUTPUT VOLTAGE 2.5V
VOS,
-100 COMMON-MODE INPUT VOLTAGE
FIGURE INPUT OFFSET VOLTAGE OUTPUT VOLTAGE
FIGURE INPUT OFFSET VOLTAGE COMMON-MODE INPUT VOLTAGE
FN6339.0 September 2006
ISL28288 Typical Performance Curves
GAIN (dB) 100k FREQUENCY (Hz)
(Continued)
PHASE GAIN (dB) -120 PHASE GAIN -100 -150 PHASE
100k
FREQUENCY (Hz)
FIGURE AVOL FREQUENCY 100k LOAD
FIGURE AVOL FREQUENCY LOAD
TEMPERATURE (°C) -100 100k PSRR (dB) PSRR PSRR 5VDC VSOURCE 1Vp-p
CMRR (dB) -100 100k ±2.5VDC VSOURCE 1Vp-p
TEMPERATURE (°C)
FIGURE PSRR FREQUENCY
FIGURE CMRR FREQUENCY
2.56 2.54 2.52 VOUT VOLTS VOLTS 2.50 2.48 2.46 2.44 2.42 TIME (µs) 5VDC VOUT 0.1Vp-p
5VDC VOUT 2Vp-p VOUT
TIME (µs)
FIGURE SMALL SIGNAL TRANSIENT RESPONSE
FIGURE LARGE SIGNAL TRANSIENT RESPONSE
FN6339.0 September 2006
ISL28288 Typical Performance Curves
10.00 CURRENT NOISE (pA/Hz) VOLTAGE NOISE (nV/Hz)
(Continued)
1.00
0.10
0.01 100k FREQUENCY (Hz)
100k FREQUENCY (Hz)
FIGURE CURRENT NOISE FREQUENCY
FIGURE VOLTAGE NOISE FREQUENCY
VOLTAGE NOISE (1µV/DIV)
100K
VOLTS
100K
Function Generator 33140A
VOUT
5.4µVP-P
TIME (ms)
TIME (1s/DIV)
FIGURE 0.1Hz 10Hz INPUT VOLTAGE NOISE
FIGURE INPUT VOLTAGE SWING ABOVE SUPPLY
0.1V/DIV SUPPLY VOLTAGE VOUT 1V/DIV Input 200mVp-p
SUPPLY CURRENT (µA)
10µs/DIV
FIGURE SUPPLY CURRENT SUPPLY VOLTAGE
FIGURE ENABLE OUTPUT DELAY TIME
FN6339.0 September 2006
ISL28288 Typical Performance Curves
CURRENT (uA) MEDIAN CURRENT (uA) TEMPERATURE (°C) TEMPERATURE (°C) MEDIAN
(Continued)
FIGURE SUPPLY CURRENT TEMPERATURE ±2.5V ENABLED,
FIGURE SUPPLY CURRENT TEMPERATURE ±2.5V DISABLED,
CURRENT (pA) -200 -300 -400 -500 -600 -700 MEDIAN CURRENT (pA) -100
-100 -150 -200 -250 -300 TEMPERATURE (°C) -350 MEDIAN
TEMPERATURE (°C)
FIGURE BIAS(+) TEMPERATURE ±2.5V
FIGURE BIAS(-) TEMPERATURE ±2.5V
CURRENT (pA) -100 -150 -200 -250 -300 -350 MEDIAN
450.05 400.05 350.05 AVOL(V/mV) 300.05 250.05 200.05 150.05 100.05 50.05 TEMPERATURE (°C) 0.05
MEDIAN
TEMPERATURE (°C)
FIGURE INPUT OFFSET CURRENT TEMPERATURE ±2.5V
FIGURE AVOL TEMPERATURE =100k, +2V/-2V ±2.5V
FN6339.0 September 2006
ISL28288 Typical Performance Curves
VOLTAGE (µV) -200 MEDIAN -400 -600 -800 -1000 VOLTAGE (µV)
(Continued)
-200 -400 -600 -800 -1000 MEDIAN
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE INPUT OFFSET VOLTAGE TEMPERATURE ±2.5V
FIGURE INPUT OFFSET VOLTAGE TEMPERATURE ±1.2V
PSRR (dB) MEDIAN
MEDIAN
CMRR (dB)
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE CMRR TEMPERATURE, FREQ 0Hz, +2.5V -2.5V
FIGURE PSRR TEMPERATURE, FREQ 0Hz, ±1.2V ±2.5V
4.895 4.89 4.885 4.88 4.87 4.875
VOUT (mV)
MEDIAN
VOUT
4.865 MEDIAN 4.86 4.855 4.85 4.845 4.84 TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE POSITIVE VOUT TEMPERATURE ±2.5V
FIGURE NEGATIVE VOUT TEMPERATURE ±2.5V
FN6339.0 September 2006
ISL28288 Typical Performance Curves
4.9984 4.9982 4.998 4.9978 VOUT 4.9976 4.9974 4.9972 4.997 4.9968 4.9966 4.9964 TEMPERATURE (°C) MEDIAN VOUT (mV) TEMPERATURE (°C) MEDIAN
(Continued)
FIGURE POSITIVE VOUT TEMPERATURE 100k, ±2.5V
FIGURE NEGATIVE VOUT TEMPERATURE 100k, ±2.5V
14.5 CURRENT (nA)
0.85 CURRENT (µA) 0.75 0.65 0.55
13.5 12.5 11.5 MEDIAN
MEDIAN
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE (EN) TEMPERATURE ±2.5V
FIGURE (EN) TEMPERATURE ±2.5V
0.19 SLEW RATE (V/µs) 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.09 TEMPERATURE (°C) MEDIAN SLEW RATE (V/µs))
0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 TEMPERATURE (°C) MEDIAN
FIGURE +SLEW RATE TEMPERATURE ±2.5V, INPUT ±0.75V
FIGURE -SLEW RATE TEMPERATURE ±2.5V, INPUT ±0.75V
FN6339.0 September 2006
ISL28288 Typical Performance Curves
POWER DISSIPATION POWER DISSIPATION AMBIENT TEMPERATURE (°C) 893mW
(Continued)
JEDEC JESD51-3 EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD 633mW
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL CONDUCTIVITY TEST BOARD
AMBIENT TEMPERATURE (°C)
FIGURE PACKAGE POWER DISSIPATION AMBIENT TEMPERATURE
FIGURE PACKAGE POWER DISSIPATION AMBIENT TEMPERATURE
Descriptions
ISL28288 MSOP) NAME IN+_A EN_A VEN_B IN+_B IN-_B OUT_B OUT_A IN-_A EQUIVALENT CIRCUIT Circuit Circuit Circuit Circuit Circuit Circuit Circuit Circuit Circuit Circuit Amplifier non-inverting input Amplifier enable internal pull-down; Logic selects disabled state; Logic selects enabled state. Negative power supply Amplifier enable with internal pull-down; Logic selects disabled state; Logic selects enabled state. Amplifier non-inverting input Amplifier inverting input Amplifier output Positive power supply Amplifier output Amplifier inverting input
LOGIC VCIRCUIT CIRCUIT VVCIRCUIT
DESCRIPTION
CAPACITIVELY COUPLED CLAMP
CIRCUIT
FN6339.0 September 2006
ISL28288 Applications Information
Introduction
ISL28288 dual CMOS rail-to-rail input, output (RRIO) micropower precision operational amplifier with enable feature. part designed operate from single supply (2.4V 5.0V) dual supply (±1.2V ±2.5V) while drawing only 120µA supply current. device input common mode range that extends above positive rail 100mV below negative supply rail. output operation swing within about supply rails with 100k load (reference Figures through 30). This combination power precision performance makes this device suitable solar battery power applications.
Enable/Disable Feature
ISL28288 offers that disables device when pulled least 2.0V. disabled state (output high impedance state), part consumes typically 4µA. disabling part, multiple ISL28288 parts connected together MUX. this configuration, outputs tied together parallel channel selected pin. also internal pull down. left open, will pull negative rail device will enabled default. loading effects feedback resistors disabled amplifier must considered when multiple amplifier outputs connected together.
Using Only Channel
ISL28288 dual opamp. application only requires channel, user must configure unused channel prevent from oscillating. unused channel will oscillate input output pins floating. This will result higher than expected supply currents possible noise injection into channel being used. proper prevent this oscillation short output negative input ground positive input shown Figure 37).
ISL28288
Rail-to-Rail Input
input common-mode voltage range ISL28288 goes from negative supply greater than positive supply without introducing additional offset errors degrading performance associated with conventional railto-rail input operational amplifier. Many rail-to-rail input stages differential input pairs, long-tail PFET) NFET). Severe penalties have paid this circuit topology. input signal moves from supply rail another, operational amplifier switches from input pair other causing drastic changes input offset voltage undesired change magnitude polarity input offset current. ISL28288 achieves input rail-to-rail without sacrificing important precision specifications degrading distortion performance. devices' input offset voltage exhibits smooth behavior throughout entire common-mode input range. input bias current versus common-mode voltage range gives undistorted behavior from typically 100mV below negative rail higher than rail (0.5V higher than when equals 5V).
FIGURE PREVENTING OSCILLATIONS UNUSED CHANNELS
Proper Layout Maximizes Performance
achieve maximum performance high input impedance offset voltage ISL28288, care should taken circuit board layout. board surface must remain clean free moisture avoid leakage currents between adjacent traces. Surface coating circuit board will reduce surface moisture provide humidity barrier, reducing parasitic resistance board. When input leakage current concern, guard rings around amplifier inputs will further reduce leakage currents. Figure shows guard ring example unity gain amplifier that uses impedance amplifier output same voltage high impedance input eliminate surface leakage. guard ring does need specific width, should form continuous loop around both inputs. further reduction leakage
Input Protection
input terminals have internal protection diodes both positive negative supply rails, limiting input voltage within diode beyond supply rails. ISL28288 additional back-to-back diodes across input terminals. applications where input differential voltage expected exceed 0.5V, external series resistors must used ensure input currents never exceed 5mA.
Rail-to-Rail Output
pair complementary MOSFET devices used achieve rail-to-rail output swing. NMOS sinks current swing output negative direction. PMOS sources current swing output positive direction. ISL28288 with 100k load will swing within positive supply rail within negative supply rail.
FN6339.0 September 2006
ISL28288
currents, components mounted board using Teflon standoff insulators.
HIGH IMPEDANCE INPUT ISL28288
Current Limiting
ISL28288 internal current-limiting circuitry. output shorted, possible exceed Absolute Maximum Rating output current power dissipation, potentially resulting destruction device.
Power Dissipation
possible exceed +150°C maximum junction temperatures under certain load power-supply conditions. therefore important calculate maximum junction temperature (TJMAX) applications determine power supply voltages, load conditions, package type need modified remain safe operating area. These parameters related follows:
JMAX MAXTOTAL (EQ.
FIGURE GUARD RING EXAMPLE UNITY GAIN AMPLIFIER
Example Application
Thermocouples most popular temperature-sensing device because their cost, interchangeability, ability measure wide range temperatures. ISL28288 (Figure used convert differential thermocouple voltage into single-ended signal with gain. ISL28288's rail-to-rail input characteristic allows thermocouple biased ground amplifier from single supply.
100k TYPE THERMOCOUPLE ISL28288
where: PDMAXTOTAL maximum power dissipation each amplifier package (PDMAX) PDMAX each amplifier calculated follows:
OUTMAX SMAX OUTMAX
(EQ.
where:
410µV/°C
TMAX Maximum ambient temperature Thermal resistance package PDMAX Maximum power dissipation amplifier Supply voltage IMAX Maximum supply current amplifier VOUTMAX Maximum output voltage swing application Load resistance
100k
FIGURE THERMOCOUPLE AMPLIFIER
FN6339.0 September 2006
ISL28288 Mini Package Family (MSOP)
0.25 (N/2)+1
MDP0043
MINI PACKAGE FAMILY SYMBOL MSOP8 1.10 0.10 0.86 0.33 0.18 3.00 4.90 3.00 0.65 0.55 0.95 MSOP10 1.10 0.10 0.86 0.23 0.18 3.00 4.90 3.00 0.50 0.55 0.95 TOLERANCE Max. ±0.05 ±0.09 +0.07/-0.08 ±0.05 ±0.10 ±0.15 ±0.10 Basic ±0.15 Basic Reference NOTES Rev. 6/99
I.D.
(N/2)
SEATING PLANE 0.10 LEADS
0.08
NOTES: Plastic metal protrusions 0.15mm maximum side included. Plastic interlead protrusions 0.25mm maximum side included. Dimensions "E1" measured Datum Plane "H".
DETAIL
Dimensioning tolerancing ASME Y14.5M-1994.
GAUGE PLANE DETAIL
0.25
Intersil U.S. products manufactured, assembled tested utilizing ISO9000 quality systems. Intersil Corporation's quality certifications viewed www.intersil.com/design/quality
Intersil products sold description only. Intersil Corporation reserves right make changes circuit design, software and/or specifications time without notice. Accordingly, reader cautioned verify that data sheets current before placing orders. Information furnished Intersil believed accurate reliable. However, responsibility assumed Intersil subsidiaries use; infringements patents other rights third parties which result from use. license granted implication otherwise under patent patent rights Intersil subsidiaries.
information regarding Intersil Corporation products, www.intersil.com
FN6339.0 September 2006
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